How do isochronic tones work

Isochronic Tones – How They Work, the Benefits and the Research

Isochronic tones are a fast and effective audio-based way to stimulate your brain.  Among many of the benefits, they can help improve focus, relaxation, energy levels, sleep and more, without taking drugs or needing any special equipment.

What isochronic tones essentially do, is guide your dominant brainwave activity to a different frequency while you are listening to them, allowing you to influence and change your mental state and how you feel.

The effects can be felt within a few minutes and all you literally have to do is click play and listen.

What You Need to Know About Isochronic Tones

You may have heard of binaural beats which are similar, but an older method of stimulating your brain.  In this in-depth article you will discover:

  • The key benefits of isochronic tones and how they work
  • How isochronic tones are different and more effective than binaural beats
  • How different tone/beat frequencies affect your mental state and the way you feel
  • What frequencies do what, and what to look out for
  • Are isochronic tones as effective when combined with music?
  • How to use isochronic tones effectively and how long the effects last for
  • Any potential safety concerns or side effects
  • Isochronic tones and binaural beats research and where to find it


How Do You Use Isochronic Tones and What Are The Benefits?

Isochronic tones can be used in many different ways for multiple benefits.  When I first discovered them around 2006 their most popular use was for meditation and relaxation.  While they are still very popular for meditation, an increasing number of people are using them to help with studying, to improve focus and concentration in particular.

The main concept behind isochronic tones and brainwave entrainment methods in general is the ability to change your dominant brainwave frequency and guide your brain to a preferred or optimum mental state.

Stress or Anxiety Relief – When you are feeling stressed, agitated, anxious or angry your brain will usually be producing an increased amount of high beta activity.  Low beta or alpha frequency isochronic tones will help to lower your dominant frequency, reducing feelings of stress or anxiety.

Meditation and Relaxation – Sometimes it can be hard to really relax properly, and it can be even more difficult to reach a deeper state of meditation, especially for those new to meditation.  Using low alpha and theta frequencies will help guide your brain to these deeply relaxing and sometimes enlightening mental states.

Increase Focus, Cognition and Memory – When it's time to study or work, our brain isn't always firing on all cylinders and ready to focus.  If you are feeling tired, unmotivated and distracted, isochronic tones in the beta range will elevate your brainwaves up to a more optimal high focused state, and keep your mind there for the duration.

Research has shown that Alpha stimulation can also be helpful in improving your ability to memorize and retain information.  So it has become very popular among students, who listen to it while revising and memorizing information for tests and exams.

Improving Sleep and for Power Napping – When you're struggling to get to sleep, it's very likely that your brain is producing too much beta activity.  Brainwave entrainment tones can be used to reduce beta activity and increase more in the low delta frequency range.  Helping you get to sleep faster.

Energy and Motivation – Increasing the amount of higher beta and gamma brainwave activity can help boost your energy levels, and make you feel more alert.  It's a great chemical-free alternative to caffeine and energy drinks.

What are Isochronic Tones and What Do They Look and Sound Like?

Isochronic tones are consistent regular beats of a single tone.  To explain it in the simplest of terms, an isochronic tone is a tone being switched on and off very quickly.

The speed at which the tone is switched on and off is measured in terms of Hertz (Hz).   The image below shows the waveform of a 10Hz isochronic tone.

Example 10Hz Isochronic Tone

10Hz isochronic tone

10Hz isochronic tone – 10 beats per second

1 Minute demo of a 10Hz isochronic tone:

 10Hz tones

The example above shows a 1-second snapshot of a 10Hz isochronic tone.  If you count the waveforms you'll see they are repeated 10 times over this 1 second time period.

How Do Isochronic Tones Work and Affect Your Brain?

Isochronic tones utilize a process known as brainwave entrainment, which can influence and drive brainwave activity to a more desired mental state.  Entrainment occurs when the brainwave frequency starts to replicate that of the stimulus.  With isochronic tones, the stimulus is in the form of a clear and repetitive beat/tone.

The distinct and repetitive beat of isochronic tones produce what's known as an evoked potential, or evoked response in the brain.   This is an electrical potential recorded from the nervous system, following the presentation of a stimulus.  These electrical potentials can be seen and recorded using an Electroencephalograph (EEG).

Brainwave Synchronization

The process of brainwave entrainment relies on the natural phenomena of synchronization.  Entrainment is defined as a ‘synchronization of two or more rhythmic cycles’ and you may already have seen or experienced it yourself, without knowing what was going on.

Here a few examples of natural synchronization:

Tuning forks – When you strike a tuning fork and then place another one next to it, the second tuning fork will automatically start to vibrate at the same frequency.

Pendulum clocks and metronomes – If you placed a number of pendulum clocks or metronomes in close proximity to each other, and set them all off swinging at different times, within a few minutes they will all start to swing together in unison.

Menstrual Cycles – It’s often found that when a group of women live in the same house together, their menstrual cycles will start to sync together. In college dorms, it’s regularly found that all the women on the same floor will have their periods at the same time.

Fireflies – If you are ever lucky enough to witness fireflies in action, you will notice that as the night wears on they will start to flash in unison.

Brainwave Activity – The frequency of your brainwave electrical pulses can be stimulated and influenced, by repetitive light flashing or sound rhythms and become synchronized to the same frequency of the light flashing or sound rhythms.

Frequency Following Response

When brainwaves become entrained and synchronized with the same frequency of an isochronic beat, this is known as frequency following response (FFR).   The frequency of the stimulus/beats can then be changed and your dominant brainwave frequency follows along in step with it.

By using the power of FFR, your brainwave activity can be guided to a more optimum frequency, to enhance or improve your mental states.

For example, when you are very stressed or anxious, your brain will usually be producing an elevated amount of the higher beta brainwave activity.  By stimulating your brain with lower alpha frequencies you can reduce the frequency of your dominant brainwave activity, helping to calm your mind and reduce the feeling of stress.

Isochronic tones versus binaural beats

Isochronic Tones vs Binaural Beats

The discovery of binaural beats can be traced back to 1839, by German scientist Heinrich Wilhelm Dove.  Whereas isochronic tones is a much newer discovery, with the first study being published by Arturo Manns in 1981, which showed that isochronic tones produce a much stronger brainwave entrainment effect, compared to binaural beats.

Because binaural beats were discovered first and have been around for so long, many people incorrectly label isochronic tones as a type of binaural beat.  In actual fact they are both just different methods of audio brainwave stimulation.

Isochronic Tones

  • They produce a more distinct tone/beat, which results in a stronger ‘cortical evoked response' in the brain, making the stimulation more effective.
  • Standard sessions/tracks don't require headphones.
  • With advanced sessions that require headphones, you have the ability to stimulate each side of the brain with a different frequency of beat, allowing you to lower or increase the activity in one side of the brain.

Binaural Beats

  • You always need headphones to hear Binaural Beats tracks effectively.
  • Produces a very shallow waveform which can be more pleasant to listen to, but it only produces a very small ‘cortical evoked response' in the brain.
  • Not effective in the higher beta and gamma range frequencies
  • You can't target a specific side of the brain, just the whole brain.

