One of the more fascinating aspects of what brainwave entrainment does, long-term, is the growing of your mental threshold, and your self-awareness.  I have been a participant of the Holosync Solution for several years, and its maker, Bill Harris, has gone to great lengths to explain why this technology does this.  Much of his research is based on the concept of Entropy and Open Systems, (an idea that nominated its discoverer for a nobel prize).  The brain being an open system, and the technology being a specific type of entropy, this technology has been shown to help the brain reorganize itself at a “higher level” through the growth of new neural pathways. This basically means that 
First discovered by biophysicist Gerald Oster at Mount Sinai Hospital in New York City, Brainwave Therapy sends pure, precisely tuned sound waves of different frequencies to your brain via stereo headphones. In his EEG research, Oster discovered that when different vibrations, or sound frequencies, are delivered to the brain separately through each ear (as with stereo headphones), the two hemispheres of the brain function together to "hear" not the external sound signals, but a third phantom signal. This signal is called a binaural beat, and it pulses at the exact mathematical difference between the two actual tones. For example, a signal of 100 Hz delivered to the left ear, and a signal of 107 Hz delivered to the right creates a binaural beat of 7 Hz that in this case falls into the Alpha range
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.
The main gist of brainwave entrainment audios, without getting too technical here, is that they effortlessly guide one’s brain (when listened to with stereo headphones) into a specifically targeted state, as designated by the creator of the audio. They are able to alter your brainwave states through the use of specific audio frequencies, and specific beats-the most common of which being binaural beats (though there are other types of beats being used as well).  When one frequency is played into one ear- let’s say 1115 Hz- and a slightly different frequency is played into the other-say 1125 Hz- the brain is forced to reconcile the two, and creates its own “phantom” frequency that is the difference between the two- in this case 10 Hz.  Not only does this allow the brain to be led into specific brainwave states, but it also allows the two hemispheres of the brain to synchronize with each other, stimulating and promoting whole-brain functioning.
Brainwave entrainment is a field of study and endeavor founded in the same physiological and psychological processes that make music, drumming, and chanting so powerful as methods for transforming the mind and spirit and aiding in healing of the body. These processes involve how the electrical energy in our brains synchronizes with sounds and visual stimuli, producing a particular brainwave frequency and its associated mental states. 
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 (http://www.mindamend.com/shop/sleeping-and-dreaming/sleep-induction-isochronic-tones/) 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 (http://www.mindamend.com/shop/sleeping-and-dreaming/deep-sleep-8-hour-sleep-cycle/). So it does depend on the individual track you are using.
Meditation enhancement: There are several companies that sell brainwave entrainment sessions specifically designed to enhance meditation. The sounds provide a stimuli to focus on during the meditation, and the brain waves naturally shift towards the frequency provided. Whether meditation is actually enhanced by brainwave entrainment is a subject of debate. However, advanced meditators commonly experience brainwave synchronization – which the right and left hemispheres display the same frequency brain waves.  While there are scientific benefits of meditation, it is unclear as to whether they are enhanced, hindered, or unaffected by adjunctive brainwave entrainment.
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.

Brainwave Mind Voyages 24 CD Set: Brainwave Meditation Programs, Hemispheric Synchronization, and Brainwave Entrainment Technology (24 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)
My personal experience of this was that it could get very harrowing; at times, I would literally be gritting my teeth and contracting my ribs while I was in meditation, because it was pushing me so hard. I began to ask, “Is it necessary to push this hard in such a static way and create overwhelm over such prolonged periods in order to propel spiritual evolution?”
Those who study the Law of Attraction are familiar with the Zero-Point Field as the source point for "manifestation" of your desires. Some even call it the connection to the Divine. Scalar waves are an energetic way to assist with elevation of consciousness and achievement of your dreams – a truly unique and beneficial addition to brainwave entrainment ONLY available in Neuralsync™!
With so many thoughts begging for your attention each day, it’s hard to believe that most of them are the same ones you had yesterday. Actually, many psychologists who have studied the thought processes associated with our thinking patterns would agree that, on average, 90% of the thoughts that we become aware of throughout the day are the same thoughts that we have already experienced, over and over again. The reason we are so prone to repetitive thinking is because the brain is always … [Read more...]

I have had your Equisync CD’s for a little more than 2 years. Some recent stresses prompted me to start listening to them again. Wow……these cd’s are no joke. I have been playing them consistently for the past 2 weeks and they are a tremendous help. I have to ask about the Equisync III cds. Can this elicit a detox reaction? I played it in its entirety one night and the next morning I felt like I was having a healing crisis. I am not complaining 🙂 I believe these particular cds allows tremendous amounts of healing light to enter the body through the higher chakras.

