Gamma brainwave states are the most rapid in frequency. Gamma has long been considered the brainwave that is able to link and process information from all parts of the brain. It is the frequency that brings with it the ability to process large amounts of information in relatively small amounts of time. Think of generating more Gamma activity as getting a processor upgrade for your brain.
I can offer a hypothetical--however do not know know practical it will turn out to be. There is a fair amonut of bad science on this topic on you tube. The gamma wave frequency is associated with attentional focus and arguably a unified sense of self. If it could be entrained it should lead to a meditative focus-like exceptionally well-trained meditators. Some but not all studies on meditating Buddhist monks suggest this is so. Does this really and more generally occur--I will say there is nothing lost in trying--we all go into a 40Hz range on occasion without ill effect-- but I would not put confidence in the purported methods out there at present. Good luck.
The implications and potential benefits of brainwave entrainment technology are staggering, and a seemingly infinite amount of doors have been opened to be explored.  This technology is highly useful in the self-help/personal development field in a variety of ways.  It can also be used to enhance NLP and hypnosis recordings to make the mind more receptive to suggestion.  Brainwave entrainment can be applied to help people fall asleep, to improve focus and concentration, or to relax.  Recent and modern experiments are also being held to see if brainwave entrainment may help  to treat and/or cure mental “disorders” such as depression or ADD.  One of the most common and popular uses of brainwave entrainment is to effortlessly induce deep meditative states.
Anxiety: In a review of brainwave entrainment research, there were several studies that investigated short-term stress relief as well as long-term stress or “burnout.” Several used modalities of auditory stimulation, while a couple used audio-visual entrainment. Those with heightened short-term stress and anxiety were undergoing medical treatments, experiencing addiction, and/or were just anxious adults.
Most wisdom traditions have employed methods that allow the subjects' brain waves to slow down such as meditation, [Hindu] kirtan, [Gregorian, Menzuma or Sufi] chanting, Hebrew davening, Native American drum circles and rain chants, Tibetan prayer bowls, and whirling dervishes and African trance dancing. The rhythm of these wisdom tradition technologies actually slows people's brain waves from their normal busy brain frequency we call Beta (13-30 cycles per second or Hz), to Alpha (8-13Hz) -- meditation, Theta (4-8Hz) -- deep relaxation and dreaming, and Delta (.5-4Hz) -- slow wave or dreamless sleep.
So let’s start with the basics, and we can move on from there. An easier way to understand brainwave entrainment would be to think about how your brain gets entrained in real life, without the use of any technology. Have you ever heard a song on the radio that stuck into your mind throughout the day and maybe even the next one? Now think about a repeating sound, like the ticking of a clock – simply listening to it your brain starts producing alpha waves that match that tick-tack sound. Or have you ever been at a meeting when you immediately felt sleepy? That is because the majority of people in the room were feeling that same way and your brain simply matched the brain wave patterns they have been emanating. We can go on exemplifying this phenomenon, but the main point is that our brain is altering and adapting in direct response to what we hear, think, and see.
Because the mind and body are a single system, changing our brainwaves and spending more time in harmonious, relaxed, and restorative mind-states also affects our physical health. Physical health then reinforces our mental-state, and a feedback loop of either positive or negative processes becomes established. Research studies have shown beneficial effects of using brainwave entrainment for treating migraine headaches, premenstrual syndrome, and for managing physical pain.
Two people with ADHD for example could have completely different ADHD subtypes. One could have inattentiveness as the primary symptom as a result of high theta waves, and the other could have high beta-2 waves as feel hyperactive. While generalized entrainment protocols should be studied, it is important to consider that each person may respond differently to the protocols; each person has a unique neural footprint.
The reported PMS symptoms that improved included: affective lability, anxiety, appetite changes, bloating, breast tenderness, concentration difficulties, depression, fatigue, and irritability. Researchers noted that there was a clear “trend” toward a reduction in social withdrawal as a result of symptoms as well. A total of 49/50 women reported improvements.
Most programs start at a work/life busy brain Beta frequency of twenty light flashes per second (20Hz) and slowly ramp them down to Alpha (relaxation and meditation) at 8-12 HZ, Theta (deep relaxation and dreaming) at 4-8 Hz) and Delta (dreamless deep relaxation) of .5-4Hz. We have taken measurements at Mass General with state of the art EEG equipment and have seen a slowing of the brain waves from Beta to Theta in two minutes and complete brain wave harmonization in the left, right, anterior, posterior and occipital regions of the brain.
These are lower frequency waves: The state is generated when our thoughts are really not concentrated and our minds wander freely, or we are in a relaxed state such as meditating or daydreaming. We also experience Alpha Brainwaves when we are gently busy with routine tasks like pottering in the garden, taking a shower, putting on makeup, doing light housework. Alpha is considered to be the bridge between the conscious mind and the subconscious mind.
I personally have been experimenting with binaural beats – both in and out of the float tank – for the past year or so and they have quickly and easily become one of my favourite go-to “hacks” for helping me achieve a desired state of being. From listening to a specific track right before going to sleep which helps put my mind and body in a state of relaxation and recovery to, on the flip-side, listening to a track that helps prime my brain-state for creativity and focus right before I sit down to do some work – like writing this blog! They are also an enjoyable and effective asset to try out and experiment with while in the float tank. For the reasons mentioned above, as well as the sound frequencies can resonate a subtle but noticeable vibration in the tank, water and your body making for quite the unique floating experience!
When making an educated decision on what product is best for you, it is important to have a general understanding of how the technology works, and what the benefits are of visiting the specific brainwave states.  Please click the link to visit a more detailed article –  How Does Brainwave Entrainment  Work, and the benefits of Alpha, Theta, Delta, and Gamma brainwaves.
3) Theta waves – these waves exist between 4 and 7 Hz. This state is commonly referred to as the dream or “twilight” state. Theta is associated with learning, memory, REM sleep and dreaming. Memory development is also enhanced while in this state. When in a theta brainwave state, memory is improved (especially long-term memory), and access to unconscious material, insights and creative ideas is increased.
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.

