The amnesia is the partial or total loss of memory.
It may include the result of psychological problems (possibly temporary), or a psychiatric illness or neurological nature.
Neuropsychology studying cases of brain lesions and consequences arising on memory loss of certain capacities, while others remain intact.
Anterograde amnesia (amnesia = fixing): anterograde amnesia focuses on events subsequent to the accident or sickness which caused it. The subject is unable to form new memories, he forgets the events as they progress. The situation is comparable to a computer's hard drive can read all the data it contains but whose mechanism prevents faulty writing any new registration information. From the Latin anterior, before. Antonym: retrograde amnesia, which corresponds to the loss of memory of events preceding the trauma.
Retrograde amnesia (amnesia = evocation) deficit recall information acquired before the episode pathological. Contrary to what the film suggests, it is never total (the period may be longer or shorter). In the case of dementia, a progressive moves amnesia following a gradient Ribot: The earliest memories are usually the best preserved.
Anterior retrograde amnesia
Selective amnesia: achievement of language areas with significant loss of vocabulary (often find themselves at the head injuries and emotional distress).
Patchy amnesia (amnesia gap): "memory hole" over specific periods of life.
Many diseases and accidents can cause a syndrome amnesia. Among the best known and studied:
* Korsakoff syndrome;
* Stroke and aneurysm ruptures;
* Amnesia associated with progressive dementia;
* Brain tumors.
Disorders of memory can occur outside the context of amnesic syndrome, as is the case in some severe depressions, whose clinical picture can evoke amnesia.