Brainwave entrainment represents a way of using technology to take our meditation and our spiritual practices into territory that has previously been very difficult, if not impossible, for us to venture into. My inspiration for creating the Profound Meditation Program 3.0 was not about just adding binaural beats or isochronic tones to music, using conventional audio entrainment methods to create brainwave patterns, and say, “Hey, this is the next big thing!” To me, it is all about what we can do—even if it’s pulling from way outside of the box—to enable such a profound coherence that we can go to meditative depths that have been practically out of reach. With the Profound Meditation Program 3.0, I wanted to do something that hadn’t been done before, taking the technology to the next level.
This is probably the most popular choice of frequency. The theta state is a state of tremendous stress relief. The benefits associated with theta level relaxation include improved concentration, reduced hyperactivity and improved memory. While in a state of theta relaxation, one’s blood pressure, breathing and heart rate all slow to a much more restful and healthy level that promotes natural healing. During theta relaxation one may also experience vivid flashes of mental imagery as the mind opens to memories or subconscious information that is not available to the conscious mind during the normal waking state. The theta state is a very deep state of relaxation that is excellent for deep hypnosis and mental programming.
Unleash your mental power with advanced brainwave entrainment technologies from mindmachines.com.  Relaxation, meditation, sleep, accelerated learning, peak sports performance,  motivation, stress relief, behavior modification, freedom from anxiety and more are possible with the push of a button with this powerful mind entrainment technology.  By altering brainwave your brainwave frequencies using frequency controlled patterns of light and sound these and many more brainwave states can be achieved in just minutes.  Why spend years learning to meditate when you can do in instantly with this a mind machine.
The specific benefits and claims from this technology are often disputed and considered scientifically questionable. One problem is that there are few experiments that have utilized brainwave entrainment for the purpose of treating a specific psychological ailment (e.g. insomnia). And the experiments that have been conducted are largely backed by corporations that sell the software; hence it could be speculated that there are conflicts of interest.
* Supports iOS 5.0 and higher * Thanks for making Brain Wave the Top Selling Brainwave Entrainment app 4 years! This update includes improvements to our last major update, which included a ton of new features, including the ability to use your iTunes Music as the background and Alarm Audio, support for running another audio app simultaneously, such as a web or ebook reader, and UI updates for iOS 7.
The training process allows you to consciously access deeper levels of your brain and consciousness. Your whole brain power and function expands. You become intuitive, relaxed yet focused, creative, your thoughts become clearer and information processing improves more and more. The left and right brain hemisphere synchronizes and you'll start using the full power of your left (analitycal - logical - Intelligence) and right (creativity - imagination - visualisation) hemispheres together. To say that this helps in all imaginable areas of your life is an understatement. You'll also begin to discover deeper realities beyond the physical. You become happier, more relaxed and balanced.
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)
Just as you turn the dial on a radio to get the station you want, with Brain Sync you can tune your consciousness to the ideal state of mind. Want to meditate or explore the mysteries of your mind? Listen to Theta Waves. Want to study for an exam, Gamma Waves will boost your brain into high gear. Need a good night's sleep? Delta Waves will help you get the rest your body craves. Feeling overwhelmed and need to chill? Alpha Waves wash away stress and increase creativity.
Specific tones that resonate at certain frequencies are created and embedded within the acoustic architecture of the original waveform. Your brainwaves latch onto these embedded carrier frequencies and attune themselves to the same vibratory rate. Brainwave entrainment now occurs that is similar to binaural beats yet there is no need for headphones to deliver these entrainment effects.
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.

You’ve probably heard people talk about the power of “positive thinking.” While some might tell you that it’s based on faith or strong belief, research has shown that there’s a third ingredient that helps you get that frame of mind – Alpha brainwaves. The rhythm produced by this brainwave – especially those that hit the frequency of 10 Hz – is said to help in the enhancement of one’s mood and thoughts, enabling one to experience and enjoy a positive state of mind.


