Hemi-Sync® – Using Sound Technology to Explore and Enhance Consciousness


Hemi-Sync®, short for hemispheric synchronisation, is an audio-guidance, binaural beat technology developed by consciousness pioneer, Robert Monroe. Through extensive brainwave research, Monroe and his team observed that specific sound patterns could safely and gently guide the brain into various states ranging from deep relaxation or sleep to expanded mindfulness or “extraordinary” states.

The audio-guidance process works quite simply by sending different sounds (tones) to each ear by stereo headphones. The two hemispheres of the brain then act in unison to “hear” a third signal – the difference between the two tones. This is not an actual sound but an electrical signal that can only be perceived by both brain hemispheres working together. The result is a focused, whole-brained state known as hemispheric synchronisation, or “Hemi-Sync®” an optimal condition for improving human performance.

Specific combinations of Hemi-Sync® signals, for example, can help you to achieve laser-like focus and concentration. Different Hemi-Sync® signals are used to facilitate deep relaxation, expanded awareness or other desired states. Depending on your intended goals, Hemi-Sync® can be combined with music, verbal guidance or subtle sound effects to strengthen its effectiveness. You will remain in total control as these recordings do not contain subliminal messages. Hemispheric synchronisation does occur naturally in daily life but typically only for random, brief periods. Hemi-Sync® can assist you in achieving and sustaining this highly productive, coherent, brain-wave state.

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Hemi-Sync® Metamusic®

Music exercises mixed with Hemi-Sync® for a variety of benefits. Metamusic® is more than music.


From soul-stirring New Age to dramatic ambient, and the timeless popularity of classical, Metamusic® audio exercises combine delightful musical selections with Hemi-Sync® binaural beats sound technologies to entertain and benefit the listener. Many titles feature special blends of Alpha, Theta, and Delta frequencies to slow excess mental activity in order to facilitate meditation or support deeper, more profound relaxation. Other selections feature a predominance of Beta frequencies for focus and concentration, or Delta frequencies for sleep enhancement. Metamusic® exercises are experiential and may be used to facilitate a given application or simply for musical enjoyment (but NOT while driving or using heavy machinery).

Hemi-Sync® Metamusic® Atmospheres

Atmospheric Metamusic® combined with Hemi-Sync®.

Metamusic® Atmospheres is a new category to our product line, and features relaxation or meditation atmospheric music mixed with audio technology Hemi-Sync® for an enhanced experiential journey. While some of our Metamusic titles include atmospheric music, Metamusic Atmospheres titles contain atmospheric music exclusively. The absence of a discernible melody line lends itself to unreserved exploration, often enabling the listener to fall deeper into the frequencies for what is sometimes a more profound relaxation and meditation experience.

Hemi-Sync® Mind Food®

Achieve brain synchronization with verbal guidance and sound wave methods. Mind Food® audio exercises do not contain music.


These selections incorporate verbal guidance and/or subtle sound effects along with specially blended Hemi-Sync® frequencies and sound patterns designed to help you achieve and sustain synchronized brain wave activity in both hemispheres of your brain. As with Metamusic® recordings, Mind Food® selections are available for a wide variety of uses ranging from mindfulness meditations or focused attention to stress management and sleep enhancement, or for other practical everyday applications.

Hemi-Sync® Human Plus®

Human Plus®, or H-Plus® is a means of utilizing the immense power of the subconscious to affect change in your life.


Each H-Plus (or Function) exercise contains precise combinations of Hemi-Sync® frequencies that gently draw you into an extraordinarily receptive, whole-brain state while establishing the Access Channel – the ultimate communication channel to all levels of awareness – mental, physical, and emotional. By design, the Access Channel is opened during each Function Exercise, allowing you to learn a different Function Command (short, verbal cue) ranging from controlling your appetite to increasing your energy. Once the Function Command has become encoded while the Access Channel is open you can then call upon or “activate” that Function at any time, on demand, in everyday life situations. The H-Plus series offers a different kind of pathway to new levels of freedom – to becoming Human Plus.

Hemi-Sync® Series

These titles include multiple brain sync exercises in a series designed for specific applications.


All include verbal guidance exercises mixed with Hemi-Sync® binaural beats and subtle sound effects or background music.

Hemi-Sync® Gateway Experience®

Mind Awakening albums that help you achieve expanded awareness.


The Gateway Experience® In-Home Training Series is dedicated to developing, exploring and applying expanded states of awareness. Beginning with Discovery, there are six “albums” called “Waves of Change.” Each Wave (6 guided exercises) contains special Hemi-Sync® exercises designed to gently lead the listener into deep states of expanded awareness. While in such states, one has available a broader range of perceptions with which to solve problems, develop creativity or obtain guidance. Each album is progressive in nature, building on the tools and techniques from the previous albums. Therefore, the albums must be used sequentially. The Gateway Experience Guidance Manuals, included with each Wave, prepare you for these exercises which help you to know and better understand your total self so you might enjoy a more fulfilling life.




In 2008, The Monroe Institute began to investigate a complementary method of producing the consciousness altering effects of Hemi-Sync®, a safe and effective essential component of our educational programs for decades. We were looking for an audio support technology that would extend the range, scope and flexibility of our seminar programs and educational materials. The new Spatial Angle Modulation Technology™ (SAM) was developed to meet those needs. SAM will not replace existing Hemi-Sync® products or programs, but will hopefully provide the platform for future seminar programs and educational materials.

