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Amnesia is a deficit in memory caused by brain damage or brain diseases, [1] but it can also be temporarily caused by the use of various sedative and hypnotic drugs. The memory can be either wholly or partially lost due to the extent of damage that is caused. [2] There are two main types of amnesia:
Dissociative amnesia or psychogenic amnesia is a dissociative disorder "characterized by retrospectively reported memory gaps. These gaps involve an inability to recall personal information, usually of a traumatic or stressful nature."
Characters with memory disorders have helped to move literature and media along by allowing for suspense to be created either through retrograde or traumatic amnesia as seen in Alfred Hitchcock's Spellbound. It can also provide comic relief if a character is introduced who has short-term memory impairments.
Dissociative fugue is a mental and behavioral disorder [3] that is classified variously as a dissociative disorder, [1] a conversion disorder, [3] and a somatic symptom disorder. It is a facet of dissociative amnesia , according to the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders ( DSM-5 ).
Dissociative amnesia (formerly psychogenic amnesia): the loss of recall memory, specifically episodic memory, typically of or as a reaction to traumatic or stressful events. It is considered the most common dissociative disorder amongst those documented. This disorder can occur abruptly or gradually and may last minutes to years.
Repressed memory is a ... that would qualify as examples of memory repression or dissociative amnesia. ... stress disorder was positively ...
Korsakoff syndrome (KS) [1] is a disorder of the central nervous system characterized by amnesia, deficits in explicit memory, and confabulation.This neurological disorder is caused by a deficiency of thiamine (vitamin B 1) in the brain, and it is typically associated with and exacerbated by the prolonged, excessive ingestion of alcohol. [2]
Amnesia is seen in patients who, for the reason of preventing another more serious disorder, have parts of their brains known to be involved in memory circuits removed, the most notable of which is known as the medial temporal lobe (MTL) memory system, described below.