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Intracranial markers of conscious face perception in humans

Lookup NU author(s): Dr Jochem van Kempen

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Abstract

© 2017 Elsevier Inc. Investigations of the neural basis of consciousness have greatly benefited from protocols that involve the presentation of stimuli at perceptual threshold, enabling the assessment of the patterns of brain activity that correlate with conscious perception, independently of any changes in sensory input. However, the comparison between perceived and unperceived trials would be expected to reveal not only the core neural substrate of a particular conscious perception, but also aspects of brain activity that facilitate, hinder or tend to follow conscious perception. We take a step towards the resolution of these confounds by combining an analysis of neural responses observed during the presentation of faces partially masked by Continuous Flash Suppression, and those responses observed during the unmasked presentation of faces and other images in the same subjects. We employed multidimensional classifiers to decode physical properties of stimuli or perceptual states from spectrotemporal representations of electrocorticographic signals (1071 channels in 5 subjects). Neural activity in certain face responsive areas located in both the fusiform gyrus and in the lateral-temporal/inferior-parietal cortex discriminated seen vs. unseen faces in the masked paradigm and upright faces vs. other categories in the unmasked paradigm. However, only the former discriminated upright vs. inverted faces in the unmasked paradigm. Our results suggest a prominent role for the fusiform gyrus in the configural perception of faces, and possibly other objects that are holistically processed. More generally, we advocate comparative analysis of neural recordings obtained during different, but related, experimental protocols as a promising direction towards elucidating the functional specificities of the patterns of neural activation that accompany our conscious experiences. Keywords: Consciousness, Visual awareness, Face perception, ECoG, Brain decoding, Visual masking


Publication metadata

Author(s): Baroni F, van Kempen J, Kawasaki H, Kovach CK, Oya H, Howard MA, Adolphs R, Tsuchiya N

Publication type: Article

Publication status: Published

Journal: NeuroImage

Year: 2017

Volume: 162

Pages: 322-343

Print publication date: 15/11/2017

Online publication date: 04/09/2017

Acceptance date: 24/08/2017

ISSN (print): 1053-8119

ISSN (electronic): 1095-9572

Publisher: Academic Press Inc.

URL: https://doi.org/10.1016/j.neuroimage.2017.08.074

DOI: 10.1016/j.neuroimage.2017.08.074


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