Retrograde amnesia

Retrograde amnesia

SignSymptom infobox
Name = Retrograde amnesia
ICD10 = ICD10|R|41|2|r|40
ICD9 = ICD9|780.9

Retrograde amnesia is a form of amnesia where someone will be unable to recall events that occurred before the onset of amnesia. The term is used to categorise patterns of symptoms, rather than to indicate a particular cause or etiology. Both retrograde amnesia and anterograde amnesia can occur together in the same patient, and commonly result from damage to the brain regions most closely associated with episodic/declarative memory: the medial temporal lobes and especially the hippocampus.

Retrograde amnesia can also be divided into two categories: temporally graded retrograde amnesia and flat retrograde amnesia.

Retrograde amnesia is caused by trauma that results in brain injury. Critical details of the physical changes in the brain that cause retrograde amnesia are still unknown. Retrograde amnesia is often temporally graded, meaning that remote memories are more easily accessible than events occurring just prior to the trauma (Ribot's Law). [] Events nearest in time to the accident that caused memory loss may never be recovered.

A person who has suffered this injury will often feel as if the time (1-4 hours) before the injury were a dream. If someone informs the injured person of the events just before the trauma, they will most likely recollect some of the happenings.

The memory loss may just affect specific “classes” of memory. For instance, the victim, a concert pianist before, may still remember what a piano is after the onset of retrograde amnesia, but may forget how to play. The relearning rate for often used skills such as typing and math is typically faster than if they had never learned it before. While there is no cure for retrograde amnesia, “jogging” the victim’s memory by exposing them to significant articles from their past will speed the rate of recall.

The victim of retrograde amnesia may feel embarrassed or stressed that they no longer remember key people and significant events. Typically the victim may be overwhelmed by the rush of well-wishers who seek to reacquaint themselves. It is important to let the amnesiac go at his or her “own pace,” so they are not overly stressed. Forgotten relations forget that they are effectively meeting the victim for the “first time” and may make the victim uncomfortable through displays of friendship such as kissing or slapping on the back that, while appropriate for longtime relationships, are not appropriate for “first time” meetings.

ee also

* Anterograde amnesia

External links

* [ Journal of Neuroscience]

Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • retrograde amnesia — n. amnesia for events that happened just before the injury, shock, etc. which caused it …   English World dictionary

  • Retrograde amnesia — Amnesia in which the lack of memory relates to events occurring before a traumatic occurrence. * * * inability to recall events that occurred before the actual onset of amnesia; loss of memories of past events. Cf. anterograde a …   Medical dictionary

  • retrograde amnesia — noun The loss of memories from the period leading up to the amnesic episode See Also: amnesia, anterograde amnesia …   Wiktionary

  • retrograde amnesia — 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… …   Dictionary of sociology

  • retrograde amnesia — noun loss of memory for events immediately preceding a trauma • Hypernyms: ↑amnesia, ↑memory loss, ↑blackout * * * a memory disorder characterized by an inability to remember events or experiences that occurred before a significant point in time …   Useful english dictionary

  • retrograde amnesia — a memory disorder characterized by an inability to remember events or experiences that occurred before a significant point in time. [1930 35] * * * …   Universalium

  • Retrograde — may refer to: * Retrograde signaling, in neuroscience * Retrograde, a type of musical permutation * Retrograde and direct motion, the movement of an astronomical object * Retrograde ejaculation, in medicine * Retrograde menstruation occurs… …   Wikipedia

  • Amnesia — Infobox Disease Name = Amnesia | Caption = DiseasesDB = ICD10 = ICD10|R|41|3|r|40 ICD9 = ICD9|780.9, ICD9|780.93 ICDO = OMIM = MedlinePlus = eMedicineSubj = eMedicineTopic = MeshID = D000647 Amnesia (from Greek polytonic|Ἀμνησία ) is a condition… …   Wikipedia

  • Amnesia — An impairment or lack of memory. Amnesia after a trauma event can be either antegrade (lack of memory related to events occurring after the event) or retrograde (lack of memory related to events occurring before the event). * * * A disturbance in …   Medical dictionary

  • retrograde — 1. Moving backward. 2. Degenerating; reversing the normal order of growth and development. [L. retrogradus, fr. retro + gradior, to go] * * * ret·ro·grade re trə .grād adj 1) characterized by retrogression 2) affecting a period immediately prior… …   Medical dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”