_Compulsive ideas_ are ideas which intrude, recur, and persist despite
reason and will.
Example: The compulsive idea of contamination may lead its victim to
wash and rewash his hands at every contact with matter, until finally,
though they are raw and sore, he is incapable of resisting the act.
_Disorientation_ is a state of mental confusion as to time, place, or
identity.
_Amnesia_ is pathologic forgetfulness.
Example: As sometimes found in the infection-exhaustion psychoses, when
the entire past of the patient may be wiped out for the time. Cases of
permanent amnesia are known.
_Aphasia_ is a defect in the interpretation or production of language.
There may be motor aphasia, auditory aphasia, vocal aphasia, sight
aphasia; and with disability to produce words, they may yet be
recognized when seen; or when they can be spoken they may not be
recognized when heard; or with inability to speak them, they are
accurately sensed by hearing; or though understood when heard, they are
incomprehensible when read.
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