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- Delta, up to 4 Hz
- Theta, 4-7 Hz
- Alpha, 8-12 Hz
- Beta, 12-30 Hz
- Gamma, 25-100 Hz
The optional iSLRS system can be used with any iMRS. Utilizing AVE frequencies the iSLRS can entrain all brain wave frequencies noted above except Gamma. The iSLRS allows the user to choose one of three different color schemes to stimulate the brain in the promotion of normal, balanced electrical activity. This is becoming progressively more important as we are exposed daily to neurotoxins (e.g., fragrances in shampoo, lotions, deodorant, perfumes, air fresheners, fabric softeners, and outside pollutants), poor nutrition, stress, and sleep deprivation.
The visual stimulus delivered by the iSLRS is comprised of a series of computer-generated light signals that vary their pattern and frequency over time. During a normal iMRS session the user wears specialized goggles (with eyes shut) to receive these signals. The auditory stimulus is similarly comprised of a series of computer-generative acoustic signals that vary with time. These signals are received through headphones.
Delta is the frequency range up to 4 Hz. Delta Frequencies: It induces deep sleep and increase sleep cycle stability. In Delta brain wave activity consciousness completely internalizes. This brain wave frequency is excellent for cell regeneration activities of the body.
Technical discussion: Delta waves tend to be the highest in amplitude as well as the lowest in frequency. Delta waves are normally observed in adults in slow wave sleep. They are also seen normally in infants. Focal Focal Delta waves occur with subcortical lesions, and in more general distribution with diffuse lesions of the brain, with metabolic encephalopathy (e.g., hydrocephalus or deep midline lesions). Delta waves are most prominently measures in the frontal lobes of adults (e.g. FIRDA - Frontal Intermittent Rhythmic Delta) and in the posterior cerebral lobes in children (e.g. OIRDA - Occipital Intermittent Rhythmic Delta).
Theta is the frequency range from 4 Hz to 7 Hz. Theta brain wave patterns are associated with total relaxation and an increase in intuition and creativity. Theta wave entrainment is excellent for end-of-the-workday relaxation. These waves help to relax the brain at a deeper level, but not in a way that induces sleep. Theta is a creative state that does not keep a point of focus. Thoughts in Theta are visual and emotional as opposed to rational.
Warning: Persons with post-traumatic stress disorder or a history of mental and/or emotional trauma should consult their doctor or license health care practitioner prior to using the iSLRS. Theta wave entrainment may initially bring up old traumatic memories in such persons.
Technical discussion: Theta is seen normally in young children. The Theta frequency range is associated with reports of relaxed, meditative, and creative states. It may be seen in drowsiness or arousal in older children and adults; it can also be seen in meditation. Excessive age-appropriate Theta wave patterns represent abnormal activity. These abnormal patterns can be seen as a focal disturbance in subcortical lesions from trauma, and can be seen in generalized distribution in diffuse brain disorders, metabolic encephalopathy, deep midline disorders, and in some instances of hydrocephalus.
Alpha is the frequency range from 8 Hz to 12 Hz. These brain wave frequencies are slower, promoting relaxation without losing the ability to focus. Alpha is the most important relaxation frequency to calm down, relieve stress and anger symptoms, and to reduce pain. It also reduces circulating cortisol levels. Alpha waves are excellent for an after lunch break on the iMRS to activate the parasympathetic nervous systems, and give the brain a rest from morning activities.
Technical discussion: Alpha activity in the 8–12 Hz range seen at the back of the head on both sides. It is higher in amplitude on the dominant side. It is brought out by closing the eyes and by relaxation. This brain wave pattern weakens and subsides with eye opening or mental exertion. Alpha activity is now referred to as "posterior basic rhythm," the "posterior dominant rhythm" or the "posterior alpha rhythm." The posterior basic rhythm is actually slower than 8 Hz in young children (therefore technically in the theta range). In addition to the posterior basic rhythm, there are two other normal alpha rhythms that are typically discussed: the mu rhythm and a temporal "third rhythm". Alpha can be abnormal; for example, an EEG that has diffuse alpha occurring in coma and is not responsive to external stimuli is referred to as "alpha coma".
Beta is the frequency range from 12 Hz to about 30 Hz. These frequencies activate the body and mind. These faster frequencies are necessary for cognitive functions such as concentration and memory. Entraining beta waves are excellent for abnormal states of low arousal, and for calming an over-active mind.
Warning: Persons who suffer with states of anxiety, mental instability, frequent headadche or migraine headache should consult their physician or licensed health care practitioner before using the iSLRS. Beta wave entrainment may enhance such states.
Technical discussion: Beta waves are usually seen on both sides in symmetrical distribution. They are most evident in the frontal lobe. Beta activity is closely linked to motor behavior and is generally attenuated during active movements. Low amplitude beta with multiple and varying frequencies is often associated with active, busy or anxious thinking and active concentration. Rhythmic beta with a dominant set of frequencies is associated with various pathologies and drug effects. It may be absent or reduced in areas of cortical damage. It is the dominant rhythm in patients who are alert or anxious or who have their eyes open.
In summary, the principle of Audiovisual Brainwave Entrainment is as follows: By applying a dominant external stimulus to the brain with certain frequencies (within the above mentioned ranges), the human brain has the tendency to change its dominant frequency towards the applied stimulus. Such a stimulus can be aural (binaural, monaural and isochronic), visual or even electromagnetic. Therefore the brain wave patterns can be actively influenced by these external stimuli.