Theta brainwaves in the frequency range of 6 to 9 hertz are known as thalpha waves because of their proximity to alpha waves. They are seen during states of high suggestibility, during hypnosis, and during paranormal experience and are also connected to an increase in human growth hormone (HGH) levels and higher blood flow to the brain. Theta brainwaves sit between the realms of the subconscious and conscious mind, making them an especially useful brainwave state for developing creative thinking, working through emotional problems, and integrating subconscious and conscious experience. 
No matter what you use: USE it. At least for a couple weeks.  And have realistic expectations...  Brainwave Entrainment is not some pill or quick solution (even if there are some sessions that usually give almost immediate results e.g. for sleep induction or pain relief), it is a tool that requires training and works best in combination with good breathing / meditation techniques.
And don’t forget, the super-deep meditation and brain synchronization you’ll experience with Holosync® also creates some truly amazing changes in mental and emotional health. Anger, depression, sadness, anxiety, substance abuse, and a whole universe of dysfunctional feelings and behaviors fall away—even in people who have “tried everything” without success!
Most of our Royalty Free brainwave entrainment music uses an audio technology known as "binaural beats". These binaural beats are embedded in the music in order to bring about desirable changes in brainwave activity, thereby encouraging various states of relaxation, deep meditation or sleep. When played with headphones, you may be able to hear the binaural beats as a subtle pulsing sound beneath the music.
This music encourages a state of delta relaxation. Delta brainwaves are most prevalent during deep, dreamless sleep. The delta state is a mostly unconscious state that is essential to one’s physical, emotional, psychological and spiritual wellbeing. People who are able to achieve a state of delta relaxation through meditation will sometimes describe spiritual encounters and out of body experiences. The delta state is perfect for inducing profound spiritual experiences, healing and deep subconscious repatterning. Delta frequency brainwave entrainment music is also a fantastic cure for insomnia.
Don’t let someone fool you by making this sound overly technical, scientific, or too good to be true. It can truly change your life! It changed mine in a huge way. That’s why I’m so passionate about it! But it isn’t a “magic pill” that will effortlessly solve all your problems. I truly think this technology is nothing short of a miracle, and is on the very edge of the future in scientific ways to influence consciousness, personal development, and success in life, but it is also still practical, and worth exercising some discrimination and skepticism when making a decision on where to spend your money.
PMS: There is a little research that supports the efficacy of brainwave entrainment for PMS symptom reduction in women. Women with long-standing and severe forms of PMS were administered photic stimulations for a series of 3 menstrual cycles. Following the photic stimulation, it was noted that women reported 64% improvement by the second menstrual cycle and 76% improvement after all three cycles.
Gamma brainwaves occur during creative thinking and processing of memory and language and in many learning activities. These brainwaves are not present at all when a person is under anesthesia, but return as soon as the person becomes conscious again. Multiple scientific studies have shown gamma brainwave entrainment to be helpful for reducing distractibility, improving short-term memory, improving motor coordination, and relieving migraine headaches.
Tracks that move from alpha to theta can be a perfect vehicle for transitioning from a hectic day into a relaxing and rejuvenating sleep. Beginning with alpha waves takes you into a light but still alert meditative mind state where the difficulties of the day can be resolved and put to rest. Later, theta waves go deeper into the unconscious, preparing you for sleep and dreams.
Learning: Since performance improves among those with ADHD and cognitive function may be boosted, one may hypothesize that learning would also improve. Those that are struggling to learn as a result of inattentiveness may benefit from stimulation with beta frequencies. Deficits in learning tend to be associated with abnormal or excess slow wave frequencies.
Brainwave entrainment can help you with this in a few different ways. First it has a tendency to help you relax very deeply. Just the act of relaxing daily will help to alleviate this stress and allow the body and brain to recoup. It also will stimulate the brain and body to produce more serotonin, dopamine, and melatonin, which will also help to improve your mood and keep you relaxed. But the greater benefit that comes from regular use of this technology is in its ability to enhance your awareness and perception. It can stimulate your brain and mind to have greater insights, greater flexibility and creativity in the decisions you make as you move through life, and this gives you a more resourceful means of finding your peace and resolving the problems and challenges you face in your life.
I can’t thank you guys enough for saving my life. I tell everybody I know about your guys. I love you guys. I word of mouth advertise and give my testimony to the power of your technology almost everyday. I am only 30 years old, but since I was 17 teen years old my life was a miserable roller coaster ride. I ended up being diagnosed with fibromyalsia, bipolar disorder, adhd, manic depression, sever anxiety, severe depression, chronic fatigue syndrome, and you name it. Because of your product, I have never felt better in my entire life. I can cope and manage and more. I can finally sleep a full night without tossing and turning waking to knots in my back and stomach. I can finally stand straight and tall without feeling like I have a pinched nerve in my neck. I have energy again, and a renewed passion for life!

