Spatiotemporal Dynamics Underlying Object Completion in Human Ventral Visual Cortex

TitleSpatiotemporal Dynamics Underlying Object Completion in Human Ventral Visual Cortex
Publication TypeJournal Article
Year of Publication2014
AuthorsTang, H, Buia, C, Madhavan, R, Crone, NE, Madsen, J, Anderson, WS, Kreiman, G
Pagination736 - 748
Date Published08/06/2014
KeywordsCircuits for Intelligence, vision

Natural vision often involves recognizing objects from partial information. Recognition of objects from parts presents a significant challenge for theories of vision because it requires spatial integration and extrapolation from prior knowledge. Here we recorded intracranial field potentials of 113 visually selective electrodes from epilepsy patients in response to whole and partial objects. Responses along the ventral visual stream, particularly the Inferior Occipital and Fusiform Gyri, remained selective despite showing only 9-25% of the object areas. However, these visually selective signals emerged ~100 ms later for partial versus whole objects. These processing delays were particularly pronounced in higher visual areas within the ventral stream. This latency difference persisted when controlling for changes in contrast, signal amplitude, and the strength of selectivity. These results argue against a purely feed-forward explanation of recognition from partial information, and provide spatiotemporal constraints on theories of object recognition that involve recurrent processing.

Short TitleNeuron

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CBMM Relationship: 

  • CBMM Funded