Combined Social and Spatial Coding in a Descending Projection from the Prefrontal Cortex

Area of Science:

• Neuroscience
• Behavioral Neuroscience
• Systems Neuroscience

Background:

• Social behaviors are fundamental for mammalian survival and reproduction.
• The prelimbic cortex (PL), a region of the medial prefrontal cortex, is known to play a role in social behavior, but the specific neuronal populations involved remain unclear.

Purpose of the Study:

• To identify distinct neuronal subpopulations within the PL and their downstream targets.
• To investigate the role of specific PL neuronal subpopulations in modulating social behavior and social-spatial learning.

Main Methods:

• Anatomical and molecular characterization of PL neuronal subpopulations.
• Targeting of downstream regions: nucleus accumbens (NAc), amygdala, and ventral tegmental area.
• Selective activation and recording of PL-NAc neurons.
• Spatially specific manipulation of neuronal activity.

Main Results:

• PL contains anatomically and molecularly distinct subpopulations projecting to the NAc, amygdala, and ventral tegmental area.
• Activation of PL-NAc neurons, but not other subpopulations, reduced preference for a social target.
• PL-NAc neurons exhibit spatially specific activity during social investigation.
• Bidirectional regulation of social-spatial association formation through spatially specific manipulation of PL-NAc neurons.

Conclusions:

• PL-NAc neurons convey both social and spatial information.
• This integration of social and spatial information within PL-NAc neurons is critical for social-spatial learning.
• These findings elucidate a novel mechanism by which the brain supports complex social behaviors.