Feedback-related negativity observed in rodent anterior cingulate cortex.

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Animal Models

Background:

• The feedback-related negativity (FRN) is an electrophysiological signal in humans linked to reward prediction errors.
• Source localization studies suggest the anterior cingulate cortex (ACC) generates the FRN, but the inverse problem limits certainty.
• A non-human primate FRN homologue exists, but a rodent equivalent remains unidentified.

Purpose of the Study:

• To investigate the existence of a rodent homologue of the FRN.
• To circumvent the limitations of source localization by directly recording neural activity.
• To explore neural correlates of decision-making and reward processing in rodents.

Main Methods:

• Recorded local field potentials (LFPs) directly from the ACC in 6 rodents.
• Utilized a task involving olfactory feedback predicting reward availability.
• Analyzed LFPs time-locked to feedback scent to identify FRN-like signals.

Main Results:

• Observed a significant FRN-like LFP deflection in the rodent ACC.
• LFPs predicting no-reward were more negative than those predicting reward.
• This neural signal preceded behavioral responses to feedback by approximately 130ms.

Conclusions:

• Provided the first evidence for a rodent homologue of the FRN.
• Demonstrated that the ACC is involved in processing reward prediction errors in rodents.
• This finding facilitates future research into the neural mechanisms of decision-making using rodent models.