Changes

[[Hallucination]]s are usually defined in [[psychiatry]] as "false perceptions," that is, perceptions which arise "in the absence of an appropriate external stimulus."<ref>American Psychiatric Association. 1987. p.398</ref>

[[Lacan]] finds such definitions inadequate, since they ignore the dimension of [[meaning]] and [[signification]].<ref>{{Ec}} p.77; {{E}} p.180</ref>

[[Hallucination]]s are a typical phenomenon of [[psychosis]], and are usually auditory (hearing voices), but may also be visual, somatic, tactile, olfactory, or gustatory.

[[Lacan]] argues that [[psychotic]] [[hallucination]]s are a consequence of the operation of [[foreclosure]].

==Structure of Desire==

While [[hallucination]]s are most commonly associated with [[psychosis]], there is another sense in which they play an important part in the [[structure]] of [[desire]] in all [[subject]]s.