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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 ...
Retrograde amnesia is typically patchy, and may affect the hours, days, months or even occasionally years prior to the TGA episode and is often subtle. Memory of things that happened in the more ...
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.
This characteristic of TGA, where the length of time affected by retrograde amnesia shortens (i.e. older memories return first, followed by more recent memories) is commonly seen. [4] In the majority of cases there are no long-term effects other than a complete lack of recall for this period of the attack and an hour or two before its onset.
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.
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 ...
Retrograde amnesia is defined as the loss of memory of events and experiences occurring prior to an illness, accident, injury, or traumatic experience such as rape or assault. The amnesia may cover events over a longer or only a brief period. Typically, it declines with time, with earlier memories returning first. [9]