Somato-motor inhibitory processing in humans: an event-related functional MRI study

Area of Science:

• Neuroscience
• Cognitive Neuroscience

Background:

• Inhibitory control is crucial for human behavior.
• The neural basis of inhibitory processing remains debated.
• Previous studies primarily used visual go/nogo tasks.

Purpose of the Study:

• To investigate the neural correlates of inhibitory control using somatosensory go/nogo tasks.
• To determine if inhibitory processing is modality-dependent.
• To compare findings with previous visual go/nogo task studies.

Main Methods:

• Event-related functional magnetic resonance imaging (fMRI) was employed.
• Fifteen subjects performed two somatosensory go/nogo tasks: Movement and Count.
• Stimuli were presented with equal probability for go and nogo trials.

Main Results:

• The response inhibition network includes the dorsolateral (DLPFC) and ventrolateral (VLPFC) prefrontal cortices, pre-supplementary motor area (pre-SMA), anterior cingulate cortex (ACC), inferior parietal lobule (IPL), insula, and temporoparietal junction (TPJ).
• These activations were consistent across both Movement and Count Nogo trials, suggesting modality independence.
• Differential activation intensities were observed in the prefrontal cortex, temporal lobe, and ACC between Movement and Count Nogo trials.

Conclusions:

• The neural network for inhibitory processing is largely independent of sensory modality.
• Common neural networks support inhibitory control across different tasks.
• Task-specific response modes may involve distinct neural sub-networks within the broader inhibitory control system.