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Anatomical characterization of the Frontal Voice Areas based on the individual sulcal anatomy

Melina Cordeau, Ihsane Bichoutar, David Meunier, Guillaume Auzias, Olivier Coulon, Isaure Michaud, Kep-Kee Loh, Pascal Belin

Date / Location: Monday, 11 July 2022 / S04-083
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In communication, two aspects are very important to maintain a conversation: voice production and voice perception. In voice perception, vocal stimuli carry a wealth of information on the interlocutor: age, gender, identity, mood, etc. The existence of a specialized voice processing cortical network has been well established in humans using fMRI: in particular, the β€œTemporal Voice Areas” (TVAs, Belin et al., 2000; Pernet et al., 2015) are organized bilaterally in three clusters arranged along the anterior, middle and posterior parts of the superior temporal sulcus and gyrus (STS/STG). More recently, voice selective regions have also been found in the frontal lobe (Aglieri et al., 2018). A group analysis led to the characterization of three bilateral clusters in the frontal lobe: the anterior, middle and posterior "Frontal Voice Areas" (a, m and pFVAs). Here we perform an anatomo-functional characterization of the FVAs based on individual sulcal anatomy: voice-selective regions were identified as those showing a significantly greater activity for vocal versus non-vocal sounds. For each subject, functional peaks were identified in volume space, and then visualised on the cortical surface mesh, in order to characterize their individual anatomical locations, and to compare them across individuals. We found that FVAs at the individual level could be identified bilaterally in a large proportion of individuals, although with a variable number of peaks. Importantly, despite substantial variations in their cortical locations across participants, the closest sulci to the six FVAs remained largely consistent across individuals, revealing critical sulci-function links for FVAs localisations in the human brain.

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