... forgetting therefore each requires a different explanation. Episodic memory is lost rapidly, and new information arrives and interferes. It may be that semantic memory is constantly used, and it is rehearsed. . In this essay I am going to be discussing the extent to which this dissociation claim is true using evidence from blood flow in the brain, from amnesiacs, from experimental dissociations and simple transfer. Wood et al (1975), found evidence for the distinction by a measure of the regional cerebral blood flow. They supported the distinction as significant correlations were found between accuracy of performance and blood flow in the occipital and tempral-occipital regions for the episodic recongition group, but not for subjects in the semantic recognition group. Similar findings were also reported by Tulving (1979) where he found an increase in blood flow in the back of the brain for semantic memories and in the front of ...

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