Patanjali was clear that a yogin has to find that gap and then hold
the attention there in order to prolong it so that the emerging idea
is prevented from manifesting. When this is done the idea-machine in
the mind, the buddhi or analytical orb, may shift into high gear and
one may be able to have supernatural or spiritual perception, thus
getting rid of the long history of spiritual ignorance and void
detection.
Patanjali super-instruction about yogah cittavritih nirodhah means
that one has to dis-empower the idea-machine but one cannot do that
unless one exploits this gap, because so long as the analytical orb is
involved with the creation and dissolution of idea, the self is
enslaved by it and cannot take command of the idea-manufacturing
psychic mechanism. And the key is to find that gap and hold on to it.
http://www.sciencedaily.com/releases/2010/01/100114103130.htm