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Area of Science:

  • Cognitive psychology
  • Neuroscience of aging
  • Human memory

Background:

  • Cognitive aging research shows stable semantic long-term memory (LTM) retrieval in older adults.
  • Working memory (WM) function may decline with age, impacting information maintenance.
  • Expertise may influence cognitive aging trajectories.

Purpose of the Study:

  • To investigate how older adults' expertise supports working memory (WM) by mitigating age-related deficits.
  • To examine if acquired knowledge aids WM binding speed or relies more on LTM.
  • To compare younger novices, older novices, and older experts on a WM binding task.

Main Methods:

  • Participants completed a two-block working memory (WM) binding task with bird images and words.
  • Task involved immediate testing of bird recall with target, lure, and distractor options.
  • Stimuli included expertise-relevant (birds) and expertise-irrelevant (scrambled birds) conditions.

Main Results:

  • Older experts did not show faster working memory (WM) binding than older novices in Block 1, regardless of stimulus type.
  • In Block 2, older experts demonstrated an advantage in binding memory parameter estimates when long-term memory (LTM) was reliable (low proactive interference).
  • Expertise benefits WM in older age by facilitating LTM contributions rather than improving WM binding speed.

Conclusions:

  • Expertise in older adults may compensate for working memory (WM) decline by leveraging semantic long-term memory (LTM).
  • The findings suggest a shift towards LTM reliance for cognitive tasks in older experts.
  • This highlights the role of acquired knowledge in maintaining cognitive function during aging.