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).
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A disturbance in the memory of information stored in long-term memory, in contrast to short-term memory, manifested by total or partial inability to recall past experiences. [G. a., forgetfulness]
- anterograde a. a. in reference to events occurring after the trauma or disease that caused the condition.
- emotional a. psychological etiology of forgetting or repression of emotion.
- lacunar a., localized a. a. in reference to isolated events.
- posthypnotic a. selective forgetting, after a hypnotic state, of events occurring during hypnosis or of information stored in long-term memory, such as one's name, address, and names of relatives.
- retrograde a. a. in reference to events that occurred before the trauma or disease that caused the condition.
- transient global a. a memory disorder seen in middle aged and elderly persons characterized by an episode of a. and bewilderment that persists for several hours; during the episode the patient has a memory defect for present and recent past events, but is fully alert, oriented, capable of high-level intellectual activity, and has a normal neurological examination. Typically, these amnesic episodes occur spontaneously, and most patients experience only one; of uncertain etiology—probably ischemic, but not due to atherosclerosis.
- traumatic a. the loss or disturbance of memory following an insult or injury to the brain of the type that accompanies a head injury, or excessive use of alcohol, or following the cessation of alcohol ingestion or other psychoactive drugs; or loss or disturbance of memory of the type seen in hysteria and other forms of dissociative disorders.

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am·ne·sia am-'nē-zhə n
1) loss of memory sometimes including the memory of personal identity due to brain injury, shock, fatigue, repression, or illness or sometimes induced by anesthesia <a period of \amnesia after the wreck>
2) a gap in one's memory <an \amnesia concerning her high-school years>

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n.
total or partial loss of memory following physical injury, disease, drugs, or psychological trauma (see confabulation, fugue, repression). Anterograde amnesia is loss of memory for the events following some trauma; retrograde amnesia is loss of memory for events preceding the trauma. Some patients experience both types.

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am·ne·sia (am-neґzhə) [Gr. amnēsia forgetfulness] lack or loss of memory; inability to remember past experiences.

Medical dictionary. 2011.

Look at other dictionaries:

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  • amnesia — /amne zia/ s.f. [dal gr. amnēsía, comp. di a 2 e mnēsis (dal tema di mimnḗskō ricordare ), attrav. il fr. amnésie ]. 1. (med.) [perdita della memoria, generale o parziale]. 2. (estens.) [momentaneo vuoto di memoria] ▶◀ dimenticanza, lacuna (di… …   Enciclopedia Italiana

  • amnesia — (n.) loss of memory, 1786 (as a Greek word in English from 1670s), Modern Latin, coined from Gk. amnesia forgetfulness, from a , privative prefix, not + mimneskesthai to recall, cause to remember, a reduplicated form related to Gk. mnemnon… …   Etymology dictionary

  • amnesia — sustantivo femenino 1. (no contable) Área: medicina Pérdida total o parcial de la memoria: La amnesia de mi padre es, de momento, muy selectiva …   Diccionario Salamanca de la Lengua Española

  • amnesia — [am nē′zhə] n. [ModL < Gr amnēsia, forgetfulness < a , not + mnasthai, to remember < IE base * men , *mnā , to think, be alert > MAN, L mens, MIND] partial or total loss of memory caused as by brain injury or by shock amnesiac [am… …   English World dictionary

  • amnesia — am*ne si*a, n. [NL., fr. Gr. amnhsi a; a priv. + mna^sqai to remember.] (Med.) Forgetfulness; also, a defect of speech, from cerebral disease, in which the patient substitutes wrong words or names in the place of those he wishes to employ. Quian …   The Collaborative International Dictionary of English

  • amnésia — s. f. Perda (total ou parcial) da memória …   Dicionário da Língua Portuguesa

  • amnesia — (Del gr. ἀμνησία). f. Pérdida o debilidad notable de la memoria …   Diccionario de la lengua española

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