Neural mechanisms of interference control in working memory capacity

Area of Science:

• Cognitive Neuroscience
• Neuroimaging

Background:

• Working memory relies on active maintenance and interference suppression.
• Prefrontal and parietal cortices are key for working memory capacity.
• Neural mechanisms of interference control in working memory are understudied.

Purpose of the Study:

• To examine neural activity during interference control in a working memory task.
• To differentiate neural correlates of interference control during encoding and recall phases.

Main Methods:

• 22 healthy participants underwent functional MRI (fMRI).
• A modified Reading Span task with varying interference demands was used.
• Neural activity was analyzed during encoding and recall.

Main Results:

• Widespread brain networks involved in interference control during encoding: prefrontal, parietal, occipital cortices, cingulate, and cerebellum.
• Parietal and occipital regions were associated with interference control during recall.
• Findings support the role of frontoparietal circuits in working memory capacity and interference regulation.

Conclusions:

• The study identified specific brain regions involved in managing interference during working memory.
• Results highlight the importance of frontoparietal networks, including the inferior frontal gyrus, cingulate, occipital cortex, and cerebellum, for cognitive control in working memory.