THall...Perseveration According to psychology, psy
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According to psychology, psychiatry, and speech-language pathology, is the repetition of a particular response (such as a word, phrase, or gesture) regardless of the absence or cessation of a stimulus. It is usually caused by a brain injury or other organic disorder.
THall...Delusion
A belief or altered reality that is persistently held despite evidence or agreement to the contrary, generally in reference to a mental disorder.
e.g. A patient has a piece of total paper in their hand but they are convinced it is the original, authentic Declaration of Independence. The go forth day in day out telling everybody about the treasure they hold in their hand.