Functional interactions between oculomotor regions during prosaccades and antisaccades

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Systems Neuroscience

Background:

• Human behavior involves balancing automatic and directed actions.
• The oculomotor network, including the presupplementary motor area (pre-SMA), frontal eye fields (FEF), and intraparietal sulcus (IPS), is crucial for behavioral control.
• Prosaccades and antisaccades engage distinct cognitive processes within this network.

Purpose of the Study:

• To investigate the functional interactions among key brain regions involved in oculomotor control.
• To explore how the pre-SMA functionally connects with the FEF and IPS during pro- and antisaccade tasks.
• To understand the neural mechanisms underlying the balance between automatic and directed actions.

Main Methods:

• Event-related functional magnetic resonance imaging (fMRI) was employed to capture brain activity.
• A multivariate technique, specifically coherence analysis of fMRI time series, was used to measure functional interactions.
• Participants performed an interleaved pro/antisaccade task to elicit differential brain responses.

Main Results:

• Functional connectivity, measured by coherence, was analyzed between the pre-SMA and the FEF and IPS.
• The FEF demonstrated significant differential coherence with the pre-SMA during pro- versus antisaccade trials.
• The IPS did not show significant differential coherence with the pre-SMA in the same task conditions.

Conclusions:

• The pre-SMA plays a coordinating role with the FEF in maintaining preparatory control for oculomotor execution.
• These findings suggest a specific functional interaction between the pre-SMA and FEF for controlled behavioral responses.
• The results contribute to understanding the neural basis of cognitive control in the human brain.