Marmoset Anterior Cingulate Area 32 Neurons Exhibit Responses to Presented and Produced Calls during Naturalistic Vocal Communication

Vocal communication is a complex social behavior that entails the integration of auditory perception and vocal production. Both anatomical and functional evidence have implicated the anterior cingulate cortex (ACC), including area 32, in these processes, but the dynamics of neural responses in area 32 during naturalistic vocal interactions remain poorly understood. Here, we addressed this by recording the activity of single area 32 neurons using chronically implanted ultrahigh-density Neuropixels probes in freely moving male common marmosets ( Callithrix jacchus ) engaged in an antiphonal calling paradigm in which they exchanged long-distance “phee” calls with a virtual conspecific. We found that many neurons exhibited complex modulations in discharge rates in response to presented calls, prior to and following self-generated calls, and during the interval between presented and produced vocalizations. These findings are consistent with the conceptualization of area 32 as an audiovocal interface integrating auditory information, cognitive processes, and motor outputs in the service of vocal communication.