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Title: The dynamics of contour integration: A simultaneous EEG-fMRI study
Authors: Mijovic, Bogdan ×
De Vos, Maarten
Vanderperren, Katrien
Machilsen, Bart
Sunaert, Stefan
Van Huffel, Sabine
Wagemans, Johan #
Issue Date: 2014
Publisher: Academic Press
Series Title: NeuroImage vol:88 pages:10-21
Abstract: To study the dynamics of contour integration in the human brain, we simultaneously acquired EEG and fMRI data while participants were engaged in a passive viewing task. The stimuli were Gabor arrays with some Gabor elements positioned on the contour of an embedded shape, in three conditions: with local and global structure (perfect contour alignment), with global structure only (orthogonal orientations interrupting the alignment), or without contour. By applying JointICA to the EEG and fMRI responses of the subjects, new insights could be obtained that cannot be derived from unimodal recordings. In particular, only in the global structure condition, an ERP peak around 300 ms was identified that involved a loop from LOC to the early visual areas. This component can be interpreted as being related to the verification of the consistency of the different local elements with the globally defined shape, which is necessary when perfect local-to-global alignment is absent. By modifying JointICA, a quantitative comparison of brain regions and the time-course of their interplay were obtained between different conditions. More generally, we provide additional support for the presence of feedback loops from higher areas to lower level sensory regions.
ISSN: 1053-8119
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory for Experimental Psychology
ESAT - STADIUS, Stadius Centre for Dynamical Systems, Signal Processing and Data Analytics
Translational MRI (+)
× corresponding author
# (joint) last author

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