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In neurology, retrograde amnesia (RA) is the inability to access memories or information from before an injury or disease occurred. [1] RA differs from a similar condition called anterograde amnesia (AA), which is the inability to form new memories following injury or disease onset. [ 2 ]
Individuals with retrograde amnesia may partially regain memory later, but memories are not regained with anterograde amnesia because they were not encoded properly. [ 8 ] The term "post-traumatic amnesia" was first used in 1940 in a paper by Symonds to refer to the period between the injury and the return of full, continuous memory, including ...
Diagnoses of psychogenic amnesia have dropped since agreement in the field of transient global amnesia, suggesting some over diagnosis at least. [16] Speculation also exists about psychogenic amnesia due to its similarities with 'pure retrograde amnesia', as both share similar retrograde loss of memory. [7]
There is also often the loss of, or impaired ability to access, recent past memories (retrograde amnesia). Retrograde amnesia is typically patchy, and may affect the hours, days, months or even ...
There is no universally accepted diagnostic criteria for TGA, however proposed diagnostic criteria include: the absence of seizures, the absence of a head injury, symptoms that resolve within 24 hours, and the dysfunction or impairment being limited to amnesia (both retrograde and anterograde). [4]
Having longer periods of amnesia or consciousness after an injury may be an indication that recovery from remaining concussion symptoms will take much longer. [ 34 ] Dissociative amnesia results from a psychological cause as opposed to direct damage to the brain caused by head injury, physical trauma or disease, which is known as organic amnesia.
Anterograde amnesia is one type of memory loss where people have difficulty forming new memories after the amnesia-causing event. Having a hard time remembering recent events? You may have a type ...
Amnesia is an abnormal mental state in which memory and learning are affected out of all proportion to other cognitive functions in an otherwise alert and responsive patient. [5] There are two forms of amnesia: Anterograde amnesia and retrograde amnesia, that show hippocampal or medial temporal lobe damage.