Linking the dynamics of cognitive control to individual differences in working memory capacity: Evidence from...

Area of Science:

• Cognitive Psychology
• Neuroscience

Background:

• Cognitive control involves processes like threshold adjustment and controlled selection.
• Individual differences in working memory capacity (WMC) may influence these cognitive control mechanisms.

Purpose of the Study:

• To investigate the relationship between working memory capacity and the functioning of cognitive control processes.
• To examine how WMC affects motor output inhibition and stimulus-response translation.

Main Methods:

• Utilized reach tracking and WMC tasks (updating counters, symmetry span).
• Administered a reach-tracking version of the Eriksen flanker task to 135 undergraduates.
• Analyzed response times (RT) and reach trajectories in relation to WMC scores.

Main Results:

• Higher WMC correlated with smaller congruency effects in RT, indicating a general link to cognitive control processes.
• Higher WMC was associated with more direct reach movements on incongruent trials, suggesting a specific link to controlled selection.
• Findings support a relationship between WMC and both threshold adjustment and controlled selection processes.

Conclusions:

• Working memory capacity plays a significant role in modulating cognitive control.
• The findings contribute to understanding the unity and diversity of executive functions.
• Discusses the implications for the role of dopamine in cognitive control.