Tracing conflict-induced cognitive-control adjustments over time using aperiodic EEG activity.

Area of Science:

• Cognitive Neuroscience
• Computational Neuroscience

Background:

• Cognitive-control theories posit that response conflict prompts control adjustments.
• Existing research differentiates between adjustments affecting the current trial (N) versus the subsequent trial (N+1).

Purpose of the Study:

• To investigate the temporal dynamics of cognitive control adjustments.
• To quantify cortical noise as an indicator of control adjustments using aperiodic activity measures.

Main Methods:

• Employed the fitting oscillations and one over f algorithm to quantify cortical noise (aperiodic activity).
• Analyzed data from a large sample of 171 healthy adults.

Main Results:

• Response conflict trials significantly increased the aperiodic exponent, indicating reduced cortical noise.
• This noise reduction was evident in trial N but did not impact response selection until trial N+1.

Conclusions:

• Cognitive control adjustments do not interfere with ongoing response selection but rather prepare for enhanced control in subsequent trials.
• Findings suggest a conflict-induced shift from metacontrol flexibility to metacontrol persistence, potentially mediated by cortical noise reduction.