The SAM audio support technology was developed within the context of contemporary scientific revelations about consciousness and neural microtubules which, based on a quantum mind hypothesis, supposes that consciousness consists of a series of discrete events or objective reductions (at +/- 40Hz) of the quantum wave function within neural microtubules. We experience these as a continuous flow of consciousness, as do we individual frames in a movie; our consciousness appears continuous because the frames are happening in rapid succession.

spatial angle modulation

Once modern science uncovered what appears to be a neurological basis for personal experiences such as intuition, inspiration, revelation, transcendence, ESP, NDE, etc., we set about developing an advanced sound technology founded on this new understanding. The result of this effort is an innovation based on the established principles of acoustic resonance and fits well into our long history of audio guidance systems.

Rather than binaural beating to achieve its effect, Spatial Angle Modulation™ (SAM) uses a single frequency tone digitally movement-modulated for presentation in a stereophonic field. Using stereo headphones or speakers, the spatial angle of the apparent sound source moves more rapidly than the brain can process as a Doppler shift anomaly. As a result, the brain produces a modulation or change in the tone – a tremolo effect similar to binaural beating. It is this tremolo effect coupled with the size and orientation of the movement arc produced that give SAM its ability to influence regional brain activity and changes in states of consciousness.

In practice, multiple signals (SAM arcs at different frequencies and locales) may be presented simultaneously. In addition to controlling the nominal frequency of the sound source and the frequency at which the arc effect is produced, there are several other parameters that can be adjusted to control spatial aspects of the signal and its measurable effects on regional neural activity and consciousness.

spatial arcs

Because microtubules exhibit resonance at specific audio frequencies (see article here, and the references there in), it was possible to develop a system of resonant SAM wave patterns to align microtubule cellular structures (viz. the Cymatic effect). This necessarily alters the geometry of zero-point-field (ZPF) spaces (plenums) at molecular and atomic levels within selected regions of the brain. As the geometric symmetry of the plenums increase, so does ZPF quantum coherence; both within plenums and between geometrically matching plenums. The greater the quantum coherence quotient, the more non-local awareness emerges or what one might call experiential quantum entanglement, the gate key to non-local awareness.

The SAM audio support technology provides a means of inducing altered states of consciousness ranging from deep relaxation to expanded perceptual abilities and other “extraordinary” states. When SAM is combined with other sensory-information techniques (such as sitting in a darkened room), social-psychological conditioning tools (such as group communitas), and educational curriculum (in which new cognitive, “consciousness expansion” skills are learned), it has the ability destabilize the ongoing baseline state of consciousness (usually the normal waking state). And, as the process continues, the SAM stimuli are modified and become patterning forces to engender various altered states of consciousness. Eventually, a new self-stabilized structure (the desired altered state of consciousness) forms and is supported by SAM thus providing access to a variety of beneficial applications and personal experiences of expanded states of consciousness.

Another way to picture all this, illustrated with the movie frame metaphor above, is that with the SAM quantum mind technology we will be able to alter the frame exposure rate for perceived local reality (+/- 40Hz), the interlude between frames (when you are entangled with all space/time), and the exposure period for both perspectives. With this new technology, you may be able to move across the “bridge to other reality systems” and integrate your experiences there, craft a genuinely meaningful life, realize your true Self and, thereby, benefit all of humankind.

We believe that the objective evidence for SAM’s effectiveness in facilitating enhanced states of awareness will be shown in ongoing studies of gamma synchrony as an electrophysiological correlate of consciousness itself.

Focus™ Levels

Focus™ Levels

States of Consciousness and Focus™ Levels

As a result of extensive experiential and brainwave research at The Monroe Institute, a simple system of labels (called Focus Levels) was devised to indicate various states or phases of consciousness. These labels are a means of neutral identification, and are used extensively as part of the training process throughout our weekend and week-long experiential programs.

Focus 1 – Normal, everyday waking consciousness.  Completely in phase with physical matter reality.  Also referred to as “C1 Consciousness”.

Focus 10 – The physical body is deeply relaxed while the mind remains conscious, awake and alert. “Mind awake, body asleep.”

Focus 11 – The Access Channel – the ultimate communication channel to all levels of awareness -mental, physical, and emotional.  Opened during each Human Plus® exercise.

Focus 12 – A state of expanded awareness while the body remains deeply relaxed and asleep.

Focus 15 – A state of No-Time. Consciousness is now far removed from physical body signals. Linear time is no longer relevant to experience.

Focus 21 – On the very edge of perception of the time/space continuum. Mind remains fully conscious and active.

Focus 22 – On the border between time/space and non-physical states of being. Comatose.

Focus 23 – The condition in which an individual may find him or herself immediately following physical death.

Focus 24 – The site of non-physical activity generated by simple or primitive religious or cultural beliefs.

Focus 25 – The expression of the major organized religious beliefs in recent human history.

Focus 26 – Here are identified certain areas, few in number, containing the structures and knowledge of various highly individual religious and other beliefs based on direct experience of self.
(Focus Levels 24 to 26 are referred to as the Belief System Territories, and are explored extensively during the Lifeline program)

Focus 27 – The edge of human thought capacity. The site of a way-station (not a terminus) for rest and recovery from the trauma of physical death.

Focus 34/35 – The area of the Gathering. Beings from many other locations within the physical universe are gathered here to witness the upcoming Earth Changes. First mentioned in Bob Monroe’s second book, Far Journeys.

Focus 42 – I-There cluster consciousness.

Focus 49 – Sea of I-There clusters.

Robert Monroe discusses phasing: