Do hallucinations cross over sensory systems?

Aren't hallucinations limited to one sense at a time (visual, auditory, tactile, olfactory)?

Example # 1. Someone would have a weird visual hallucination, with no sound or feeling to back it up. Rabbits don't usually crawl up the wall, so the person would know it was just a visual hallucination. Something weird like that would never happen in reality, so the person was seeing things.

Example # 2: The other person would have auditory hallucinations of criminals in the house, with tactile and visual hallucinations that back up the same theory. This person saw, heard, and felt something that fit into a realistic story. Do auditory, tactile, and visual hallucinations work together like that?

Answer:
Hallucinations are often accompanied by delusions (altered patterns of thoughts). While some high functioning individuals who experience psychosis may be able to actively distinguish between fantasy and reality (e.g. Crowe's character in A Beautiful Mind). If the individual is delusional, however, thinking and logic itself may be affected. Seeing a rabbit crawl up the wall might make perfect sense in the world that the individual is experiencing.

Most hallucinations are strictly auditory. Some may experience mutliple hallucinations through several sense simultaneously. The hallucinations may not strictly be related (e.g. the individual may 'see' a shadowy figure, and 'hear' a clicking sound), however the delusions which often accompany psychosis may create an association for the individual (e.g. the shadowy figure is attempting to read my mind with the 'clicks,' the figure is an alien who communicates with clicks, the clicks are God's way of telling me that the shadowy figure is the Devil).

I've associated with hundreds who suffered from psychotic symptoms. Most experienced only auditory or only visual symptoms. A few have, however, experienced simultaneous hallucinations, auditory and visual, wherein they 'saw' and 'heard' another human speaking clearly with an imagined person.
Yes they can.
It depends on what caused the hallucination. If it is caused by "normal" ways like lack of sleep or something, it's only one sense at a time. If you're on drugs then they can mix. You can see and hear the hallucination.

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