Article (Scientific journals)
Uncovering the neural magnitude and spatio-temporal dynamics of natural image categorization in a fast visual stream.
RETTER, Talia; Rossion, Bruno
2016In Neuropsychologia, 91, p. 9 - 28
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Abstract :
[en] Perceptual categorization occurs rapidly under natural viewing conditions. Yet, the neural spatio-temporal dynamics of category-selective processes to single-glanced, natural (i.e., unsegmented) images in a rapidly changing presentation stream remain unknown. We presented human observers with natural images of objects at a fast periodic rate of 12.5Hz, i.e., every 80ms. Images of faces were inserted every 3, 5, 7, 9, or 11 stimuli, defining stimulus-onset-asynchronies (SOAs) between 240-880ms, i.e., presentation frequencies (Fs) between 4.17-1.14Hz. Robust face-selective responses were objectively identified and quantified at F and its harmonics (2F, 3F, etc.) for every condition in the electroencephalogram (EEG). The summed-harmonic face-selective response was significantly reduced by 25% at the lowest face SOA, i.e. 240ms between two faces, but remained stable from 400ms SOA onward. This high-level, right lateralized face-selective response emerged at about 100ms post-stimulus onset and progressed spatially throughout four successive time-windows (i.e., P1-face, N1-face, P2-face, P3-face) from posterior to anterior occipito-temporal electrode sites. The total duration of a category-selective response to a briefly presented face stimulus in a rapid sequence of objects was estimated to be 420ms. Uncovering the neural spatio-temporal dynamics of category-selectivity in a rapid stream of natural images goes well beyond previous evidence obtained from spatially and temporally isolated stimuli, opening an avenue for understanding human vision and its relationship to categorization behavior.
Disciplines :
Neurosciences & behavior
Author, co-author :
RETTER, Talia  ;  Psychological Sciences Research Institute, Institute of Neuroscience, University of Louvain, Belgium, Department of Psychology, Center for Integrative Neuroscience, University of Nevada, Reno, USA. Electronic address: tlretter@nevada.unr.edu
Rossion, Bruno;  Psychological Sciences Research Institute, Institute of Neuroscience, University of Louvain, Belgium, Neurology Unit, Centre Hospitalier Regional Universitaire (CHRU) de Nancy, F-54000 Nancy, France
External co-authors :
yes
Language :
English
Title :
Uncovering the neural magnitude and spatio-temporal dynamics of natural image categorization in a fast visual stream.
Publication date :
October 2016
Journal title :
Neuropsychologia
ISSN :
0028-3932
eISSN :
1873-3514
Publisher :
Elsevier Ltd, England
Volume :
91
Pages :
9 - 28
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
ARC
Belgian National Foundation for Scientific Research
Funding text :
This work was supported by the European Research Council (ERC; grant number facessvep 284025 to BR) an “Action de Recherche Concertee” grant ( ARC ; 13/18-053 ) and the Belgian National Foundation for Scientific Research (FNRS; grant number FC7159 to TR). The authors have no conflict of interests to report.
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