How Do Binaural Beats Work?

A binaural beat is created by sending tones of a slightly different frequency into each ear, which results in the listener hearing a ‘perceived' beat at the frequency equal to the difference between the two tone frequencies.  To put that more simply, here's an example:

A tone of 200Hz is sent to the left ear

A tone of 210Hz is sent to the right ear

The difference between both frequencies is 10Hz, so the listener perceives a tone beating at a rate of 10 times per second, i.e. 10Hz.

Again using the above example, if the second tone in the right ear was increased to 220Hz, the difference would be 20Hz, so a 20Hz beat would be heard.

Why are Binaural Beats ‘Perceived' and Not Just Heard Like Normal Beats?

Good question.  With binaural beats, the resulting beat you hear is a type of auditory illusion, created and heard inside your head.  No actual beat is sent into your ears, just two plain tones at different frequencies.  The brain recognises that the tones are different in each ear and somehow produces a resulting beat after processing them.

10Hz binaural beat waveform

A 10Hz binaural beat waveform before it goes inside your head

Looking at the snapshot above there isn't a visible beat, just 2 continuous waveforms for each left and right channel/ear.  After the 2 tones are sent to each ear and heard inside your brain, a binaural beat waveform will look something like this:

A 1-minute demo of a 10Hz binaural beat:

10Hz binaural beat


Example waveform of what a binaural beat would look like inside your head – Image credit: DPic via

As you can see from the diagram above the depth of the waveform is very shallow, especially when compared to the very clear and distinct space in between each isochronic beat.

In a research article by David Siever 2009, Entraining Tones and Binaural Beats, Siever noted that the modulation depth (the difference between loud and quiet) is very small at just 3db, a 2 to 1 ratio.  Compared to isochronic tones that easily produce 50db, which is a 100,000 to 1 ratio.

In layman's terms, this means that isochronic tones produce a much more pronounced and distinct sounding beat.  When measured on an EEG, binaural beats only produce a small response in the brain, and little to no impact on brainwave driving.  So for brainwave entrainment purposes, isochronic tones are more effective and superior.

This is why I always use isochronic tones on all my brainwave entrainment tracks and no longer use binaural beats.

How to use isochronic tones

How to use Isochronic Tones

The most common way to use Isochronic Tones is for a short-term benefit.  They provide a chemical-free alternative to things like coffee, energy drinks, alcohol, pills and other forms of medication.   The key word here is ‘alternative'.  They are not meant to replace any prescribed medication by a Doctor or medical professional.

How Long Do the Effects From Isochronic Tones Last For?

The most common way to use a brainwave entrainment is for a short-term benefit, to help guide your brain into a particular mental state at the time you need it.  In a similar way to how you might take a sleeping pill before bed to help you get to sleep, or maybe drink some coffee or an energy drink to help wake you up and give you a boost of energy.

The effects are strongest while you are listening to the tones because your brainwaves are synchronized and tuned into the frequency range you desire at that time.  After you've stopped listening the effects can still linger for a while afterwards.  The timescale will vary from person to person and be affected by what you do after you've stopped listening.

As an example, if you use a mediation session to deeply relax you, you might stay feeling chilled out for a few hours afterwards.  But if you jump on a roller-coaster after listening, your brainwaves are going explode with beta and gamma activity from the adrenalin rush.

Some research suggests that the benefits from brainwave entrainment can last a lot longer, and still be seen for some time after you've stopped using it.  Study participants have still maintained improved test scores a few weeks after the stimulation had ceased.  Research on the long-term benefits has so far been minimal though, so how long the effects last is still up for debate.

The Importance of Being Hydrated

It's important to make sure you are well hydrated before listening to Isochronic Tones, especially when using the higher Beta and Gamma frequency tracks.  Around 75% of the brain consists of water, and you need to keep it hydrated to function well, especially when you are doing things that require a higher level of concentration.

Headphones are Not Required for ‘Standard' Isochronic Tones Tracks

One of the main promoted benefits of using isochronic tones compared to binaural beats is that you don't need to use headphones.  That said, using headphones can help to intensify the effect of an isochronic tones track, and the over-ear type can be very useful for blocking out external noises and distractions.

You will notice with some of my isochronic tones tracks that I say you need headphones.  This is required on the more advanced sessions, where a different ‘frequency of beat' is sent to each ear.

What's the Best Volume Level to Listen to Them?

There isn't an actual ‘peak volume' level I can recommend for everyone because you'll notice the beats will sound different depending on the equipment you use.

With many portable devices like laptops, mobile/cell phones and tablets etc. they don't produce a lot of bass, so it can be hard to hear the tones on them and the volume often needs to be fairly high.  If you listen with headphones on, you'll often find you can have the volume a lot lower for the tones to be effective.

My best advice is to start off with the volume around half way and adjust it up or down from there to suit your preference.  You'll want the volume loud enough to hear the tones quite clearly, but never so loud that it hurts your ears.

Increasing the volume level can have some impact on the power of the tones.  So sometimes if you find a track not having a strong effect on you, try increasing the volume a little bit, or try using headphones if you haven't done so before.

Are Isochronic Tones as Effective When Combined with Music?

For many people, isochronic tones can sound quite harsh to listen to on their own, especially when you are first getting used to the sound.  To help improve the sound, they can be combined with music or ambient nature sounds, which is the most common way people listen to them.

A popular opinion in the brainwave entrainment community is that listening to isochronic tones without music produces a much stronger effect.  However, in the study by Doherty, Cormac. “A comparison of alpha brainwave entrainment, with and without musical accompaniment” (2014),  it was concluded that brainwave entrainment was equally effective for isochronic tones, both with and without music.

Music Can Enhance the Experience

If you combine the right soundtrack with isochronic tones, it can have a positive effect on your mood and how well you receive the stimulation from the tones.

Music taste varies from person to person, and as individuals, our mood and situation will often dictate a preference for different styles of music.

This can have some impact on how effective isochronic tones can be.  If you dislike a particular music genre, you are going to find it hard to sit through and respond to a track, which contains that type of music.  No matter how effective and useful you believe the isochronic tones are going to be.

Likewise, if you like a particular music genre, it's going to make you feel more comfortable and relaxed, and put you in a better and more receptive mental state.

This is one of the key reasons why I provide a wide variety of different soundtracks with each of my products.  So you can pick and choose which soundtrack suits your preference and mood.

Varying the Soundtrack You Use Can Help Prevent Habituation

One of the potential drawbacks with brainwave entrainment is that over time your brain can start to get used to the stimulation and it can become less effective.  This is referred to as habituation.

Habituation is a common issue in many areas of our life, and it's one of the reasons people have to switch long-term medication sometimes, as their brain and body becomes less sensitive to the same stimulus over time.

There are a few different ways to help prevent and overcome the problem of habituation.

  • One way would be to not listen to the exact same track all the time, over and over, by mixing up your playlist with different isochronic tones sessions.
  • Make slightly different versions of the same session, by varying the pitch or beat frequency of the tones, or both.
  • Even listening to different volume levels can help in a small way.
  • Mix different music tracks with the tones.

