Rates of forgetting in normal ageing: a comparison with dementia.

ABSTRACT

This paper examines the effect of normal ageing on the forgetting rate of visuo-spatial material in a sample of 74 subjects, aged between 16 and 83. It finds that normal ageing produces a mild acquisition deficit as well as a significant increase in the forgetting rate; and it demonstrates that the relatively rapid rate of forgetting in the elderly cannot be accounted for by differences in the initial level of acquisition. The present result is contrasted with that obtained in studies of dementia and the Korsakoff syndrome, which have demonstrated a profound acquisition deficit but a normal forgetting rate once initial learning has been accomplished. Possible explanations of these differing patterns of results are briefly considered.