Are spatial patterns in the lateral occipital complex position-invariant?
Williams, M.A. × Baker, C.I. Op de Beeck, Hans Dang, S. Triantafyllou, C. Kanwisher, N.G. #
Perception vol:36 issue:suppl pages:111-111
European Conference on Visual Perception edition:30 location:Arezzo, Italy date:August 2007
Classification analyses of fMRI data can reveal the information present in spatial patterns of response across the cortex. We recently demonstrated that activation patterns in the lateral occipital complex (LOC) not only contain information about object category, but are related to behavioral performance in shape discrimination tasks (Williams et al, in press Nature Neuroscience). The object perception system needs to be able to cope with objects presented in different locations, sizes, and orientations. Here we ask whether the spatial patterns in LOC associated with different object categories are position-invariant. Novel objects (three categories) were used to eliminate confounds associated with familiarity. Two exemplars of a category were presented simultaneously within diagonally opposite visual quadrants. Participants responded whether the two objects were the same or different. Analysis of the activation patterns in the LOC revealed consistent spatial profiles within each of the three categories across the two diagonal location pairs. This result suggests that the activation pattern in LOC is position-invariant.