Segregating attention from response control when performing a motor inhibition task: Segregating attention from...

Area of Science:

• Cognitive Neuroscience
• Neuroimaging

Background:

• Inferior frontal gyrus (IFG), anterior insula cortex (AIC), and supplementary motor area (SMA) are implicated in inhibitory control.
• Disagreement exists regarding whether these regions are involved in response inhibition or attentional processing.

Purpose of the Study:

• Investigate the roles of IFG, AIC, and SMA in inhibitory control using a Go/No-go task.
• Differentiate between response inhibition and attentional processing functions.

Main Methods:

• Factorial Go/No-go task design.
• Functional magnetic resonance imaging (fMRI).
• Generalized psychophysiological interaction (gPPI) analyses.

Main Results:

• Left IFG and dorsal pre-SMA responded to no-go cues regardless of frequency, suggesting a role in motor response inhibition.
• gPPI indicated IFG interacts with basal ganglia and suppresses visual cue representations for no-go responses.
• AIC and ventral pre-SMA showed heightened responses to low-frequency stimuli, potentially for additional processing.
• gPPI revealed increased AIC connectivity with visual cortex for low-frequency cues.

Conclusions:

• Left IFG and dorsal pre-SMA are crucial for inhibiting motor responses.
• AIC and ventral pre-SMA may play a role in attentional processing, particularly for infrequent stimuli.
• Neural mechanisms involve IFG-basal ganglia interactions and visual suppression for inhibition, and AIC-visual cortex connectivity for attention.