Kundalini.Tantra.by.Satyananda.Saraswati

cerebrospinal fluid moves through the vertebral column, it alters the phases of
consciousness and this is a very important process as far as evolution is concerned.
It is the chitta or consciousness which undergoes evolution in man. Chitta does
not have a location point in the body, it is psychological in nature, but it is controlled by
the information supplied by the indriyas or senses. While chitta is being constantly
supplied with information, its evolution is blocked, but if you prevent the passage of
information from the indriyas, chitta will evolve very quickly. That is to say, if you
isolate chitta from the information being relayed through the eyes, nose, ears, skin and
tongue, chitta is then compelled to experience independence.
When the cerebrospinal fluid is affected during pranayama, the senses become dull
and their messages are relayed to chitta very slowly. Sometimes, when the cerebrospinal
fluid is highly stimulated, all sensory impulses are suspended and experiences take place
within the chitta. Sometimes these experiences are fantastic, you might see light, feel the
whole earth trembling or experience your body as if it were as light as a piece of cotton.
These and others are the experiences of chitta as a consequence of the cerebrospinal
fluid's reactions.