View-invariant representation of hand postures in the human lateral occipitotemporal cortex

NeuroImage
Stefania BracciMarius V Peelen

Abstract

Understanding other people's actions and mental states includes the interpretation of body postures and movements. In particular, hand postures are an important channel to signal both action and communicative intentions. Recognizing hand postures is computationally challenging because hand postures often differ only in the subtle configuration of relative finger positions and because visual characteristics of hand postures change across viewpoints. To allow for accurate interpretation, the brain needs to represent hand postures in a view-invariant but posture-specific manner. Here we test for such representations in hand-, body-, and object-selective regions of the lateral occipitotemporal cortex (LOTC). We used multivariate pattern analysis of fMRI data to test for view-specific and view-invariant representations of individual hand postures, separately for two domains: action-related postures (e.g., a precision grasp) and communicative postures (e.g., thumbs up). Results showed that hand-selective LOTC, but not nearby body- and object-selective LOTC, represented hand postures in a view-invariant manner, with relatively similar activity patterns to the same hand posture seen from different viewpoints. View invariance was equall...Continue Reading

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Citations

Sep 15, 2020·Frontiers in Human Neuroscience·Johannes BrandLars Michels
Nov 14, 2020·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Karla MatićStefania Bracci
Apr 20, 2021·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Fredrik BergströmJorge Almeida
Jul 17, 2021·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Elisabeth RounisMatthew A Lambon Ralph

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