Hallucinations are sensory perceptions in the absence of external stimuli. There are similar in quality to a true perception; that is, people can easly think they are real.
Auditory hallucinations are the most common. Others include visual, gustatory, olfactory, or tactile.
If people seem to be looking at something, say "what's going on?"
A good way to screen is:
"Sometimes people see/hear things that other people don't seem to notice. Does this ever happen to you?"
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