A Basal Forebrain-Cingulate Circuit in Macaques Decides It Is Time to Act.

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Decision Neuroscience

Background:

• The medial frontal cortex is implicated in voluntary action.
• The precise timing mechanisms for action decisions remain unclear.

Purpose of the Study:

• To investigate the neural basis for the timing of voluntary action decisions.
• To identify brain areas and contextual factors influencing action timing.

Main Methods:

• Studied macaques performing action-based tasks.
• Analyzed neural activity in the anterior cingulate cortex and basal forebrain.
• Used focused transcranial ultrasound to modulate activity in these deep brain regions.

Main Results:

• Action timing decisions were predicted by contextual factors like reward rate and prior actions.
• Anterior cingulate cortex and basal forebrain activity correlated with these contextual factors.
• Modulating activity in these areas altered action timing decisions.

Conclusions:

• Contextual factors significantly influence the timing of voluntary actions.
• The anterior cingulate cortex and basal forebrain differentially mediate the impact of context on action timing.
• Targeted neuromodulation can alter decision-making timing.