True on your point about diminishing returns. It is like dieting. The bulk of the weight comes off at the beginning and then you lose a pound or so if you are diligent. Yes you lose the high of the original gains but you don’t receive more gains because you are in a better place. I am a big believer in data. When the gains begin to be less obvious a daily entry of how your emotional state was (1-10) and naming something you are grateful for goes a long ways. I guarantee a person will overall be in a better place on average. As always, thanks for your contributions Daniel.
So what happens when the mind is entrained with a sound or vibration that reflects the thought patterns? When the mind responds to certain frequencies and behaves as a resonator, [there] is a harmonic frequency that the mind can attune to … slower tempos have been proven to decrease heart and respiratory rates, thereby altering the predominant brain-wave patterns.
Good article. Richard, there are numerous studies dictating the research behind entrainment. Please see http://brainwavebooster.com/brainwave-entrainment-research/ for a list of many peer reviewed studies. The author here is totally correct in his labeling of brainwave entrainment as a therapy tool. Hope this helps. There are other studies out there as well, one only needs to Google it.
This is why we have included not just audios in our program The Missing Link, but also include step by step instructions on how to meditate while listening to the audios, how to harness the chi in your energy system while going through this metamorphosis, and how to direct your mind in a way that all of this integrates in a way that propels you forward in the direction you want to go.
In addition, Western culture reinforces thought and communication styles associated with the left brain hemisphere, which controls logic, language, and linear thinking in a majority of people, as opposed to the right hemisphere which controls brain centers for emotional, intuitive, creative, and non-linear thought processes. Note that a significant minority of people has the opposite hemispheric dominance than the majority of people.
Filed Under: Flow State, Healing, iAwake Weekly Call, Life Optimization, Practice of Meditation, Profound Meditation Program, Recovery from addiction, Science of Meditation, Waking Up Tagged With: Benefits of Brainwave Entrainment Meditation, Changing Our Brains, Conscious Evolution, Daily Meditation Practice, Emotional Healing, Integral Practice, Life Optimization, Meditation Technology, practice of meditation, Profound Meditation Program, Profound Releasing, Releasing Trauma, Science of Meditation, Spiritual Development, spiritual maturity, spiritual practice, Stealing Flow, Waking Up, Workout Ecstasy

Brainwave Mind Voyages 24 CD Set: Brainwave Meditation Programs, Hemispheric Synchronization, and Brainwave Entrainment Technology (24 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)

Practitioners are discovering a number of different areas in which entrainment therapy may bring positive benefits. From managing mental health more effectively through to providing increased mental focus and concentration, it is thought the technique can be adapted according to the specific issues being treated. An improved immune system, enhanced levels of pain management, and a reduction in autoimmune disorders are also thought to be achieved through the therapy, leading many individuals with chronic ill health to consider brainwave entrainment as a non-invasive yet effective therapy.
What happens when you meditate using the Profound Meditation Program 3.0 is that instead of statically giving the nervous system the same level of juice every day, you consciously attune and intuitively adjust your nervous system and your energetic system’s unique stimulation recovery cycle. With PMP 3.0, you have a type of system with enough carrier frequency power and biofield amplitude to push your nervous system and your energetic system for a lifetime—and it is a system as dynamic as your growth and recovery cycles are. This system will enable you to push your spiritual development and growth much more quickly, recover much more quickly, and experience less overwhelm.
So how’s that novel coming? Your new song? What about that program you were going to write? Or the website you wanted to build? If your creative project, no matter what it is, isn’t coming along as smoothly or as quickly as you’d hoped, you’re not alone. After a lot of soul-searching, research, and banging my head against the wall, I've learned a lot about creative flow, and I'd like to share these tools, tactics, and insights with you. But back to where we started... It’s not that you didn’t … [Read more...]
FEND OFF negativity, stress or tension in any form – It's no great mystery: Successful people are greater prey for negativity, outside criticism, bitter bystanders, and armchair critics. Jealousy is a powerful emotion. But what if you possessed an emotional "force field" toward this nonsense, and you remained strong and focused regardless what others said? Imagine you being unstoppable...
The mechanism for this is that when your eyes or ears are exposed to a particular frequency of pulses or beats, the thalamus first distributes this information to the entire brain, including the visual and cerebral cortex where neural activity begins to synchronize to the incoming frequency, producing hemispheric synchronization and a balance of brainwave activity across the brain.

In 1984 medical researcher Dr. Gene W. Brockopp published a paper making several conclusions of audio and visual entrainment (AVE). Such conclusions were that hemispheric synchronization caused by AVE is related to increased intellectual functioning, practiced use of AVE overtime leads to a cumulative effect, and AVE may result in the recovery of early childhood experiences.
So my question is: Why? When I read it, I had a bit of a fear of brain aneurysms. Therefore, 1. could someone contact me to tell me why use of your product shouldn’t continue past 2 hours? [I probably won’t heed the reason unless it’s a life or death warning: I love this product that much!] 2. Please feel free to post my letter in your testimonials, if you ever decide to post such customer comments.