Note: with all of the isochronic tones products I sell, I provide a ‘just tones‘ version, along with 6 alternative background sounds.  This gives you plenty of variety so you don't get bored, but it also gives you the ability to change things up and help prevent habitation when you listen to the same isochronic tones session regularly.

Why ‘Some' Advanced Isochronic Tones Tracks Require Headphones

Isochronic tones split hemisphere stimulation

In most cases, standard isochronic tones tracks don't require headphones to be effective.

However, some isochronic tones tracks use what's known as ‘split-hemisphere' stimulation, to help influence a specific side of the brain.  In order to do that each ear needs to be isolated and stimulated with a different frequency of ‘beat'.  Hence the need for headphones.

Before I get into that and how it works, I should explain a little bit about why you would want to target and stimulate a specific side of your brain, and some of the benefits in doing that.

The Left or Right Brained Myth Explained

There is a well-known myth where people are believed to be predominantly left or right brained.  In a 2013 study by Utah University neuroscientists that theory was debunked, and it was proven that we use both sides of the brain equally.

However, although we don't favour or mainly use a particular side of the brain in general, it’s absolutely true that some brain functions occur in one or the other side of the brain, or that certain brain functions result in much higher activity on one side, compared to the other.

Quoted from Wikipedia:

The lateralization of brain function refers to how some neural functions, or cognitive processes tend to be more dominant in one hemisphere than the other.

To give you an example in layman's terms,  while we are being creative our right brain is probably showing the most activity because that's where most people's brain processes creative functioning.  Likewise, most people tend to process language using their left brain.

Example Isochronic Tone for Split Hemisphere Stimulation

Split hemisphere isochronic tones

Isochronic tones with split-hemisphere stimulation. 10Hz on the left channel, 20Hz on the right

1 Minute demo of a split-hemisphere isochronic tone, 10Hz left ear, 20Hz right ear:

 Split hemisphere tones example

The picture above shows an example of an isochronic tones track used for split-hemisphere stimulation, where a different speed of beat is sent to each channel.  In this case, the left channel/ear will receive a 10Hz beat and the right channel/ear a 20Hz beat.

To hear the difference in beat speed use headphones and flip each side on an off your ear to compare the difference.

These split-hemisphere isochronic tones tracks use a more advanced method of stimulation.  Each ear/channel is stimulated with a different speed of beat.  This enables you to target a specific side of the brain and increase or decrease the brainwave frequency on that side compared to the other.

The brain works in a cross-wired way, with the left brain controlling the right side of the body, and the right brain controls the left.  Brainwave stimulation works in a similar way.

Although a beat sent to one ear will produce a reaction in both sides of the brain, EEG researchers have noticed that the first and strongest response, is seen in the opposite side of the brain.

So using the example track above, the right ear is sent a 20Hz beat, compared to a 10Hz beat in the left ear.  As the right ear receives the higher frequency of beat, this works to increase the speed of the ‘left' brain hemisphere, which can be helpful for people with conditions like ADD, who are often found to have an abundance of slow wave activity in the left brain.

Some of the Benefits of Using Split Hemisphere Isochronic Tones

One of the most notable and common uses of split-hemisphere stimulation is for ADD/ADHD.  People with ADD/ADHD are usually found to have an overabundance of slow wave brain activity, particularly in the left frontal region.


With my Cognition Enhancer and ADD/ADHD Intense Relief tracks, the left brain is stimulated with a higher frequency of beat, to help address this imbalance by increasing the frequency of the activity on that side of the brain.

Performance Anxiety

It's also common for people to experience a hemispheric imbalance before an anxiety-producing event, like a test or public speaking.   With my Public Speaking Anxiety product (which is also useful for pre-test/exam anxiety), the left brain is stimulated with a slightly higher frequency.

About brainwave frequencies for binaural beats and isochronic tones

About Brainwave Frequencies

Brainwave frequencies are generally categorized into 5 states.  Each state reflects a range of frequencies which are associated with it.

Brainwave speed is measured in Hertz (Hz) and relates to how many times they cycle per second.  A 5Hz brainwave simply means that it is cycling at a rate of 5 times per second.

Dominant Brainwave Frequency

If you were hooked up to an EEG, you would notice that your brain is constantly producing brainwaves across the whole spectrum.  So even when you are deeply asleep, your brain will still be producing some of the faster beta frequency brainwaves, but your dominant brainwave activity will be in the much lower delta range.

Our brainwave activity reflects how we are feeling and what we are doing.  If slower brainwaves are dominant we can feel tired, sleepy, very relaxed or dreamy.  If faster, higher frequency brainwaves are dominant, we can feel more alert, energized or highly focused.

With brainwave entrainment methods like isochronic tones, they are used to stimulate and produce more brainwave activity of a specific frequency or range, making that more dominant.   If you were very stressed for example, your dominant brainwave frequency would probably be very high.

In that situation, you could seek to reduce that by listening to slower speed isochronic tones, which would help calm your mind and bring down your stress levels.

Delta Waves

0.5Hz-4Hz – Delta waves are very slow and low in frequency.  You produce the most delta activity during your deepest sleep.  It's during delta that your body does most of it's healing and regenerating of cells.

Theta Waves

4Hz to 8Hz – Theta waves are also mainly dominant during sleep, or in a state of deep relaxation or when we are drifting in and out of sleep.

Theta brainwave frequencies research

Alpha Waves

8Hz to 12Hz – When in an alpha state we are usually very relaxed, calm and resting.  Increasing alpha waves can help us reduce stress and anxiety.  It's also a mental state where we can stimulate creativity, visualize and improve our ability to absorb and commit information to memory.

Alpha brainwave frequencies research

Beta Waves

12Hz to 40Hz – Beta is a faster and more dominant when we are consciously awake during the day.  We are in beta when we are focused, energized and alert.

Beta brainwave frequencies research

Gamma Waves

40Hz+ – Gamma is the fastest in the brainwave range.  It has been connected to mental states of high focus, cognitive enhancement and information processing.

isochronic tones research and resources

Isochronic Tones and Brainwave Entrainment Research Resources

There have been numerous studies into brainwave entrainment, isochronic tones and binaural beats over the years and you can find some of this research by searching with Google's Scholar search engine.

The following places are the best and most useful brainwave entrainment research resources:

Transparent Corp's Research Area is arguably the most comprehensive resource for collated brainwave entrainment research.   Update: the main research area on Transparent Corp's website is currently being updated, so it is offline.  However, you can still access their peer-reviewed research paper as a PDF here: “A Comprehensive Review of the Psychological Effects of Brainwave Entrainment“.

The Transparent Corp forum – This forum is an invaluable resource for any brainwave entrainment user or enthusiast.  Most of the feedback is obviously focused on the Transparent Corp software, but with over 20,000+ posts now you can find answers to the whole array of brainwave entrainment questions on there.  (UPDATE: Sadly, the Transparent Corp forum has now been taken offline)

The forum has a lot of experienced brainwave entrainment users as well as newbies, so it's a great place to post questions about the technology.

