Every individual has many incidents stored in his memory. Memory played an extremely important part of the development of human society. Memory improvement techniques are pretty simple to learn but they require a lot of practice and constant use, otherwise there is hardly any benefits.
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Saturday, July 04, 2009


Amnesia is the inability to form new memories or in some cases to remember existing one.

Amnesia occurs when some structure of the brain – such as the hippocampus which is essential for consolidating memories – doesn’t function properly.

The malfunction can be caused by some types of stroke, chronic alcoholism, temporary lack of oxygen to the brain, or certain kinds of brain infection such as viral encephalitis.

Amnesia is also common side effect of electroconvulsive therapy for mental illness such as bipolar disorder, although the effect usually temporary.

People with amnesia don’t forget everything, and they retain their general level of intelligence.

They have a normal attention span and an form short-term memories lasting perhaps a few minutes.

Their procedural memory – which covers well established skill such as riding a bike or brushing teeth – remains intact, because these skills don’t depend on the hippocampus.

The breakdown occurs with long term declarative memories, which often depend of the hippocampus.

People will anterograde amnesia are unable to form new long term memories after the moment of an accident or the inset of illness.

People with retrograde amnesia have difficulty retrieving memories from the period of time before the amnesia began.

The duration of amnesia depends on the cause. If the disruption of brain function is temporary (as in a moderate blow to the head that causes a concussion), most of the lost memory may come back, although memories formed just before and soon after the damage occurred are usually lost forever.

There is also rare condition called transient t global amnesia (TGA). TGA refers to a brief period of time (usually hours) during which a person is able to engage in normal behavior but after which she or he does not remember the events that occurred during the period.

The cause of TGA is unknown, although damage in the limbic system has been found in some individuals.

TGA is more frequent in people who have migraine disorders. TGA does not appear to be related to later development of a more serious memory disorder such as Alzheimer’s disease.

Certain drugs and medications can also produce TGA like episodes.

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