Brain, Vol 121, Issue 5 861-873, Copyright © 1998 by Oxford University Press
RE Mark and MD Rugg
Electrophysiological correlates of episodic memory retrieval (recollection)
were investigated in a young (18-30 years) and an older group (62-79 years)
of healthy subjects (n = 16 per group). At study, subjects listened to
words spoken in either a male or a female voice, and were instructed to
perform one of two tasks depending on the voice in which the item was
spoken. At test, subjects made initial old/new judgements to visually
presented words and, for words judged old, either indicated in which voice
they had heard the word at study (source task), or whether the 'remembered'
or 'knew' they had heard the word at study ('remember/know' task). The
accuracy of the initial recognition decision did not differ between the two
groups. However, young subjects were significantly more accurate in their
source judgements than the older group. The magnitudes and topographical
distributions of differences between event related potentials to
successfully recollected words and new words were indistinguishable for the
two tasks. These event-related potential effects were also equivalent in
magnitude and scalp topography in the two age groups, the only difference
between the groups being a relative delay in the onset of the effects at
some electrode sites in the older subjects. These findings are consistent
with the proposal that the processes supporting episodic retrieval,
including those dependent upon the prefrontal cortex, are relatively
unaffected by advancing age.
ARTICLES
Age effects on brain activity associated with episodic memory retrieval. An electrophysiological study
Wellcome Brain Research Group, School of Psychology, University of St Andrews, UK.
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