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Rapid Invariant Encoding Of Scene Layout In Human Opa, Linda Henriksson, Marieke Mur, Nikolaus Kriegeskorte
Rapid Invariant Encoding Of Scene Layout In Human Opa, Linda Henriksson, Marieke Mur, Nikolaus Kriegeskorte
Brain and Mind Institute Researchers' Publications
Successful visual navigation requires a sense of the geometry of the local environment. How do our brains extract this information from retinal images? Here we visually presented scenes with all possible combinations of five scene-bounding elements (left, right, and back walls; ceiling; floor) to human subjects during functional magnetic resonance imaging (fMRI) and magnetoencephalography (MEG). The fMRI response patterns in the scene-responsive occipital place area (OPA) reflected scene layout with invariance to changes in surface texture. This result contrasted sharply with the primary visual cortex (V1), which reflected low-level image features of the stimuli, and the parahippocampal place area (PPA), …
The Large-Scale Organization Of Shape Processing In The Ventral And Dorsal Pathways, Erez Freud, Jody C. Culham, David C. Plaut, Marlene Behrmann
The Large-Scale Organization Of Shape Processing In The Ventral And Dorsal Pathways, Erez Freud, Jody C. Culham, David C. Plaut, Marlene Behrmann
Brain and Mind Institute Researchers' Publications
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 …