Episodic disorders of behaviour and affect after acquired brain injury
Among the many adverse consequences of acquired brain injury there is a group of disorders characterised by intermittent states of altered affect or behaviour. (The term “affect” is used here to indicate subjective emotional states; the term “mood” is avoided, because it tends to be used interchangeably with either emotional changes or episodes of changed behaviour, most typically anger or rage, and because these two are helpfully distinguished in understanding the disorders.) These conditions are not widely recognised and
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can be readily confused with more standard forms of affective disorders such as “depression” or anxiety on the basis of a single consultation, even by psychiatrists, unless their essentially episodic nature is elicited in taking the individual’s history.