The Neuro-Programmer software help menu – The Neuro-Programmer software has long been the most popular and widely used software for creating isochronic tones, binaural and monaural beats, as well as photic/light brainwave entrainment tracks.

You can download and use the full version of the software on a 2-week free trial, without filling out any forms.  Once installed you'll have access to the huge list of help files and tutorials.  Most of the content focuses on how to use the software with tutorials etc.

But alongside that, you'll get invaluable insight into how and why brainwave entrainment tracks are created the way they are, how they can help you. This is one of those great hidden resources you'd never know was there unless you've installed and used the software.

Mind Place is one of the market leaders in light and sound stimulation devices and equipment.  I own and recommend their flagship mind media system called the Kasina.

Mind Place has a very useful support area, which again, like Transparent Corp's, focuses mainly on using their own products.  But hidden beneath the surface are a number of useful brainwave entrainment research resources.

On their support articles page, you can download PDFs of Michael Hutchison's MegaBrain report.  Although it's a bit dated now, Michael's MegaBrain book was quite revolutionary when it came out in 1986, and it's an interesting read.

You'll also find a number of other downloadable PDFs relating to AVS (Audio Visual Stimulation) research and insight.

The Mind Place Forum is mainly focused on their Light and Sound Meditation Systems, but even if you don't have any of their products yet, it's a friendly and helpful place to check out and pick up BWE (brainwave entrainment) information.

Mind Alive is a site run by David Siever, one of the pioneers in the brainwave entrainment industry.  They focus on selling light and sound machines and don't supply individual audio tracks.  They have a comprehensive brainwave entrainment research area, where they detail the various studies which they have conducted and have been involved with.

Are Isochronic Tones Safe to Use?

Isochronic tones and binaural beats are deemed as a safe technology to use.  You may come across a few precautionary warning online, but I have yet to find any actual research studies showing that isochronic tones can be problematic for any particular medical condition.

Do isochronic tones cause seizures?

The most common precautionary warning you may find regarding isochronic tones is for people who are epileptic or prone to seizures.   The warning originated regarding the use of photic brainwave entrainment stimulation (which uses flashing light), not because of audio stimulation.

To quote David Seiver again (one of the pioneers in brainwave entrainment  research from

Auditory entrainment (AE) is a safe alternative for people who have a history of seizures or believe that they might be susceptible to seizures using photic entrainment.

Although I'm not aware of any scientific research suggesting isochronic tones can cause a seizure, if you are someone who is prone to them or in a group at risk of them and you are concerned about it, I recommend that you consult a doctor or medical professional before using them, just to put your mind at rest.

80 replies
  1. Avatar
    Narinder Singh says:

    Hi. This article contains a lot of information about brainwave entertainment. Thanks. I have a question. I downloaded an Android app that plays isochronic tones. I like to use an Isochronic tone at 2.5Hz that is in Delta range and is supposed to help me get a deep and dreamless sleep. I use it without headphones and just keep the smartphone next to my pillow. But I do not know if I should keep the tone playing all the time while I sleep or put it on timer to shut off after some specified time. A custom timer is possible with the app. Can you please guide me.

    • Avatar
      Jason Lewis says:

      To get a full answer you should really get in touch with the owner of the app, because it does really depend on how their track is constructed and how they intend it to work. I have one 50-minute sleep track which takes you down into delta ( and that is designed to just get you to sleep, so you just let play until the end. If you played that track on repeat it might make you jump and wake you up, as the track begins at a higher frequency. I have another 8-hour sleep track which is meant to be played all throughout the night ( So it does depend on the individual track you are using.

      • Avatar
        Marko says:

        Hi, a quick question here. In this video (link removed)

        it says the following: “Running a delta sleep session throughout the night is not recommended as it can interrupt the normal sleep cycle”. I’ve been looping pure delta isochronic tones for about 5 days now, and have had quality sleep. Should I continue looping delta or should I let the videos play out without looping them? Will it will harm my health to do loop delta while I sleep?

        • Avatar
          Jason Lewis says:

          Hi Marko, that isn’t one of my videos you referred to, so I can’t really answer you properly as I don’t know how their track was created. For the best answer, you should really contact the video creator. There isn’t any research that I’ve seen to suggest that you could harm your health by looping a delta track. During a typical sleep cycle, your brainwave activity will usually go up and down between the delta and theta range. It may be that you won’t experience the same quality of sleep if you spend most of your time producing mainly delta activity. With my 8-hour sleep track, I fluctuate the frequency range to try and emulate a typical sleep cycle

  2. Avatar
    greg says:

    Quick question,
    I heard in a couple of places that isotonic waves are not effective in the Delta state. Is this true?

    • Avatar
      Jason Lewis says:

      Isochronic tones work just the same in delta as they do in alpha, theta and beta and they are widely used in the brainwave entrainment community to help people sleep. Like you, I’ve also seen some websites saying they don’t work in delta, but it’s a bit like the game of Chinese Whispers, where someone makes a comment and then after it gets passed around and shared a lot the message gets distorted and appears to be a fact. I don’t know of any scientific reason why they wouldn’t work in delta. I remember some people talking about this on a brainwave entrainment forum many years ago. They were saying they found isochronic tones a bit too abrupt for using to help them sleep and they preferred binaural beats, as they thought they were a more soothing sound. That was just a personal preference shared by a couple of prominent forum members at the time and some people then took that as a fact for everyone. That’s where I think that belief originated from.

  3. Avatar
    Justin says:

    Hi Jason,

    I’m new to Isochronic tone brainwave entrainment, but not to brainwave entrainment in general. When using Iscochronic tone beats, does it matter the frequency of sound used?

    Potentially speaking, if one wants to entrain to say gamma or hyper gamma, where you flash a sound 100 times in a second–would it increase the effectiveness at all, to use a 100 Hertz sound frequency to do the beat?

    Also, don’t you think that the inherent hemispheric synchronization using binaural beats might be a positive benefit within itself? While it’s true that the huge majority of us use both sides of our brains most of the time, it’s also true that many of us are a bit polarized to one side or the other in general, or when doing a particular kind of activity or focus. I’ve found stimulating a more equally and consistently whole brain activity has it’s own benefits other than the entrainment aspect.

    Do you think that Isochronic tones and binaural beats could be combined to get the best of both worlds?

    Thanks for any feedback

    • Avatar
      Jason Lewis says:

      From a brainwave entrainment effectiveness perspective, it’s my understanding that the response from isochronic tones stimulation starts to diminish over 30Hz and that 40Hz is about the limit for using them. So from what I’ve read on the topic a 100Hz beat wouldn’t work, probably because it’s too fast for the brain to process and synchronise with it.

