The relationship between epilepsy and psychosis has been recognised since the mid-nineteenth century. For pragmatic reasons, psychotic symptoms are always grouped according to their temporal relationship to seizures: ictal, peri/para-ictal and interictal psychoses (IIP). Psychoses without a clear relationship to seizures are usually defined IIP and they usually account for 10–30% of all psychoses of epilepsy in unselected case series with a combined prevalence rate of 5.6% in unselected samples, up to 7.0% when considering only temporal lobe epilepsy.
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