Segregating Top-Down Selective Attention from Response Inhibition in a Spatial Cueing Go/NoGo Task: An ERP and Source...

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Psychology

Background:

• Response inhibition requires attentional detection of cancellation cues.
• While stimulus-driven processing is studied, top-down control's role in inhibition is less understood.

Purpose of the Study:

• To investigate the neural mechanisms of top-down attentional control in response inhibition.
• To differentiate electrophysiological correlates of attention from those of inhibition.

Main Methods:

• Scalp electroencephalography (EEG) was recorded from 32 participants during a modified Go/NoGo task.
• A spatial-cueing paradigm manipulated top-down selective attention.
• Source analysis was performed to localize neural activity.

Main Results:

• Event-related potentials (N2, P3) were observed during attended response inhibition.
• In the ignored condition, P3 was smaller and N2 was absent.
• P3 correlated with CNV, suggesting an inhibitory role.
• Source analysis localized P3 to the midcingulate cortex.
• Attended inhibition showed increased activation in frontal and insular regions.

Conclusions:

• Top-down selective attention modulates neural activity during response inhibition.
• Specific brain regions, including the inferior frontal gyrus, are involved in attentional control for inhibition.
• Findings distinguish neural correlates of attention from inhibition, advancing understanding of response control mechanisms.