"Memory is defined as the activity to remember past events, information and skills".
1. Amnesia
"Complete or partial loss of memory due to the psychological and neurological problems known as Amnesia".
TypesI. Anterograde Amnesia
It refers to difficulty in learning new information.A person with it can remember events that occured in the past during the time before the brain damage occured but can't retain information.He / She encounters after the damage or very very simply the loss of memory for events after Trauma or desease.Such kind of amnesia is caused by damage to the temporal lobe.
Scoville and Milner 1957 reported that lateral removal of the medial temporal lobe produce a memory impairments in human beings excluding temporal lobe dmageness of hypo-campus may became the source of such amnesia.
II. Retrograde Amnesia
Difficulty inability to recall past events.It refers to the inability to remember events that happened before the brain damage occured or in other word the loss of old memory prior to an event or illness.
2. Alzheimer Disease
"It is a neurological disorder / desease which is caused to deterioration of intellectual abilities resulting from an organic brain disorders. It is characterized by progressive loss of memory and other mental function".
Person forgets his appointments and person's names.his desease is produce by sever degeneration of hippo-campus. neo-cortex and especially the association cortex of the frontal and temporal lobes.Factors
1. Neuritic Plaques
2. Nero Fiberi-llary Tangles
Impair memory and learning problem at all level (encoding, storage, retrieval and retention).The brain that holds previously well semantic knowledge.Information unorganized associational frame work begin to deteriorate.
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