Title: Continuous mapping of the cortical object vision pathway using traveling waves in object space
Authors: Goesaert, Elfi
Op de Beeck, Hans # ×
Issue Date: 2010
Publisher: Academic Press
Series Title: NeuroImage vol:49 issue:4 pages:3248-3256
Abstract: Research into the organization of high-level visual cortex has mainly used discrete object classes (e.g. faces and buildings). In contrast, the lower levels of the visual cortex have mainly been studied using phase-encoding techniques with gradually changing rotating wedges and expanding/contracting rings. The gradual stimulus changes cause traveling waves on the cortical surface and time delays of each cortical location is related to stimulus preference. We propose to extend this method to study higher-order properties of visual objects. We created gradual morphing sequences from a face into a building and vice versa. The activation in traditional face- and house-selective regions corresponding to fusiform face area (FFA) and parahippocampal place area (PPA) was time-locked to presentation of respectively face(-like) and building(-like) stimuli in the morphing sequences. We also included contracting/expanding rings containing images of parts of natural scenes. Confirming existing literature with discrete object classes, activity in FFA and PPA was time-locked to the presentation of foveal and eccentric rings, respectively. The results however contradict large-scale continuous maps across the ventral visual stream, as the cortical area between FFA and PPA was not modulated by the position in the morphing sequences, nor by the retinotopic position of the rings. We conclude that phase-encoding techniques can help in revealing the organization of high-level visual regions for complex object properties.
ISSN: 1053-8119
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory for Biological Psychology
Laboratory for Experimental Psychology
× corresponding author
# (joint) last author

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