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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]
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.
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.
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 types of amnesia: retrograde amnesia (loss of memories that were formed shortly before the injury) and anterograde amnesia (problems with creating new memories after the injury has taken place). [5] PTA may refer to only anterograde forms, or to both retrograde and anterograde forms. [6] [7]
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.
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]
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 ...