The stream which you feel coming down on the head and pouring into you is indeed a current of the Mother's force; it is so that it is often felt; it flows into the body in currents and works there to liberate and change the consciousness. As the consciousness changes and develops, you will begin yourself to understand the meaning and working of these things.
Pressure, throbbings, electrical vibrations are all signs of the working of the Force. The places indicate the field of action, the top of the head is the summit of the thinking mind where it communicates with the higher consciousness; the neck or throat is the seat of the physical, externalising or expressive mind; the ear is the place of communication with the inner mind-centre by which thoughts etc. enter into the personal being from the general Nature. The sternum at the point indicated holds the psychic and emotional centre, with its apex on the spinal column behind.

The current like electricity is the flowing of the force through the spine. In the Tantric system the spine is considered as the natural passage of the Force, because it is in the spine that all the six centres rest. Electric shock always indicates a passage of dynamic Force.

All that now passes lived immortal there
In the proud beauty and fine harmony
Of Matter plastic to spiritual light.
Its ordered hours proclaimed the eternal Law;
Vision reposed on a safety of deathless forms;
Time was Eternity's transparent robe.
An architect hewing out self's living rock,
Phenomenon built Reality's summer-house
On the beaches of the sea of Infinity.