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Online Transcranial Magnetic Stimulation Protocol for Measuring Cortical Physiology Associated with Response Inhibition
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Optogenetic Inhibition of the Orbitofrontal Cortex Disrupts Inhibitory Control during Stop-Change Performance in Male

Adam T Brockett1,2,3, Neeraj Kumar4, Paul Sharalla4

  • 1Department of Psychology, University of Maryland, College Park, Maryland 20742 adam.brockett@unh.edu.

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Summary
This summary is machine-generated.

The orbitofrontal cortex (OFC) is crucial for inhibitory control, particularly in stop-change tasks. Inhibiting OFC neurons impaired performance on specific stop trials, highlighting its role in suppressing unwanted responses.

Keywords:
OFCinhibitory controloptogeneticsresponse inhibitionstop-signal

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Behavioral Neuroscience

Background:

  • The orbitofrontal cortex (OFC) is historically linked to diverse behaviors, including reversal learning and reward value representation.
  • Modern OFC research emphasizes its role in outcome evaluation, often involving response inhibition.
  • The OFC's involvement in inhibitory control requires further elucidation, especially in complex tasks.

Purpose of the Study:

  • To investigate the specific role of the orbitofrontal cortex (OFC) in inhibitory control during a stop-change task.
  • To determine if OFC function differs based on the preceding trial type (GO vs. STOP).

Main Methods:

  • Utilized optogenetic techniques, expressing halorhodopsin (eNpHR3.0) in excitatory OFC neurons in rats.
  • Assessed rat performance on a stop-change task under conditions of OFC inhibition.
  • Analyzed behavioral data, focusing on accuracy and reaction times during different trial types (gS and sS trials).

Main Results:

  • Optogenetic inhibition of OFC neurons significantly reduced accuracy specifically on stop-change trials that followed a GO trial (gS trials).
  • Inhibition of the OFC led to faster reaction times on error trials, suggesting an impact on response inhibition.
  • The OFC's activity is sensitive to the preceding trial context, differentiating between gS and sS trials.

Conclusions:

  • The orbitofrontal cortex plays a significant role in inhibitory control processes within the stop-change task.
  • These findings underscore the importance of considering the OFC's function in response inhibition for contemporary models of its cognitive role.
  • The OFC's contribution to inhibiting maladaptive responses is critical for successful task performance.