Interference and facilitation in spatial working memory: age-associated differences in lure effects in the n-back...

Area of Science:

• Cognitive psychology
• Neuroscience of aging
• Human memory

Background:

• Working memory (WM) capacity significantly declines with normal aging.
• The precise neural and cognitive mechanisms driving age-related WM decline remain incompletely understood.
• Investigating age-specific responses to interference and facilitation is crucial for understanding WM changes.

Purpose of the Study:

• To examine how younger and older adults respond to lure stimuli in a spatial working memory task.
• To elucidate the role of familiarity signals in age-related working memory performance.

Main Methods:

• Utilized two versions of a 2-back spatial working memory task.
• Assessed performance in younger and older adult cohorts.
• Analyzed responses to lure items, defined as non-target items matching earlier sequence items.

Main Results:

• Older adults exhibited significantly more pronounced interference effects from lure items compared to younger adults.
• Conversely, older adults demonstrated enhanced facilitation for target items.
• These differential effects suggest a shift in cognitive processing strategies with age.

Conclusions:

• The increased susceptibility to lure interference in older adults indicates challenges in distinguishing relevant from irrelevant information.
• The observed target facilitation suggests that familiarity-based processing may become more prominent in older adults' working memory.
• Findings imply that aging alters the balance of cognitive control and familiarity-driven processes in working memory.