The basis for memory recall remains an active area of study. Memory retrieval can be of two types: recognition and recall. In recognition, the individual is presented with information that had been previously learned. The subject remembers he or she has already observed or learned that information. In effect, it is analogous to seeing a movie or book for the second time. In recall, information is reproduced from memory, as in response to a question. The physiological basis for retrieval probably involves the activation of regions of the brain which were involved in the initial encoding.
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