      Because of the way they are created, there may be a positive benefit from listening to binaural beats without considering the brainwave entrainment aspect, but I haven’t seen any research on that. I first discovered brainwave entrainment through binaural beats about 10 years ago now, but they didn’t do anything for me. So I’ve never been a regular user of them. I believe isochronic tones are a more effective way to produce hemispheric synchronisation because they produce a much stronger response in the brain

      The brain will entrain to the strongest stimulus. If you combine binaural beats with isochronic tones, your brainwaves will entrain to the isochronic tones. If anything, when you combine the two I believe it makes the track less effective because it makes it harder for the brain to decipher between the two and synchronise to a single beat. There are lots of websites with compelling marketing about the benefits of combining the two together in some funky way, but I haven’t seen any research or lots of anecdotal feedback even to suggest it’s effective to combine them.

  4. Avatar
    Henry says:

    Really great stuff here, man. Well done! Without taking anything away from the article it would have been great to have under one “roof” similar information about hypnotherapy and subliminals. I invested quite a lot in buying binaural cd’s but after reading your material I think that for short term effects isochronic tones rather than binaurals are the technology to go for now. For longer lasting and possibly permanent effects I’m not sure whether I should go for hypnosis or subliminals (or both). An article as well written and comprehensive as yours but focusing on hypnosis vs subliminals would have completed the circle for me. The stuff I’ve read so far on binaurals vs isochronics hasn’t really done it for me. Any chance you could give it a shot?


    • Avatar
      Jason Lewis says:

      I appreciate your compliment on my article Henry. I’ve been using and reading up on isochronic tones and brainwave entrainment for many years, so it was just a case of trying to put a lot of what I’ve learnt into one article. I don’t have a great deal of knowledge or experience in using hypnosis and subliminals, so I’m afraid I wouldn’t be in a position to create something so extensive in reviewing them.

    • Avatar
      Iain says:

      Binaural beats do work – I’ve used Holysync CD’s for years & can vouch for their effectiveness; it’s just that the latest research seems to suggest that isochronic tones do it better. As it happens I am a skilled meditation [holding a diploma in meditation teacher training] & also have a diploma in Clinical Hypnotherapy. Both methodologies will take your brain into altered states that are known to be beneficial but not everyone takes readily to meditation and hypnotherapy is not cheap – so utilizing sound therapy which is known to be effective, makes good financial sense.

  5. Avatar
    Susanna Withers says:

    If anybody would like to look over the scientific evidence concerning brainwave entrainment and isochronic tones, I’ve done a lot of research over the years which I’ve collected at the PubMed website of NCBI – a branch of the National Institute of Health – that provides access to a large library of medical journal articles. I’ve made my list public so you can look through the journal articles that were published concerning this topic. Here’s the link: Most of the collection only gives access to abstracts or summaries unless you’re at some kind of educational institution that has a subscription to the particular journal that article is in, but I actually find abstracts really helpful. So have at it, read away. And if your psychiatrist/therapist thinks you’re nuts for feeling better after listening to isochronic tones, just whip out your 82-page collection of scientific journal abstracts written by her peers and give it to her to read. 🙂

  6. Avatar
    Alessandra says:

    Veey good article! I was sceptical and looking for scientific clarification, after reading this I am pretty prone to believe it works!
    Just one question: the web offers a wide variety of tracks, even to boost metabolism and burn fats. Do you think it could be effective? I’m unable to rely brain frequencies with metabolism speed…

    • Avatar
      Jason Lewis says:

      Thanks for your compliment on my article. 🙂 There are some frequency lists which reference and quote some links to metabolism, but I don’t know how effective or reliable that information is. One of the good things but also a drawback of this technology is how accessible it is to use and create tracks. That makes it unattractive for big companies to invest in large-scale research because it’s hard to patent and protect any product they produce based on the research. As soon as they released the frequency data, people like me would produce free videos and cheap MP3s to utilise the research, so they wouldn’t be able to get a good return on their research investment. So to try and gain some insight into what is working for people, at the moment, we are relying upon assessing anecdotal feedback in many areas. Before buying any products/tracks for increasing metabolism, I would look for and try out free videos on YouTube first, to try and gauge how those particular tracks and frequencies work for you.

    • Avatar
      Jason Lewis says:

      Generally speaking, the brain will usually entrain to the strongest stimulus which would be isochronic tones over binaural beats. So when you see people add binaural beats at a different frequency to the isochronic tones, that would not produce additional brainwave entrainment at another frequency. If they are both at the same frequency I haven’t seen any research to indicate whether that would be beneficial or not, but my belief is that it would weaken the potential for entrainment. When you look at the waveform of an isochronic tone there is a distinct empty space between each beat, making it very pronounced and effective. When you add binaural beats at the same frequency it looks like this: The depth of the waveform is now half as deep and less effective. This is before the binaural beats are formed inside your head, where the waveform is hard to determine and measure. From listening to that type of combination the beats sound much less pronounced, which has to make them much less effective in terms of a brainwave entrainment stimulus, compared to isochronic tones on their own.

  7. Avatar
    Sahil khokhar says:

    Quick question : There are a lot of videos on youtube on isochronic tones . I don’t know whether they are truly isochronic tones or not . So should I believe them and can listen them while studying. Please tell .

    • Avatar
      Jason Lewis says:

      Hi Sahil, it’s hard for me to speak about other people’s tracks and videos, as I don’t know how they created them either. If you’re interested in a particular track/video and unsure about it, try asking the creator a question or two about the track, what frequencies were used and for how long, what software they used etc. Then make your own judgement based on how they reply to you. Jason

  8. Avatar
    EJ says:

    Thanks for the article! Is there any upper limit for as to how many minutes a day you can expose yourself to these sessions? I study immensely, but I don’t want to wear my brain down, so to speak.

    • Avatar
      Jason Lewis says:

      Hi EJ, at the moment, there hasn’t been any research to give an indication of how long you should or shouldn’t listen for. Over time, I’ve seen people use my tracks for longer and longer. I started off providing 30-minute study tracks, but through demand, I extended them to 3-hours. I know from the many thousands of comments I’ve had on YouTube that a large number of people play those 3-hour tracks on repeat, or listen to different ones, one after the other throughout the day. I’ve also seen apps where you can play tracks like mine on continuous repeat. So it’s common for people to listen to them all day while they are studying.

      That all said, we are all different and have our own different limits. So I generally advise that you just be aware of how you are feeling, and if you feel like you are getting a bit fatigued from it, it’s probably time to stop or at least take a break. When listening over long extended periods, I recommend that you keep yourself well-hydrated. Your brain needs a good supply of water to function well, especially if you are studying hard and increasing your brainwave electrical activity.

  9. Avatar
    Carlos Maldonado says:

    Hi Jason, I just want to say THANK YOU for sharing this information, and specially for answering the questions so accurately, in one of them I found what was looking for: If isochronic tones work for generating Delta brainwaves.
    Thanks again and best regards.


      • Avatar
        Carlos Maldonado says:

        Actually, a question came across: For creating an isochronic tone in Audacity, you generate a tone and then apply the “IsoMod” effect to it, is it possible to do the same thing from white, pink or brownian noise, or from music instead of a tone and obtain good results?


