Although normally a period of meditation involving intense concentration and practice for five years or some is required to “bring up the Kundalini”, Bentov states that exposure to mechanical or acoustical vibrations in the range of 4-7 Hertz (cycles per second) for protracted periods may achieve the same effect.
In addition, according to Bentov: “The states of bliss described by those whose Kundalini symptoms have completed the full loop along the hemispheres may be explained as a self-stimulation of the pleasure centers in the brain caused by the circulation of a ‘current’ along the sensory cortex.”