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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]
There are two main types of amnesia: Retrograde amnesia is the inability to remember information that was acquired before a particular date, usually the date of an accident or operation. [3] In some cases, the memory loss can extend back decades, while in other cases, people may lose only a few months of memory.
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 ...
Retrograde amnesia (RA) is a loss of access to events and information of the past after the onset of disease or injury [1].RA is often temporally graded, consistent with Ribot's Law: more recent memories closer to the traumatic incident are more likely to be forgotten than more remote memories [2].
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 ...
Treatment attempts often have revolved around trying to discover what traumatic event had caused the amnesia, and drugs such as intravenously administered barbiturates (often thought of as 'truth serum') were popular as treatment for psychogenic amnesia during World War II; benzodiazepines may have been substituted later. [14] '
Retrograde amnesia is most marked for events occurring in the weeks or months before treatment. Anterograde memory loss usually resolves 2–4 weeks after treatment, whereas retrograde amnesia (which develops gradually after repeated treatments in the initial course) usually takes weeks to months to resolve; amnesia rarely persists for more ...
Ribot's law of retrograde amnesia was hypothesized in 1881 by Théodule Ribot. It states that there is a time gradient in retrograde amnesia, so that recent memories are more likely to be lost than the more remote memories. Not all patients with retrograde amnesia report the symptoms of Ribot's law.