“A quite different phenomenon results when stereophonic earphones are used and the signals are applied separately to each ear. Under the right circumstances beats can be perceived, but they are of an entirely different character. They are called binaural beats. . . . Binaural beats require the combined action of both ears. They exist as a consequence of the interaction of perceptions within the brain.”
John and Doug discuss how to be a better you - how you should always be available to what you can learn. You have to show up to whatever you experience and do the best you can do in that moment. For John, his daily practice helped improve 30% in spirituality, in health, and in mental intelligence. A person can become a champion as they continue to practice. Discipline and motivation increases - it becomes deeper. When you learn about practice, you can accomplish way beyond what you thought … [Read more...]
There's no doubt that brainwave entrainment audio is a great technology for anyone who is interested in encouraging altered states of consciousness and it certainly can help people to reach deeper states of relaxation than they might normally have access to. I myself will often listen to brainwave entrainment music in order to enhance my practice of meditation. But let’s keep a balanced perspective, put all the marketing hype to one side for a moment and acknowledge that there is no brainwave entrainment technology in this world that can make you meditate like a Zen monk “at the touch of a button”, despite what some might like you to believe. The mind is NOT a machine. It moves through various states of consciousness in an organic way and at a natural pace. We certainly can guide and accelerate that process with the use of brainwave entrainment audio, but we cannot control it with the same sort of specificity and immediacy as you might control the speed of the car you drive.

Only 4 of the participants reported no change as a result of the stimulation. Four years later in a study (1989) by Anderson analyzed LED photic stimulation for the treatment of headaches. There were 60 patients included in the study which involved Variable Frequency Photo-stimulation (VFP) with specialized goggles that contained light-emitting diodes.
The training process allows you to consciously access deeper levels of your brain and consciousness. Your whole brain power and function expands. You become intuitive, relaxed yet focused, creative, your thoughts become clearer and information processing improves more and more. The left and right brain hemisphere synchronizes and you'll start using the full power of your left (analitycal - logical - Intelligence) and right (creativity - imagination - visualisation) hemispheres together. To say that this helps in all imaginable areas of your life is an understatement. You'll also begin to discover deeper realities beyond the physical. You become happier, more relaxed and balanced.
Every NeuralSync™ audio is recorded with full-range frequency sweeps that cycle rhythmically throughout the entire audio. The dynamics of the sweep are then additionally enhanced with simultaneous left-to-right channel crossing. Because of this augmentation, the effects are multiplied, the intensity is amplified and the brain is drawn into the mental state more consistently and powerfully than with the static methods of other protocols.
Filed Under: Brainwave Entrainment, Creativity, Emotional Healing, Flow State, How to Let Go, iAwake Weekly Call, Life Optimization, Meaning of Life, Meditation Technology, Practice of Meditation, Spiritual Development, Waking Up Tagged With: Benefits of Brainwave Entrainment Meditation, Brain Entrainment Meditation, Brainwave Entrainment, Brainwave States, Changing Our Brains, Conscious Evolution, Daily Meditation Practice, Finding your purpose, Integral Recovery, Life Optimization, Meaning of Life, Overcoming Depression, practice of meditation, Spiritual Development, Stealing Fire, Stealing Flow, Waking Up
PMS: There is a little research that supports the efficacy of brainwave entrainment for PMS symptom reduction in women. Women with long-standing and severe forms of PMS were administered photic stimulations for a series of 3 menstrual cycles. Following the photic stimulation, it was noted that women reported 64% improvement by the second menstrual cycle and 76% improvement after all three cycles.
Our everyday, waking brain used for active intelligence operates at approximately 13 hertz, which is in the range of high alpha or low beta frequencies. People who have certain learning disabilities and problems with attention often have low levels of 13 hertz frequency brainwaves in crucial areas of the brain used for sequencing tasks and doing simple math calculations. This is one concrete example of how brainwaves are associated with thinking and behavior. Each identified brainwave frequency has a different effect on a person’s ability to think, act, and feel.

5) Your cerebral blood flow is being increased - CBF is associated with many forms of mental disorders, including anxiety, depression, attentional problems, behavior disorders and impaired cognitive function. CBF tends to lower as we age often causing cognitive decline. People experiencing depressed mood usually have lower levels of CBF in the left frontal and prefrontal lobes.
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. 
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.
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