Considering that most of the readers would be familiar with the four (now five) levels of mind (aka states of mind) this article is relative concise – yet necessary, since the subsequent article on this very blog requires a more-than-sketchy understanding of this subject.
A brainwave (not
the bright ideas that management gurus talk about) is simply put – an electrical
impulse in the brain. They are produced
by synchronised electrical pulses from bunches of neurons (the latest estimate is there are about 100 billion of them in the brain)
communicating with each other. Whether there is a thought, emotion or behavior,
the primary action is communication between the neurons within our brains.
Brainwaves are detected by placing specific sensors on
the scalp and measured using an electroencephalogram (EEG) which records the
electrical activity of the brain. They are divided into bandwidths to describe
their functions (below), but are best thought of as a continuous spectrum of
consciousness; from slow, loud and functional - to fast, subtle, and complex.
Like sound frequencies, brain waves are measured in
Hz, or cycles per second (cps). These
have been classified into five different types (or levels of mind) – four at
first, with a fifth level being added in the past decade or so. The four levels of mind documented are beta,
alpha, delta and theta. Gamma has been
the fifth (and recent) addition, very little is known as yet and it is being
researched, however I do have a theory of sorts which I have put forth in this
article for your perusal.
The higher the frequency of your brain waves, the
higher is the level of mind and vice versa.
The higher the level of mind, the higher is the conscious activity (or
hyperactivity). Generally, the slower
the frequency of your brain waves, the more relaxed you feel. A lower level of
mind is a healthier level of mind and meditation, neurofeedback, hypnosis, and
guided imagery have all been shown to help people control their brain waves
more efficiently for better health, greater performance, and a more positive
experience of life.
Level
|
CPS
(Hz)
|
State
|
Gamma
|
26-40+
|
Superconscious?
|
Beta
|
14-26
|
Awake & Outer-conscious
|
Alpha
|
7-14
|
Awake & Inner-conscious
|
Theta
|
4-7
|
Sleepy & subconscious
|
Delta
|
0-4
|
Unconscious
|
The Beta state which is our normal state as adults
during most of our waking hours, is where the brain operates at the highest
frequency, except for the Gamma state of abnormally high brain activity. This is the state where we are awake and
alert or perhaps have taken some drugs or chemicals such as benzodiazepines or
caffeine. It is essential for our
survival and our day to day activities to a certain extent. Note that being
awake does not mean you are attentive.
The Alpha state is associated with a relaxed,
daydreaming state of mind. As children,
until the age of 7 or 8, we would have been in this state 80% of our waking
hours, but this keeps reducing until as adults, we probably spend only 20% of
our waking hours in this state of mind.
As mentioned earlier, Nirmiti Nidra,
meditation techniques, pranayama, neurofeedback, progressive muscle relaxation,
hypnosis and guided imagery all lead you to this stage of relaxation. In fact, the Alpha state is the gateway to
all of them, whereby a few of them including Nirmiti Nidra
can lead you to a deeper state of mind, called Theta. The Alpha state is also
considered by almost all experts to be the initial link between the conscious
and the subconscious mind.
The Theta state, the state in which most little
children and newborns are, is associated with deeper states of meditation, spiritual
experiences or higher states of consciousness.
The subconscious mind is predominant whereas the conscious mind retreats
significantly. Intuitive insights are
common (for example, Mozart is known to have stated that a composition would
come to him all at once with complete clarity and in its entirety when he was
in a deep contemplative or meditative state; all he had to do was write it down
on paper). This state is also associated
with the REM state of sleep, where dreams occur and considered a reservoir of
creativity, waiting to be tapped into.
The Delta state is the sleep state, where there is
little or no conscious activity. Only
the unconscious rules. Delta waves adjourn
external awareness and are the source of empathy. Healing and regeneration are said
to be stimulated in this state, which is perhaps why deep restorative sleep is
so much of a prerequisite to any healing process. If the Alpha state is the link
to the subconscious, the Theta state is the bridge helping you cross over to
the subconscious, and the Delta state (if adults could achieve this) is the
bridge that helps you cross over to the collective unconscious (as Carl Jung calls
it).
The Gamma state was hitherto unknown since analog EEG
was restricted to measuring and recording rhythyms upto 25 Hz. With the onset of digital EEG, higher
frequences could be measured and recorded.
Although the earliest known case appears to be in 1964, it did not get
much attention until about a decade ago.
A lot of research is currently undertaken and not much is known about
this state.
Gamma brainwaves are the fastest of brain waves and
relate to simultaneous processing of information from different brain areas. Yet,
the mind has to be quiet to access it, and not agitated as in the case of the
Beta state. This means that quieting the
mind or attaining deepest levels of meditation/relaxation could actually
trigger off a Gamma state. Some
researchers have speculated that Gamma relates to expanded consciousness. Researchers
have also found that it is associated with bursts of insight and high-level
information processing.
A 2004 study of Tibetan Buddhist monks, who were
long-term practitioners of meditation revealed that, when the monks were told
to generate an objective feeling of compassion during meditation, their brain
activity began to fire in a rhythmic, coherent manner, suggesting neuronal
structures were firing in harmony. This was observed at a frequency of 25–40 Hz,
the rhythm of gamma waves. These gamma-band oscillations in the monk’s brain
signals were the largest seen in humans.
All of the above seem to suggest that the Gamma state
(when attained) possibly leads to superconsciousness or universal consciousness
or spiritual ascension, but neuroscientists are not necessary convinced.
Four curious points you may wish to particularly note:
You cannot attain an Alpha state
deliberately with your eyes open. It is only with your eyes closed, yet being alert
that you attain Alpha. However, there
are certain occassions where you can be in Alpha whilst watching TV or a movie,
during which you may experience ’spontaneous imagery’. Another example is in an ATM queue (not
uncommon these days) you are staring at something whereas your mind is focussed
elsewhere – this is also a state of Alpha. Boredom or daydreaming with eyes
open can also lead to Alpha. Under hypnosis and Nidra, you can attain Alpha
with your eyes open.
You are alert in both Beta and Alpha. However, in
Beta, your attention often drifts or wanders, in Alpha it is more focussed
with occassional lapses and in Theta, it is extremely focussed.
Time distortion occurs as you
get into deeper, healthier states of mind. In Alpha, you
have already lost some sense of time, in Theta – you would have no clue
whatsoever. You may think that a few
minutes have passed whereas it could easily be an hour.
One of the early researchers, Elmer Green of the
Menninger Clinic in Kansas, used biofeedback instruments to study Eastern
yogis. He discovered that certain yogis could control their internal states
merely through meditation and thought. The one thing their subjects had in
common when they were controlling involuntary body functions, was that they were in the alpha or theta states of
mind.
There is no doubt at all that Alpha and Theta states
are the gateways to your subconscious mind. Once you have accessed it in these
states, your subconscious mind willingly accepts suggestions and commands. Suggestions
and commands to your subconscious mind are maximum in Theta, optimal in Alpha
and relatively ineffective in Beta.
The author, Rajesh Seshadri, is an internationally
recognized Certified Leadership Coach, Certified Success Coach and Certified
Life Coach. He is also a NLP Master
Practitioner, facilitator and therapist.
The basket of therapies is holistic and integrative adopting techniques
from Psychotherapy, NLP, Silva, Gestalt, Hypnosis and Silva UltraMind.
Additionally, he is a seasoned corporate professional who continues to serve as
a whole-time Director and Board Member. You can contact him here.
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