Title: The use of phase-encoding techniques in object space: Investigating the organization of the cortical object vision pathway
Authors: Goesaert, Elfi
Op de Beeck, Hans #
Issue Date: 2009
Publisher: Pion Ltd.
Host Document: Perception vol:39 issue:Suppl. pages:119-119
Conference: European Conference on Visual Perception edition:32 location:Regensburg, Germany date:24-29 August 2009
Abstract: Research into the organization of high-level visual cortex has mainly used discrete object classes (eg faces and buildings). In contrast, the lower levels of the visual cortex have also 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 are related to stimulus preference. We propose to extend this method to study higher-order properties of visual objects. We validated this method with a face/house morphing continuum. We also included contracting/expanding rings cut out from natural scenes. Face- and house-selective regions (fusiform face area or FFA; parahippocampal place area or PPA) were defined with traditional block-design localizers. The method worked as intended: activity in FFA corresponded to presentation of face(-like) stimuli, and activity in PPA corresponded to the presentation of building(-like) stimuli. Additionally, 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. Nevertheless, the results show that phase-encoding techniques can be applied to stimuli with feature variations more suited to investigate high-level visual regions
Publication status: published
KU Leuven publication type: IMa
Appears in Collections:Laboratory for Biological Psychology
Laboratory for Experimental Psychology
# (joint) last author

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