Wednesday, September 17, 2008

Online video blogs

Living with amnesia
Different parts of our brains have been reportedly affected by memory loss. When the hippocampus and temporal lobe are damaged old memories stay but new memories can't be retained. All cognitive skills remain . The hippocampus does not hold new memories it only combines with other parts of the brain to create the new memories. LTP is an electrical charge that stimulates new synaptic transmission which is known to be found in the cerebral cortex. The research scientists have done to prove this hypothesis is as follows, lab rats are placed into a round pool and are trying to find a platform hidden in the murky waters. When they find that platform, researchers find that no matter how many times the rat is placed in different areas of the pool they can always find the platform again. But when these rats are given a drug to suppress their hippocampus the rats just swim around in circles because they have no memory of the platform that saves their lives.

Living without memory part 1
Clive wearing had a history of seizures that ultimately caused him severe damage to his temporal lobes and hippocampus. before this accident Clive was a musician with a beautiful voice but now he can't remember something that happens two minutes ago.He writes in his diary that he is finally awake and that he is alive. He constantly checks his watch to make an accurate account of when he is awake. But when an average person looks in his diary they see the same entries over, and over again. He forgets that he had just written the same words two minutes ago. When his wife tries to convince him that he has written the entire diary he becomes embarrassed and frustrated at his disability. Yet some things in his life remain the same, he can still sing and perform with musical instruments as well as be in love with his wife.

The Locus of learning and memory
many scientists have challenged themselves to discover what parts of the brain are involved in memory. One of the first was a man named Carl Ashley. His experiments involved removing parts of the brain to see what effect it had on the patient. He found that removing small parts had not effect at all, but removing large parts caused severe memory problems. His conclusion was that there were more than one parts of the brain that helped to store memories. Another scientist Dr. Penfield stimulated places in the temporal lobe and then removed certain pieces to see the effect on the patients. A lot of his patients had no negative results but some were awake during the stimulating reported hearing and seeing strange things as if it were normal. These studies were never published because Dr.Penfield never had valid scientific proof. But in actuality both men were in a way right there is no store house for memories. everything is biologically stored with help from the hippocampus and the cerebral cortex.

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