        • Avatar
          Jason Lewis says:

          I’m afraid I’ve never heard or used the IsoMod effect in Audacity, so I don’t know how effective it would be for doing that, or how it works. I’ve been using Mind Workstation for 10 years and Neuroprogrammer for a few years before that. That’s all I’ve ever used to create isochronic tones.

          • Avatar
            Carlos Maldonado says:

            Gosh! Mind Work looks like the best choice to create isochronics, thanks for metioning it, and for sure I’m using it from now on. So, do you know if it is possible to use it to generate isochronic tones from the noises instead of a tone?. Thanks for being so patient.


          • Avatar
            Jason Lewis says:

            Isochronic tones are basically just a single tone with the volume being turned on and off at regular intervals. When you apply the same effects to music or a noise, it’s usually referred to as amplitude entrainment effects (in Mind Workstation anyway). When you apply the on/off effect to music or noise it’s usually done by targeting a specific frequency range in the sound and only turning that part on/off, leaving the rest of the music/noise untouched. What that does is allow parts of the music/noise to play without being distorted/interrupted, making it sound more pleasant to listen to. It produces a kind of fluttering sound as I like to call it and you can adjust the level of intensity.

  10. Avatar
    Josiah says:

    Do you personally utilize other methods such as lights or anything else to help with brain frequencies?

    How do you feel about using Isochronic Tones to help with Astral Projection and other OBE. Do you have an experience with Astral Projections?

    • Avatar
      Jason Lewis says:

      I have a Kasina from which uses light and sound stimulation, but I haven’t used it a great deal as light stimulation glasses aren’t helpful for how I mainly use this technology. I first discovered brainwave entrainment after looking for something to help me focus, and that’s always been the main thing I use isochronic tones for.

      I don’t have any experiences with astral projection or having an OBE, as I don’t personally spend time trying to achieve those kinds of mental states. If that’s something you want to try and pursue I would try using very low theta frequencies. You’d need to try and float around in the sweet spot where you are just hovering on the edge of sleep.

  11. Avatar
    Rona says:

    Hi Jason, thanks for all the uploads to youtube. I’ve been using them in work recently to help me concentrate and relax. I like the music tracks that you’ve chosen to overlay the tones. A couple of times in the last 2 weeks I’ve experienced the wavy pulse like sound, similar to the tones in my left ear. I wasn’t listening to tracks at the time or that day. It doesn’t last but it feels a bit strange. I wondered if I might have been listening to the tracks too loudly and that it was almost like a type of tinnitus. I’m curious to know if anyone has been in touch with you in the past to say they’ve had a similar experience?

    • Avatar
      Jason Lewis says:

      Hi Rona, thanks for your compliments on my videos and the music I use, I’m pleased you’ve found them helpful. Regarding the pulse-like sound you’ve been hearing, I’ve never had anyone report something similar to that before. I also haven’t heard anyone on brainwave entrainment forums mention it. That is very unusual and because I’ve never come across it before, I’m afraid I don’t know what would cause that.

      It may be that you had the volume too loud, but I would expect you to hear the effects of that straight after you’ve stopped listening, not on a day you haven’t used them. It might be something similar to muscle memory, where you suddenly remembered the sound and sensations it gives you as if you were hearing it again. I don’t know how long you’ve been using this type of thing for, but maybe it’s something that will settle down and disappear once you become more accustomed to the sound.

  12. Avatar
    Steve says:

    I enjoy this one called: Cognition Enhancer For Clearer and Faster Thinking – Isochronic Tones (Electronic) … I seem to enjoy it. Any harm in just listening to this one every day for 30 minutes as a routine daily thing, just like brushing your teeth and making your bed. I would just use it at times when I’m working at my desk, maybe even reading the online news etc…Thoughts?

    • Avatar
      Jason Lewis says:

      There isn’t any research or feedback I’ve had to suggest there’s any harm in doing that Steve. I’ve had people tell me they’ve been listening to that track for years. I also have a 3-hour extended version of that track as well, which lots of people say they use regularly every day while studying.

      • Avatar
        Lorita says:

        Finally someone who explained it so that the mere mortals can understand it. Thank you. You get isochronic tones on youtube for ie ant aging, fat loss, to attract people etc etc. Do you know if there is any truth to this? Thanks a mil for your insight into this.

        • Avatar
          Jason Lewis says:

          Thanks Lorita. There hasn’t been any isochronic tones research that I’m aware of, for anti-aging, fat loss or attracting people, or any significant anecdotal feedback. You could combine positive affirmations or hypnosis scripts with isochronic tones to try and change habits and that could help with fat loss or build confidence to attract people. But it would be the affirmations and hypnosis doing most of the work, the isochronic tones would just be used to help relax the listener and put them in a more suggestible state. I don’t believe isochronic tones can affect those things, without being used in combination with some kind of vocal mental programming.

          • Avatar
            Steve says:

            I do notice it says to be well hydrated before listening? Is it dangerous if you are dehydrated because I did go out for a bunch of red wine with friends and then listened the next day and I’m sure I was dehydrated before realizing it said to be hydrated?

  13. Avatar
    eugene says:

    Hi Jason,
    I have been using brain entrainment technology for several years, mostly to enhance my journey into the mind and all it has to offer (meditation, lucidology, sleep health, cognitive flexibility, memory , creative thinking, etc etc ) Currently , exploring gamma wave effects on myself.
    I admire your clarity and depth of understanding of this technology, and especially your sincere efforts to help others ..Thanks Jason..there should be more folks like you…it’ll be a far better world.
    I would appreciate your advice pertaining to my grandson…he’s 7 years old, diagnosed with autism spectrum disorder ( mild) with dominant symptoms of hyperactivity and low concentration. Do you recommend any application here to help him using brain entrainment

    • Avatar
      Jason Lewis says:

      Hi Eugene,

      Thanks for your appreciation of what I’m doing. I’ve been asked for help with autism a number of times over the years, so it’s something that I’ve often looked into and tried to find new information about. Unfortunately, I’ve yet to find any specific research relating to it and using the type of brainwave entrainment tones I use. There are a number of opinions and claims out here, but I’ve often found them to be conflicting. While some are recommending higher frequency gamma waves, others are recommending lower frequency alpha and theta waves while meditating.

      However, those with ASD are sometimes also diagnosed with ADHD. Although they are different conditions, some of the symptoms can be intertwined, which it appears may be the case with your grandson. So I would start by trying out my tracks for ADHD. You can try those out for free on my YouTube channel and I’ve put them together in a playlist here: The corresponding MP3 versions for those tracks can be found on my site here: I hope that helps.

  14. Avatar
    ET says:

    Hello Jason, this is an unusually thoughtful discussion. Thank you for all your expertise and your kind manner of presenting and moderating it. I’m wondering if you have any experience with this: ever since I’ve been exposed to theta wave music, without headphones, I have found it irritating. And this is in spite of the fact that when I was first handed a CD by someone I knew well and trusted he was so confident I’d love it It didn’t occur to either of us that I might not. This happened again recently, which is about 10 years later, when I heard it playing overhead at an acupuncture clinic. I felt restless and even irritated, unable to zone out, which is unusual for me, during the treatment. I realized that the quality of my irritation was similar to what I’d felt listening to that CD a decade ago.So I asked if it was theta wave music and she said yes. The acupuncturist said that some people, but a vast minority, really dislike the music. She said that the few people who dislike it are not simply neutral, but actively dislike it. And she also said, but most people like it a lot. I’m just wondering what kind of factors might be present that would make a person feel so irritated by this music?

