Here again, the statement could be applied accurately to certain systems of meditation, but not to vipassana. Insight meditation is not a form of hypnosis. You are not trying to black out your mind so as to become unconscious, or trying to turn yourself into an emotionless vegetable. If anything, the reverse is true:
you will become more and more attuned to your own emotional changes. You will learn to know yourself with ever greater clarity and precision. In learning this technique, certain states do occur that may appear trancelike to the observer.
But they are really quite the opposite. In a hypnotic trance, the subject is susceptible to control by another party, whereas in deep concentration, the meditator remains very much under his or her own control. The similarity is superficial, and in any case, the occurrence of these phenomena is not the point of vipassana. As we have said, the deep concentration of jhana is simply a tool or stepping stone on the route to heightened awareness. Vipassana, by definition, is the cultivation of mindfulness or awareness. If you find that you are becoming unconscious in meditation, then you aren’t meditating, according to the definition of that word as used in the vipassana system.