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The early visual encoding of a face (N170) is viewpoint-dependent: A parametric ERP-adaptation study

Abstract : Visual representations of faces are extracted shortly after 100 ms in the human brain, leading to an occipito-temporal cortex N170 event-related potential (ERP). To understand the nature of this early visual representation, a full-front adapting face preceded a different or identical target face identity. The target face varied parametrically in head orientation from the adapting face (0–90°, 15° steps). The N170 elicited by the target face increased progressively from 0° up to 30° head orientation, with no further increase until 90°. The N170 decreased for repeated face identities, this effect being stable between 0° and 30° changes of viewpoint, and no effect beyond that angle. These observations suggest that a face is encoded in a view-dependent manner, being matched to either a full-front or a profile face view. Yet, individual face representations activated as early as the peak of the N170 generalize partially across views.
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https://hal.univ-lorraine.fr/hal-01586709
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Submitted on : Wednesday, September 13, 2017 - 10:37:45 AM
Last modification on : Monday, November 9, 2020 - 4:30:03 PM

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Stéphanie Caharel, Kevin Collet, Bruno Rossion. The early visual encoding of a face (N170) is viewpoint-dependent: A parametric ERP-adaptation study. Biological Psychology, Elsevier, 2015, 106, pp.18 - 27. ⟨10.1016/j.biopsycho.2015.01.010⟩. ⟨hal-01586709⟩

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