Practice on conflict tasks promotes executive function of working memory in the elderly

Area of Science:

• Neuroscience
• Cognitive Psychology
• Gerontology

Background:

• Executive functions, including attention control and working memory, can decline with age.
• Conflict tasks, like the Stroop task, are used to assess executive function and attention switching abilities.

Purpose of the Study:

• To investigate the effects of practice on a conflict task in healthy elderly individuals.
• To examine the impact of such practice on executive function, specifically working memory.
• To identify the neural substrates associated with practice-related improvements in attention control.

Main Methods:

• Healthy elderly participants engaged in a short-term Stroop task practice involving attention switching.
• Functional magnetic resonance imaging (fMRI) was used to measure brain activity during two working memory tasks: focus reading span test (F-RST) and non-focus reading span test (NF-RST).
• A control group that did not practice was included for comparison.

Main Results:

• Participants who practiced the conflict task showed significant increases in brain activation in the anterior cingulate cortex (ACC), left inferior parietal lobule (IPL), left dorsolateral prefrontal cortex (DLPFC), and precuneus during the NF-RST.
• The control group did not exhibit similar increases in activation in these regions.
• Performance on tasks requiring high attention control of working memory improved following practice.

Conclusions:

• Practice on conflict tasks in the elderly activates brain regions crucial for conflict perception, attention switching, and attention maintenance.
• These practice-induced neural changes lead to enhanced performance in working memory tasks demanding significant attention control.
• The findings suggest that targeted cognitive training can mitigate age-related declines in executive function.