Theta oscillations in anterior cingulate cortex and orbitofrontal cortex differentially modulate accuracy and speed...

Area of Science:

• Neuroscience
• Cognitive Science

Background:

• Flexible reward learning is crucial for adapting behavior.
• The anterior cingulate cortex (ACC) and orbitofrontal cortex (OFC) are key frontal regions involved.
• Theta oscillations (5-10 Hz) are implicated in coordinating learning, but ACC-OFC network interactions remain unclear.

Purpose of the Study:

• To investigate network-level interactions between ACC and OFC during flexible learning.
• To determine the role of ACC theta oscillations in stimulus-reward association learning and reversal.

Main Methods:

• Simultaneous in vivo electrophysiology in rat dorsal ACC and ventral OFC.
• Bilateral inhibitory DREADDs to inhibit ACC function.
• Within-subject design assessing accuracy and response speed during visual discrimination and reversal learning.

Main Results:

• ACC inhibition led to random responding during early reversal learning.
• Theta power differences between correct and incorrect trials were only significant in the OFC, not ACC, post-inhibition.
• ACC inhibition accelerated incorrect choices during reversal learning, unlike in control animals.

Conclusions:

• Impaired reversal learning after ACC inhibition is characterized by poor deliberation and weak theta signaling.
• OFC theta oscillations are a prominent feature of reversal learning, independent of ACC activity.