Assessing the age-related effects of proactive interference on working memory tasks using the Rasch model

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Aging Research

Background:

• Working memory (WM) span declines with age, impacting daily cognitive functions.
• Inhibition-reduction theory proposes reduced ability to suppress irrelevant information underlies this decline.
• Proactive interference (PI), where prior information hinders new learning, is a key factor in cognitive aging.

Purpose of the Study:

• To investigate the role of inhibition-reduction theory and proactive interference (PI) in age-related working memory (WM) span decline.
• To quantify the extent to which susceptibility to PI accounts for age differences in WM span.

Main Methods:

• Employed the Rasch psychometric model to analyze performance on two WM span tasks.
• Compared older and younger adults' performance, focusing on trial difficulty and susceptibility to PI.
• Statistically controlled for individual differences in susceptibility to PI.

Main Results:

• Older adults exhibited greater difficulty on later trials, consistent with increased susceptibility to PI.
• After accounting for PI, the age-related variance in WM span was reduced by approximately 50%.
• This suggests that differential susceptibility to PI is a significant, but not the sole, contributor to age-related WM decline.

Conclusions:

• Inhibition-reduction theory provides a valuable framework for understanding age-related working memory deficits.
• Susceptibility to proactive interference plays a substantial role in the decline of working memory span in older adults.
• Further research is needed to identify the remaining factors contributing to age-related working memory decline.