Relaxation: There is already evidence that brainwave entrainment helps improve relaxation. In studies analyzing short-term stress and anxiety, significant improvements were noted. This has been verified by other studies that suggest brainwave entrainment enhances muscle relaxation in biofeedback and can help with pain reduction and migraine headaches. The relaxation-induced response of entrainment may be responsible for a variety of the benefits.
Binaural beats can be experienced in any float session you book.  To this point in your floating practice you may, or may not, have heard of – or perhaps already experienced – binaural beats and their effective use of being a unique option/tool to listen to while in (or out of) the tank. But what exactly are binaural beats, how do they work and why choose to listen to them? All good questions, so here we go:

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.

I also believe that the dangers of brainwave entrainment should be further explored as well. There are relatively vague benefits, but it remains unclear as to whether entraining certain frequencies may be detrimental to performance or induce harm. Despite the fact that brainwave entrainment has existed for a long term, it remains an understudied niche in neuroscience.
This is the slowest band of waves that our brains produce and they occur when we are in deep, dreamless sleep. These waves are very beneficial for the body which restores and heals itself when in this state. The delta state releases anti-aging hormones, including melatonin and DHEA. Human growth hormone (HGH) is another anti-aging hormone that is increased when delta brainwaves are occurring inside the brain, due to the stimulation of the pituitary gland. HGH maintains the skin, bone density, cartilage, and the joints in your body as well as speeds up the healing process of joint and cartilage injuries. HGH can also help heal physical pain.
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 https://www.youtube.com/watch?v=Lj5tHl2cuWw&list=PLveg0IEcZWN6OIRZyLkv0BJADY7Q6xFCl.
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: https://www.mindamend.com/shop/energy-and-motivation/high-energy-builder/. 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.
First of all thank you for your amazing website, I have a question regarding these matters, I can make both binaural beats and isochronic tones for myself but I doubt for low frequencies states (Theta and Delta) which one is better? Because I searched a lot and saw that binaural beats are better for low frequencies and for high frequencies (Beta Gamma Lambda….) isochronic tones are more effective. Also, for Alpha states some said isochronic and other said binaural.

I have spending time in a floatation tank for the last 9months and just recently added the audio of crystal bowls into the tank. HOLY FLOAT! If you have experienced the bowls live then you know the physical experience that they produce; aside from the meditative side. Well, this effect is accentuated 10fold while in the tank. I have also started to float with binural entrainment audio and have seen a few effects.


