Sensitivity to and Control of Distraction: Distractor-Entrained Oscillation and Frontoparietal EEG Gamma...

Area of Science:

• Neuroscience
• Cognitive Psychology
• Electrophysiology

Background:

• Cognitive control mechanisms, particularly involving the prefrontal cortex (PFC), are crucial for goal-directed behavior and resisting distractions.
• Frontoparietal networks are implicated in maintaining cognitive control during distraction.
• Gamma-band power, linked to cholinergic activity, is investigated for its role in distraction resistance.

Purpose of the Study:

• To investigate the role of gamma-band power in distraction resistance and frontoparietal networks.
• To examine changes in gamma activity and their relationship to top-down modulation and bottom-up distractor processing.
• To explore the neural mechanisms underlying cognitive control during attentional challenges.

Main Methods:

• Healthy young adults participated in a modified distractor condition sustained attention task (dSAT) using electroencephalography (EEG).
• A modified distractor was employed to entrain oscillatory activities, with the strength of entrainment quantifying distraction.
• Gamma activity, top-down control, bottom-up distractor processing, and response time variability were analyzed.

Main Results:

• Increased top-down control during distraction challenges led to increased gamma power in left parietal regions, not right prefrontal regions as predicted from rodent studies.
• The magnitude of left parietal gamma power increase was negatively correlated with neural activity reflecting bottom-up distractor processing in visual areas.
• Variability in right prefrontal gamma power correlated with increased response time variability during distraction.

Conclusions:

• Left parietal gamma power plays a significant role in resisting distraction, potentially by modulating bottom-up distractor processing.
• The right prefrontal cortex may be involved in signaling for top-down control rather than its direct implementation during distraction.
• Findings contribute to understanding the neural basis of cognitive control and attention in humans.