subject 160301110546 nii files. Part of a dataset from the
paper entitled : The large-scale organization of shape processing in the
ventral and dorsal pathways by Freud, Culham, Plaut and Behrmann. See -
https://doi.org/10.1184/R1/c.3889873.v1. For each participant 8 functional
runs and one anatomical run are included.
Although shape perception is considered a
function of the ventral visual pathway, evidence suggests that the dorsal
pathway also derives shape-based representations. In two psychophysics and
neuroimaging experiments, we characterized the response properties, topographical organization
and perceptual relevance of these representations. In both pathways, shape
sensitivity increased from early visual cortex to extrastriate cortex but then
decreased in anterior regions. Moreover, the lateral aspect of the ventral
pathway and posterior regions of the dorsal pathway were sensitive to the
availability of fundamental shape properties, even for unrecognizable images.
This apparent representational similarity between the posterior-dorsal and
lateral-ventral regions was corroborated by a multivariate analysis. Finally, as
with ventral pathway, the activation profile of posterior dorsal regions was
correlated with recognition performance, suggesting a possible contribution to
perception. These findings challenge a strict functional dichotomy between the
pathways and suggest a more distributed model of shape processing.
National Science Foundation (NSF) - BCS-1354350; Canadian Institute of Health Research MOP 130345; Pennsylvania Department of Health's Commonwealth Universal Research Enhancement Program; Israel Science Foundation (ISF) grant No. 65/15