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Age differences in prefrontal cortical activity in working memory.

B Rypma1, V Prabhakaran, J E Desmond

  • 1Department of Psychology, Stanford University, California, USA. rypma@socrates.berleley.edu

Psychology and Aging
|September 14, 2001
PubMed
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Aging impacts working memory (WM) performance. While ventral prefrontal cortex (PFC) activation is similar in younger and older adults, older adults show less dorsal PFC activation, suggesting age-related changes in executive WM functions.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Aging Research

Background:

  • Working memory (WM) capacity is known to decline with age.
  • Brain imaging reveals ventral prefrontal cortex (PFC) involvement in WM retention.
  • Dorsal PFC activation increases with WM load, particularly in younger individuals.

Purpose of the Study:

  • To investigate the effects of aging on prefrontal cortex (PFC) activation during working memory (WM) tasks.
  • To compare brain activation patterns in younger and older adults across different WM loads.

Main Methods:

  • Six younger and six older adults participated in the study.
  • Participants performed a WM task involving encoding, maintaining, and probing letter sets (1- or 6-letter sets).
  • Functional brain imaging was used to measure PFC activation during task performance.

Related Experiment Videos

Main Results:

  • Ventral PFC activation during memory retention was comparable between younger and older adults.
  • Younger adults exhibited greater dorsal PFC activation than older adults, especially with larger memory sets.
  • Older adults demonstrated increased rostral PFC activation compared to younger adults.

Conclusions:

  • Aging appears to selectively affect dorsal PFC regions crucial for the executive aspects of working memory.
  • These findings suggest that age-related working memory decline may be linked to alterations in specific prefrontal cortex functions.