Examples: The crooked stick as a snake.
A ghost created from shadow.
An ordinary ringing in the ears as sleigh-bells.
Milk tasting like blood.
An _hallucination_ is a perception without an object.
The hallucinated individual projects, as it were, the things of his
mind's creation into the outer world, and accepts them as reality. He
sees snakes where there is nothing to suggest them; sees a ghost where
there is no shadow; believes that the taste of blood is constantly in
his mouth.
There are possible hallucinations of every sense. Nonexistent objects
are seen, touched, tasted, heard, or smelled.
_Hypochondriasis_ is a state characterized by persistent ideas of
non-existent physical disabilities.
The hypochondriac has every known symptom of indigestion, or of heart
disease, or is threatened with tuberculosis--all in his mind; and
whatever the disorder he seizes upon, his attention hovers there, while
the ideas of that particular disability persist and strengthen.
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