The Neural Correlates of Updating and Gating in Procedural Working Memory

Area of Science:

• Cognitive Neuroscience
• Neuroimaging

Background:

• Goal-directed behavior depends on working memory (WM) for maintaining and updating goals.
• While declarative WM processes are understood, neural substrates for procedural WM updating remain unclear.

Purpose of the Study:

• To investigate the neural mechanisms underlying the updating of procedural information in working memory.
• To identify brain regions associated with gate-opening, gate-closing, task switching, and cue conflict in procedural WM.

Main Methods:

• fMRI scans of 43 participants performing a procedural reference-back task.
• Decomposition of WM updating into gate-opening, gate-closing, task switching, and cue conflict components.
• Analysis of behavioral costs and neural correlates.

Main Results:

• Behavioral costs observed for all WM updating components, with interactions between gate-opening, task switching, and cue conflict.
• Procedural WM gate-opening associated with medial pFC, PPC, basal ganglia, thalamus, and midbrain activity when task sets updated.
• Gate-closing linked to frontoparietal and basal ganglia activity during conflict, task switching to medial pFC/ACC, PPC, and BG, and cue conflict to PPC and BG.

Conclusions:

• Neural substrates for procedural working memory updating have been identified.
• Findings contribute to understanding the neural basis of goal-directed behavior and inform gating models of WM.