By Nelson Butters
• Edit date: 1980 • writer: educational Press. Inc • ISBN: 0-12-148380-0 • writer: Nelson Butters/Laird S. Cermak • Preface/Forward: by way of the authors • No. Pages: 188
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Extra info for Alcoholic Korsakoff's Syndrome. An Information-Processing Approach to Amnesia
This led them to their conclusion that decay was the principle cause of forgetting in STM. The error of their assumption was quickly pointed out by Keppel 22 2. 2 0 3 6 9 12 Recall interval (sec) 15 18. 83 sec as a function of the recall interval. and Underwood (1962), who showed that the Petersons had overlooked an important source of "interference" in their design, namely, the PI that accrued from items presented on preceding trials. Keppel and Underwood argued that because the Petersons had given their subjects several practice trials before initiating their testing procedure, a good deal of PI had been generated prior to the point at which they began to collect data.
The patient generally continues to be shown the list until he can correctly anticipate each response on one trial (or, sometimes, on two consecutive trials). The measures of learning that are usually computed are the number of trials to criterion, or the number of correct responses at the end of a fixed number of trials. The method just described as the usual method for presenting P-A's is called the anticipation method. An alternative P-A procedure is to present each pair, one at a time for perhaps 4 sec, and then to show only the stimulus member of each pair.
First, although the alcoholic Korsakoff patients' search of semantic conceptual memory is slower than normal (indicating perhaps an element of disorganized search), nevertheless, they did respond correctly as often as the normals. This again means that information learned early in life is still present and may be available as a base from which to draw inferences (see Lachman & Lachman, 1979). Second, this remote memory may have become automatic in retrievability, and this feature may be what is retained after the brain damage occurred in the Korsakoff patient.
Alcoholic Korsakoff's Syndrome. An Information-Processing Approach to Amnesia by Nelson Butters