- A term used to denote a hallucination that is attributable to a focal or partial epileptic seizure, as in the *irritative type of hallucinations as envisaged by the American ophthalmologist David Glendenning Cogan (1908-1993). Focal hallucinations tend to be brief and stereotyped. Theoretically, they can affect any of the sensory modalities.ReferencesCogan, D.G. (1973). Visual hallucinations as release phenomena. Albrecht von Graefes Archiv für Klinische und Experimentelle Ophthalmologie, 188, 139-150.
Dictionary of Hallucinations. J.D. Blom. 2010.
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