Characterizing switching and congruency effects in the Implicit Association Test as reactive and proactive cognitive...

Area of Science:

• Cognitive Neuroscience
• Psychology

Background:

• Task switching, a key executive function, influences performance on the Implicit Association Test (IAT).
• Existing d-score metrics for the IAT suggest task switching alone does not fully explain observed effects.
• Understanding the neural underpinnings of cognitive control in the IAT is crucial.

Purpose of the Study:

• To investigate multiple cognitive control processes contributing to IAT performance.
• To differentiate the neural correlates of task switching and incongruency using event-related brain potentials (ERPs).
• To examine the relationship between behavioral IAT bias and neural activity.

Main Methods:

• Participants completed a race-evaluative Implicit Association Test (IAT) while electroencephalography (EEG) was recorded.
• Event-related brain potentials (ERPs) were analyzed to identify neural markers of cognitive control.
• Behavioral data, including reaction times and IAT bias, were collected and correlated with ERP findings.

Main Results:

• Behaviorally, participants exhibited superadditive reaction time costs for both incongruency and task switching.
• ERPs showed a medial frontal negativity (MFN) that differed between incongruent and congruent trials, and between switch and no-switch trials.
• This MFN pattern suggests distinct neural processes are engaged by incongruency and task switching.

Conclusions:

• The findings support the engagement of separable cognitive control processes during IAT performance.
• Neural activity related to both incongruency and task switching predicts behavioral IAT bias.
• Results are interpreted within the Dual Mechanisms of Control (DMC) framework, highlighting reactive and proactive control.