Spatio-temporal dynamics of face perception

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http://hdl.handle.net/10138/313631

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Muukkonen , I , Ölander , K , Numminen , J K & Salmela , V 2020 , ' Spatio-temporal dynamics of face perception ' , NeuroImage , vol. 209 , 116531 . https://doi.org/10.1016/j.neuroimage.2020.116531

Title: Spatio-temporal dynamics of face perception
Author: Muukkonen, Ilkka; Ölander, Kaisu; Numminen, Jussi Kustaa; Salmela, Viljami
Contributor: University of Helsinki, Department of Psychology and Logopedics
University of Helsinki, Department of Psychology and Logopedics
University of Helsinki, HUS Medical Imaging Center
University of Helsinki, Department of Psychology and Logopedics
Date: 2020-04-01
Number of pages: 12
Belongs to series: NeuroImage
ISSN: 1053-8119
URI: http://hdl.handle.net/10138/313631
Abstract: The temporal and spatial neural processing of faces has been investigated rigorously, but few studies have unified these dimensions to reveal the spatio-temporal dynamics postulated by the models of face processing. We used support vector machine decoding and representational similarity analysis to combine information from different locations (fMRI), time windows (EEG), and theoretical models. By correlating representational dissimilarity matrices (RDMs) derived from multiple pairwise classifications of neural responses to different facial expressions (neutral, happy, fearful, angry), we found early EEG time windows (starting around 130 ​ms) to match fMRI data from primary visual cortex (V1), and later time windows (starting around 190 ​ms) to match data from lateral occipital, fusiform face complex, and temporal-parietal-occipital junction (TPOJ). According to model comparisons, the EEG classification results were based more on low-level visual features than expression intensities or categories. In fMRI, the model comparisons revealed change along the processing hierarchy, from low-level visual feature coding in V1 to coding of intensity of expressions in the right TPOJ. The results highlight the importance of a multimodal approach for understanding the functional roles of different brain regions in face processing.
Subject: 515 Psychology
3112 Neurosciences
EEG
fMRI
RSA
Face expression
Decoding
Face perception
MULTIVARIATE PATTERN-ANALYSIS
OBJECT RECOGNITION
FACIAL EXPRESSIONS
REPRESENTATIONS
RESPONSES
IDENTITY
MEG
INVERSION
INFANTS
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