Voice identity invariance by anterior temporal lobe neurons
Margherita Giamundo, Régis Trapeau, Etienne Thoret, Luc Renaud, Thomas G. Brochier, Pascal Belin · bioRxiv (Cold Spring Harbor Laboratory) · 2024
Abstract The ability to recognize speakers by their voice despite acoustical variation plays a significant role in primate social interactions. While neurons in the macaque anterior temporal lobe (ATL) show invariance to face viewpoint, whether they also encode abstract representations of caller identity is not known. Here we show that neurons in the voice-selective ATL of two macaques show invariance to voice identity via dynamic representations that minimize within-caller neuronal distances while maintaining distinct neural trajectories for different individuals. A small proportion of highly identity-selective neurons plays a central role although less selective neurons are also informative. Our findings provide a neural basis for voice identity recognition in primates and highlight the ATL as a key hub for integrating perceptual voice features into higher-level identity representations.