Neural basis of dissociative amnesia

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  • Kikuchi Hirokazu
    Department of Behavioral Neurology and Cognitive Neuroscience, Tohoku University Graduate School of Medicine.

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Other Title
  • 解離性健忘の神経基盤

Description

Dissociative amnesia, also called psychogenic amnesia or functional amnesia, is a psychiatric disorder, in which patients have an inability to retrieve specific autobiographical memories. It usually follows a psychotraumatic or stressful event and is not due to any direct organic injury to the brain. Although it has been argued from a psychiatric perspective for a long time, dissociative amnesia has begun to get approached with neuroscientific techniques recently. Studies with functional neuroimaging techniques have revealed functional abnormality of dissociative amnesia at brain level. There are two theories about brain mechanisms of dissociative amnesia ; frontal executive inhibition of the medial temporal memory system, and functional disconnection of right fronto-temporal regions engaged in triggering autobiographical memory retrieval. Recent studies have reported evidence supporting each of the two theories. The aim of this review is to summarize recent neuroscientific insights into neural basis of dissociative amnesia, and to make an outline and consideration of it from a neurological view.

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