    • Avatar
      Jason Lewis says:

      Hi Et, In all the feedback and studies I’ve read and looked into over the years, I’ve seen lots of feedback from people talking about how they don’t like the sound of the tones, or they find them irritating in some way. Unfortunately, there doesn’t seem to be any particular reason why one person likes it and the next doesn’t. It’s a bit like normal music, one person’s sweet symphony is another person pneumatic drill. It’s common for people to find it weird and maybe annoying at first, which is how I felt in the beginning. But usually after a few listens you can start to get used to it and appreciate the sound, and especially the feeling it gives you. Personally, I think it can help if you try to embrace the sound, psychologically speaking beforehand. It can also help to have the sound playing at a very low volume, to begin with, then building it up as you get more used to it.

      With regard to listening without headphones specifically, you might find it irritating if you are someone who suffers from motion sickness, depending on how the track is created. If you were listening to binaural beats, they really need headphones to work properly. If you are in a room and closer to one speaker you may not even hear binaural beats properly, and if sitting off centre in the room generally, that may have unsettled you if you have motion sickness as the tones try to form a beat in your head. If it was just a standard isochronic tones theta track that shouldn’t be irritating if you have motion sickness.

  15. Avatar
    chakra says:

    Good morning. I am not an English user, but I have a question with the help of a translator. Is the musical imagination of isochronic tones affecting the body or mind? Are the frequencies designed to reach specific cells safe? I stopped using it because I felt fatigue. The effect is also felt when the track is not in use. Is it tingling?

    • Avatar
      Jason Lewis says:

      Isochronic tones work by influencing your brainwave activity and they can’t directly affect the body. That said, the brain does control the body, so sensations and feelings can sometimes be felt in the body after stimulating your brainwave activity. Some people who are new listeners of this type of audio can sometimes feel tingling sensations in their body. Not everyone feels this and these sensations usually stop once you get more used to using the audios. Isochronic tones are considered as a safe technology. However, sometimes they can leave you feeling temporarily fatigued, especially if you listen to them for an extended period (hours) when you first start using them. If you felt fatigued, I would recommend using them for a much shorter period while you are getting used to them and ensure you are well-hydrated.

      • Avatar
        chakra says:

        Hi Jason, Thank you for your answer. I think isochronic tones are a safe technology. Many people use it safely. I use only stable frequency. Will not I have a recall tht effect if I stop using some frequencies? The hallucination frequency is said to cause flashback. I do not know about it and do not use it.

      • Avatar
        chakra says:

        I was careful about the frequency. Many people like frequency therapy without problems. People who are familiar with the frequency use it for a long time. Tingling in non-use may be my misunderstanding.

  16. Avatar
    Tony says:

    If you use split isochronic tones …do you not end up with binaural beat…eg say left ear 10 Hz and right ear 15Hz ..result 5 Hz difference?

  17. Avatar
    Tony says:

    I am still trying to understand how the low isochronic beats are ‘heard’.
    Our hearing is supposedly restricted to bottom end of 20Hz…are we just being made aware of on switching of the freq ?

    • Avatar
      Jason Lewis says:

      What you are referring to is the ‘pitch frequency’ where most adults can’t hear below 20Hz. All of my isochronic tones have a pitch frequency that’s usually in the range between 120Hz-200Hz; well within the human hearing range. With isochronic tones, the pitch frequency is rarely referred to.

      Binaural beats are created from two different continuous tones, which when sent separately to each ear create a single beat inside your head. Isochronic tones are basically a single tone which is switched on and off at regular intervals. Imagine a single continuous tone playing on a stereo system and you’ve got your hand on the volume switch. Then once per second, you turn the volume off for half a second and keep doing that every second. For half a second the volume is off, for the other half a beat waveform is formed. The beat is cycling once per second per second, i.e. at a rate of 1Hz.

      With isochronic tones, the Hz frequency relates to how many times the beat waveform cycles per second. See the example above; a 10Hz isochronic tone means the tone is switched on and off 10 times per second, which for simplicity, is referred to as a 10Hz beat in the brainwave entrainment community.

  18. Avatar
    Tony says:

    Thanks for the reply. I am now clearer on ‘what’ is heard. Can you expand or point me in direction ..a bit more about ‘pitch frequency’ and frequency spoken about and what exactly is the difference ..and how we use the higher pitch frequencies to ‘hear’ or become aware of them? Would you only pick up the low freq on a EEG?. sorry for being pedantic still does not clear up split isochronics and possibly creating same situation as binaural beats..

    • Avatar
      Jason Lewis says:

      The pitch frequency measures and describes what a beat sounds like, i.e. does the isochronic beat have a deeper bass sound, or is it high pitched and sharper sounding? The beat waveform frequency describes how many times the beat is repeating per second, i.e. how fast it is beating. You don’t really need to concern yourself about the pitch frequency, as that doesn’t have a direct influence on brainwave entrainment and doesn’t play a part on the measurement on an EEG. I only mentioned it because you were referring to humans not being able to hear below 20Hz. I change the pitch frequency just to suit the mood of the track. For tracks that are to be relaxing, for meditation or sleep, I tend to use a lower pitch frequency so it sounds deeper and more relaxing and I never have that lower than 100Hz. For an energizing, high focus track I might use a more higher pitched 200Hz isochronic tone, because that is sharper sounding and less likely to make you feel sleepy. That’s all you really need to know about the pitch frequency.

      Regarding split hemisphere isochronic tones. Think of this as two separate isochronic tones tracks playing independently of each other, one playing in one ear and the other one in the opposite ear. Better still, imagine someone playing and recording a drum beat at a rate of 5 taps per second (5Hz – 5 cycles per second). Then a separate recording of a drum beat is made at a rate of 10 taps per second (10 Hz). You then make an audio track where the left ear/channel hears the 5 drum beats recording and the right ear/channel hears the 10 beat recording. With headphones on, each ear can only hear each respective drum beat and not the other. So you are hearing two different beat recordings at the same time, but it’s different in each ear. A split hemisphere isochronic tones track works just the same. You hear two beats at the same time, not two tones as with binaural beats that create a single beat, but two different speeds of beats in each ear. This is what enables you to stimulate and influence each side of the brain with a different frequency of beat. Binaural beats can only stimulate and influence a whole brain effect using a single beat.

  19. Avatar
    Ulka Shukla says:

    Thanks for a detailed article .
    I have been using isochronic tunes for some years now and probably got habituated by it ..need to change .Any authentic source to use this in combination and particular app you recommend .

