Distinct behavioural and network correlates of two interneuron types in prefrontal cortex

Area of Science:

• Neuroscience
• Cell Biology
• Computational Neuroscience

Background:

• Prefrontal cortex neurons show diverse behavioral roles, potentially due to cell-type differences.
• Understanding neuron types is key to linking network function with behavior.

Purpose of the Study:

• To investigate the distinct roles of parvalbumin (PV) and somatostatin (SOM) interneurons in the anterior cingulate cortex during a reward foraging task.
• To determine how these specific neuron types contribute to decision-making processes in foraging behavior.

Main Methods:

• Electrophysiological recordings from genetically identified PV and SOM neurons in mice performing a reward foraging task.
• Analysis of neuronal activity in relation to specific behavioral events like reward approach and leaving.
• Characterization of the inhibitory effects of PV and SOM neurons on principal cells.

Main Results:

• PV and a subtype of SOM neurons exhibited distinct, dissociated roles in behavior and inhibition.
• SOM neurons selectively responded during reward approach, while PV neurons responded upon reward leaving and encoded preceding stay duration.
• PV neurons exerted fast, powerful inhibition, whereas SOM neurons had weaker, more variable inhibitory effects.

Conclusions:

• PV and SOM interneuron subtypes play functionally distinct roles in regulating information flow and decision-making during foraging.
• Cell-type diversity significantly contributes to the functional diversity observed in cortical circuits during behavior.
• These findings link specific interneuron classes to critical anterior cingulate cortex functions in foraging and decision-making.