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Short-term and Long-term Memory
A well-established distincation in memory theory is that between short-term and long-term memory.The former refers to our ability to do such things as remember telephone memory.The former refers to our ability to do such things as remember telephone numbers long enough to dial them;the latter concerns the wide range of ways in which experiences can affect behavior many years later.Giver the two different kinds of ability,it isreasonable to hypothesize that each is represented differently in the brain.An experiment was designed to test the hypothesis that long-term memory implies a chemical change in the brain cells while short-term memory involves patterns of impulses in circuits of nerve cells.
One group of rats was taugh to run through a maze.Five minutes after learning the task,they were cooled to 50C.the temperature at which all electrical activity in the brain ceases.They were then kept at this temperature for 15 minutes before being allowed to return to their normal temperature.
They were then run through the maze again.A second group of rats were taught to run the same maze,and then immediately cooled to 50C.for 15 munutes.After being allowed to return to their normal temperature,an attempt was made to run the second group through the
maze again.It was found that rats in the first group had no difficulty with the maze the second time,suggesting that they did not have to relearn the task.Rats in the group which was cooled immediately after learning the maze, on the other hand,could not negotiate the maze successfully,i.e. they apparently could not remember what they had learned.
It was concluded from this experiment that short-term memory is unlike long-term memory.short-term memory involves electrical impulses since at a temperature where electrical activity ceases,there is no memory.Long-term memory, in contrast, is unaffected by the disruption of electrical activity and may involve
structural changes in brain cells.
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