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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 ]
Of the two effects of interference theory, proactive interference is the less common and less problematic type of interference compared to retroactive interference. [1] Previously, it had been hypothesized that forgetting working memories would be nonexistent if not for proactive interference.
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]
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 ...
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:
There are two types of interference: proactive interference (old memory inhibits the ability to remember new memories properly), and retroactive interference (new memories inhibit the ability to remember old memories accurately). Typically, more information can be remembered of recent events than older events.
In such cases, retrieval cues continue to be associated and aimed at recalling previously learned information, affecting the recall of new material. Retroactive interference is the opposite of proactive interference, in which there is difficulty in the recall of previously learned information based on the interference of newly acquired information.
This is why after a stroke people have a chance of developing cognitive deficits that result in anterograde amnesia, since strokes can involve the temporal lobe in the temporal cortex, and the temporal cortex houses the hippocampus. Anterograde amnesia can be the first clinical sign that Alzheimer's disease is developing within the brain ...