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E-ISSN : 2733-4538
The present study was conducted to examine the differential effects of perceptual and semantic encodings on recall and recognition memory in elderly people with Subjective Cognitive Decline (SCD) and to compare them with those in the normal elderly (NE) and amnestic Mild Cognitive Impairment (amMCI). Computerized perceptual (number of letters) and semantic (man-made/natural) verbal encoding tests were administered. After a 20-minute delay, free-recall and recognition tests for the encoded target words were performed. At the comparison of the difference (semantic encoding-perceptual encoding) of memory performances between perceptual and semantic encodings, the NE showed a greater difference than the amMCI, but the SCD did not show any differences with either NE or amMCI. Although the amMCI showed poorer performance on both recall and recognition tests than the NE and SCD, the SCD did not show any differences in both tests with NE. At the comparison of the difference (recognition-delayed free recall) of the memory performance between the delayed free-recall and recognition, the NE showed a greater difference than the amMCI, but the SCD did not show the difference with either group. These results showed that the SCD already had subtle problems in semantic encoding and memory retrieval but with less degree than amMCI. They suggest that the SCD is an intermediate stage between the NE and amMCI.
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