Brain stimulation improves cognitive control by modulating medial-frontal activity and preSMA-vmPFC functional...

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Brain Stimulation

Background:

• Brain stimulation techniques, like anodal transcranial direct current stimulation (atDCS), have shown potential in improving inhibitory control.
• The precise neural mechanisms driving these improvements in inhibitory control following brain stimulation are not fully understood.

Purpose of the Study:

• To investigate the neural mechanisms underlying the improvement of inhibitory control induced by atDCS over the pre-supplementary motor area (preSMA).
• To examine the relationship between brain activity, functional connectivity, and behavioral performance during inhibitory control tasks after preSMA stimulation.

Main Methods:

• Coupling anodal transcranial direct current stimulation (atDCS) with functional MRI (fMRI) in human participants.
• Measuring brain activity (BOLD response) and functional connectivity between brain regions during a task requiring inhibitory control.
• Assessing behavioral improvements in stopping speed and efficiency.

Main Results:

• atDCS over the preSMA significantly improved stopping speed.
• This behavioral improvement was associated with increased Blood-Oxygen-Level-Dependent (BOLD) responses in the preSMA and ventromedial prefrontal cortex (vmPFC).
• Increased BOLD signal in the vmPFC correlated positively with enhanced stopping efficiency, and functional connectivity between the preSMA and vmPFC increased during successful inhibitory control.

Conclusions:

• PreSMA brain stimulation rapidly enhances inhibitory control by modulating activity within medial-frontal brain networks.
• The findings highlight the crucial role of preSMA-vmPFC functional connectivity in mediating the effects of brain stimulation on inhibitory control.
• This research provides insights into the neural underpinnings of cognitive enhancement through non-invasive brain stimulation.