  It's like gaining a new level of clarity... understanding.... wisdom. When you're able to artistically and logically render solutions to problems... when you can objectively and subjectively evaluate opportunities and their innate qualities... when you can read people and empathetically understand them... you're given a foresight that others simply lack.
Alpha (12hz – 8hz) – Awake, but deeply relaxed. Simply closing your eyes will produce alpha brainwaves. This category is associated with daydreaming, visualization, imagination, light meditation. Brainwave expert Anna Wise called the alpha range the bridge between beta and theta. (More information can be found in Wise’ book The High-Performance Mind)
The brain is composed of millions of specialized cells called neurons. Neurons send signals to other neurons using electro-chemical messengers called neuro-transmitters that attach to receiving sites located on the neurons themselves. There is a space between the end of the neuron and the receptor called the synaptic gap. As neuro-transmitter chemicals move across this gap, a small electrical charge is created. 
This BRAINWAVE MIND VOYAGES 24 CD SET includes the following BMV CDs: Lucid Dreaming, Astral Trance, Alpha Brainwaves, Theta Brainwaves, Delta Brainwaves, Tones, Astral Vibrations, Remote Viewing, Beta Brainwaves, Lucid Dream Cycle, Lucid Dreams Hypnosis, Guided Dream Incubation, The Whales CD, Rainstorm, The Waters CD, Nature Sounds, Heartbeat Meditation CD, The Om Meditation, Ganzfeld Effect/ White Noise, Breathing Silent Mindfulness, Breathwork Yoga Yogic Breathing Techniques, Tibetan Singing Bowls, Schumann Resonance, Sacred Healing Frequencies Solfeggio Healing Tones - Using embedded brainwave neurotechnologies, your brainwaves will become tuned to the specifically chosen brainwave ranges. For centuries, it has taken years of physical, mental and spiritual training to achieve peak states of consciousness. It is now possible to induce any specifically chosen state of consciousness. Now, you can tune your brainwaves to specifically designed brainwave states, simply by listening to a Brainwave Mind Voyages CDs. PEAK EXPERIENCES AT THE TOUCH OF A BUTTON! Your awareness will become free to explore new states of clarity as you experience the effects of the embedded brainwave entrainment technology. Your conscious awareness will become free to take flight into your mind's eye. You will explore new depths as the embedded brainwave entrainment ensures that you will enter the ideal brainwave range for maximizing your brain power. Brainwave Entrainment Technology- Advanced Brainwave Training- Multi-channel binaural beats/binaural beat frequencies- Monophonic brainwave entrainment tones - New BMV entrainment technique that works without the use of headphones! Autonomic Audio Pacing Technology (AAPT) - Only found on BMV CDs! Cutting-Edge Vibrational Sound Therapy- 3D Psychoacoustic Soundscapes. Geniuses like Albert Einstein, Nikola Tesla, Jefferson, Edison and many others have utilized their natural brainwave states and now, you can too by listening to these CDs!

Recently developed entrainment software has been designed to correct specific imbalances in hemispheric activity associated with undesirable mind-states. For example, people suffering with depression often have more activity in the right hemisphere, and specially designed brainwave music decreases this activity while increasing activity in the left hemisphere, reducing depression.
However, yoga and meditation take time to learn and master, and until the student becomes proficient, progress can be slow and frustrating, leading many people to abandon the effort before they see the benefits. Brainwave entrainment has the potential for helping a person enter the relaxing and rejuvenating mind-states brought about by yoga and meditation without the learning curve and time needed for mastering these other techniques. Brainwave entrainment may even facilitate learning other mindfulness methods by helping a person achieve success faster and more reliably. 
The only downside is that there is a limited choice available – only 8 tracks in fact (but they are so powerful you are likely to forgive them). The tracks range from the performance enhancing Deep Concentration, the amazing Crystal Clear Mind (which I count as one of my secret weapons when I want to get something done quickly to meet a deadline). And the awesomely mind expanding God Consciousness.

The implications and potential benefits of brainwave entrainment technology are staggering, and a seemingly infinite amount of doors have been opened to be explored.  This technology is highly useful in the self-help/personal development field in a variety of ways.  It can also be used to enhance NLP and hypnosis recordings to make the mind more receptive to suggestion.  Brainwave entrainment can be applied to help people fall asleep, to improve focus and concentration, or to relax.  Recent and modern experiments are also being held to see if brainwave entrainment may help  to treat and/or cure mental “disorders” such as depression or ADD.  One of the most common and popular uses of brainwave entrainment is to effortlessly induce deep meditative states.
This is good to understand because this is another area where people can make huge promises that may or may not be true. Even in this realm, there is a level of practicality that can be followed. Even meditating at the rate of a super-human monk is not going to “magically solve all your problems”. This technology cannot pick negative beliefs out of your head and implant positive ones just by influencing your brainwaves. It cannot just make you a different person.
Since the beginning of this year, I’ve been doing meditation with the help of audio-beat technology from a well-known brand, which I thought was a bit expensive. But, at least it gave me an insight into how the mind could and would give me an edge in solving most of my problems. From February, I decided to double the dosage to that which was recommended by the firm as I was desperate for a cure.
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“.
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