Hallucination

Hallucination is the result of an extreme deprivation of outer sensation. In the same way that the lesser sensory data of cool media result in participation to fill in details, a lack of any sensory data results in extreme completion of the senses. McLuhan refers to this concept much less than he does to the opposite, somnambulism; this may imply that he sees the effects of somnambulism everywhere, but hallucination is only a logical opposite that does not come about in media studies in general.

The opposite of hallucination is hypnosis.