    • Avatar
      Jason Lewis says:

      Hi Ulka, thanks for your compliment on my article. Unfortunately, I haven’t come across any studies or much discussion about the problem with habituation and isochronic tones and how to overcome it. The consensus among experienced users is to regularly change the frequencies and music soundtracks you listen to. Adding music to the tones does change the waveform you are stimulated with, so that’s one of the main reasons why I provide different soundtracks for my isochronic tones sessions. I have released some tracks which use amplitude modulations in the music, instead of isochronic tones. It might be worth giving them a try if you haven’t already. I have them in a playlist on YouTube

    • Avatar
      Jason Lewis says:

      I’m not aware of any official research into habituation when using binaural beats, so I don’t know how exactly well it works. However, I know that is a popular method used to try and avoid it and I’ve heard people report that it can work quite well.

  20. Avatar
    Rahul says:

    One more think ii want to ask actually i am on Psychiatric medications for depression. I am not getting full effects of bwe after being on medications. Is itdue to tablets which i take. How bwe affects brain when someone is on medications. I ask from the doctor he said he doesnt have any idea of bwe so cant tell exactly

    • Avatar
      Jason Lewis says:

      I’m sorry Rahul, I’ve been asked this type of question a number of times over years but I’m afraid I haven’t been able to find any research or reliable information about the effects when combined with any type of medication.

  21. Avatar
    Ash says:


    may i please ask you, which frequency is the ideal one for bodybuilding, increasing energy?
    also which frequency that trigger testosterone hormone and what is the ideal time to listen to it?

    • Avatar
      Jason Lewis says:

      I haven’t seen any research relating to using brainwave entrainment/isochronic tones and bodybuilding, so I’m afraid I don’t know how effective it would be to help with that. I have a few different tracks for increasing energy but I recommend this 1-hour track, which would fit better than my shorter tracks for a training session: The effects from these tracks are mainly felt while you listen to them, so I recommend listening to the energy tracks while you are training/lifting weights etc. I don’t currently have any tracks to help trigger the testosterone hormone.

      • Avatar
        Ash says:

        oh ok, thank you so much for replaying. what do you think about the delta 1.5 Hz for HGH (Human growth hormone)? have you read any research related to that? also which brain wave is the idealist for producing energy/physical energy like working out? is it gamma or beta? i cant find information about gamma brain wave.

        • Avatar
          Jason Lewis says:

          I have seen 1.5Hz being linked to HGH, but also 4 or 5 other frequencies as well, so it’s difficult to know what may work if any. I haven’t seen any research relating to HGH and brainwave entrainment. It’s widely believed that 40Hz is the limit for achieving a brainwave entrainment effect, which is also where many believe the gamma frequency range begins. Once you get over 40Hz into gamma your brainwave activity isn’t likely to stay in sync with it. So from a brainwave entrainment perspective, I recommend high beta frequencies for increasing energy during workouts.

  22. Avatar
    evergreen says:

    I listened to an isochronic tone on youtube once for 5min. a month ago, since then i can listen it in my brain repeating itself and it is also causing problems like either my left or right nostril works continously. So either the body gets cold or increased temp.
    Is there any way to stop it….

    • Avatar
      Jason Lewis says:

      Isochronic tones have only been proven to have an effect while you are listening to them, that’s why you won’t find me claiming anywhere that there are potentially positive long-term effects. Once the tones stop, your brainwaves are no longer being stimulated by the sound and so they stop being in sync with the tone frequency. For you to think you are still feeling the effects after all this time and from such a short time listening to them, I think it may be linked to anxiety. I know that some people who are new to this type of thing can build up a strong feeling of anxiety, after worrying about the potential effects brought on by fear of the unknown. I suspect the problem may be psychological with you worrying about the potential effects and keep repeating the experience from memory in your head. When you keep going over the same thing in your head like that and worrying about it, it’s easy to then spot other potential side-effects like how your nostrils and body temp is feeling, then making links back to that experience and labelling that as the reason. I think the best way to overcome this is to realise that the side-effects you are mentioning are completely unrelated, so there is nothing to worry about. These tracks are literally listened to for millions of hours a month on YouTube across loads of channels. If the effects lasted for a long time people would just listen for 5 minutes and come back in a couple of weeks. But people keep coming back to listen because that’s the only way to feel the benefit and effects…while you are listening to them. If you are unable to stop thinking and worrying about this on our own, I recommend that you speak to your doctor about it or a specialist in dealing with anxiety issues. I hope that helps.

  23. Avatar
    Gogi says:

    HI, you are doing a great job Jason. I really like how you explain how does isochronic waves work on our brains. I have few questions. 10.4 alpha wave is best to rememering things right? Why are then theta waves used for studying foregin languages? which one of your record do you recomend for kids doing there homework and studiyng for tests?

    • Avatar
      Jason Lewis says:

      I have read something different about theta waves and learning languages. A University of Washington study tested students resting brainwave activity before learning French. They found that students with a higher amount beta/gamma and a lower amount of delta/theta activity were better at acquiring a second language. When you are dominant in theta, that is the lowest and most deeply relaxed awakened state you can be in. I think it would be much harder to really concentrate, fully understand and learn new information while in a theta state, so I would personally consider using theta while studying.

      There isn’t really a one-size-fits-all track or frequency range which is right for all kids while doing homework. So that does make it difficult to recommend one thing in particular, and why I have a number of tracks for studying and focus. If they have already learnt and understood the information, but are just trying to commit it to memory for a test, then I would recommend an alpha track, like the Memorization Study Aid product I have with the 10.4Hz frequency you referred to. If they are still trying to fully understand what is being taught in a workbook, then I would recommend a track that is mainly beta frequencies, like my Study Focus tracks. In the middle, I have a number of tracks which use a combination of beta and alpha wave frequencies, like Study Booster, Study Enhancer and Cognition Enhancer. The last 3 use similar frequencies but deliver the tones and brainwave entrainment effects in different ways. As we are all wired a little differently it does sometimes take a bit of trial and error, to see what method or frequency range works best for the individual. These types of tracks are made for a general audience. In an ideal world, you would hook up to an EEG and see in real time exactly what a person responds to best, depending on the goal and current state of mind.

  24. Avatar
    Desire says:

    Hi, I have %60 loss in my right ear. Would it effect the frequency? Plus would it work whenyou listen with bluetooth ear buds? And allegedly, YouTube videos were squeezed which means loss, is that true? I need to solve this frequency loss or change issue, thanks in advance…

  25. Avatar
    Kilowag says:


    I would like to know about the safety of using this type of sound while going off of those toxic and brain-damaging SSRI’s:

    Good fro stress reduction and for combatting ennnnhanced anxiety and depression caused by withdrawal, yes, but safe?

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      Jason Lewis says:

      Isochronic tones are considered a safe technology to use. I’ve seen lots of anecdotal feedback over the years where people said they used isochronic tones as an alternative to taking or reducing some of their medication intake. However, I haven’t seen any studies where these types of sounds where tested as an alternative to medication. So there isn’t any scientific research that I know of that can confirm if it can be a reliable alternative to medication. You would really need to ask your doctor to determine how advisable it would be for you to come off antidepressants.


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