Delirium is now the preferred term to describe acute confusional states and related organic mental disorders associated with acute impairment of consciousness (Gill & Mayou, 2000). No longer is delirium reserved for those states in which overactive behaviour, often with visual hallucinations, is dominant. To accommodate the broader usage, hypoactive states of delirium have been emphasised (Lipowski, 1990), particularly as these are the states most easily missed.
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Simon Fleminger (2002) studied this question.
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