Subthalamic nucleus involvement in executive functions with increased cognitive load: a subthalamic nucleus and...

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Computational Neuroscience

Background:

• The subthalamic nucleus (STN) and anterior cingulate cortex (ACC) are implicated in executive functions.
• Understanding their roles in cognitive processing requires investigating their neural oscillatory activity during tasks of varying complexity.

Purpose of the Study:

• To investigate the event-related de/synchronizations (ERD/S) in the STN and ACC during a cognitive task with two complexity levels.
• To explore the neural underpinnings of cognitive load and executive function in the STN and ACC.

Main Methods:

• Utilized a Flanker test (FT) with visual stimuli to assess cognitive task performance.
• Recorded broadband oscillatory changes (2-45 Hz) in epilepsy and Parkinson's disease patients with implanted electrodes in the ACC and STN, respectively.
• Compared neural activity between simple (congruent) and complex (incongruent) task conditions.

Main Results:

• Both congruent and incongruent conditions elicited oscillatory changes in the ACC and STN.
• Significantly higher activation was observed in both regions during the incongruent (complex) task condition.
• The STN showed significantly greater activation in both alpha and beta ERD frequencies during the incongruent condition compared to the ACC.

Conclusions:

• The STN exhibits increased activation with higher cognitive load, suggesting its involvement in executive functions.
• Task-specific activation patterns in the STN indicate a role in controlling behavior, including selection and inhibition processes.
• Findings support the STN's broader role in cognitive control and human behavior regulation.