As one treads the path of yoga, or any other mind expanding system, the body and mind become progressively purified. This also includes the brain. Furthermore, dormant nervous pathways are opened up to take greater flows of nervous impulses; this occurs in conjunction with the modification of the pranic pathways within the human framework. Sirshasana helps to open up these brain channels and to facilitate the expanding of brain capacity. The capacity of the brain is heightened in order to receive and cope with more intense flows of energy and awareness. The brain becomes a more efficient instrument.
Sirshasana and meditation
Sirshasana improves the blood flow to the pineal gland. Compared to other organs of the body, this tiny gland has the second largest blood supply per unit weight (first is the kidneys). Stimulation of this gland, by improving the blood flow or otherwise, helps to increase awareness of the more subtle realms of your being. Sirshasana directly stimulates this gland and thereby intensifies awareness. As such sirshasana if done for prolonged periods of time can be considered as a meditative practise in its own right. Because of other factors, however, we don’t suggest that you practise sirshasana for more than a few minutes without guidance. Therefore, you can use sirshasana, practised for short periods, as a method of intensifying awareness and making perception more subtle in preparation for other traditional meditative techniques.
The brain is a switching station between your individuality and the more subtle layers of the mind. The more efficient the brain becomes the more able it becomes to tune in with more subtle layers of existence. In this sense we say that each individual has vast untapped potential. All yogic practices, and in particular sirshasana, gradually make the brain more sensitive.