‘Not only faces’: specialized visual representation of human hands revealed by adaptation

Author:

Conson Massimiliano1ORCID,Polito Francesco1,Di Rosa Alessandro1,Trojano Luigi1,Cordasco Gennaro1,Esposito Anna1,Turi Marco2

Affiliation:

1. Department of Psychology, University of Campania Luigi Vanvitelli, Caserta, Italy

2. Stella Maris Mediterraneo Foundation, Chiaromonte, Potenza, Italy

Abstract

Classical neurophysiological studies demonstrated that the monkey brain is equipped with neurons selectively representing the visual shape of the primate hand. Neuroimaging in humans provided data suggesting that a similar representation can be found in humans. Here, we investigated the selectivity of hand representation in humans by means of the visual adaptation technique. Results showed that participants' judgement of human-likeness of a visual probe representing a human hand was specifically reduced by a visual adaptation procedure when using a human hand adaptor but not when using an anthropoid robotic hand or a non-primate animal paw adaptor. Instead, human-likeness of the anthropoid robotic hand was affected by both human and robotic adaptors. No effect was found when using a non-primate animal paw as adaptor or probe. These results support the existence of specific neural mechanisms encoding human hand in the human's visual system.

Funder

Italian project SIROBOTICS

EU H2020

Università della Campania Luigi Vanvitelli “programma V:ALERE 2019”

Publisher

The Royal Society

Subject

Multidisciplinary

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