Spatiotemporal Dynamics Underlying Object Completion in Human Ventral Visual Cortex

Hanlin Tang, Calin Buia, Radhika Madhavan, Nathan E. Crone, Joseph R. Madsen, William S. Anderson, Gabriel Kreiman

Research output: Contribution to journalArticlepeer-review

Abstract

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 feedforward explanation of recognition from partial information, and provide spatiotemporal constraints on theories of object recognition that involve recurrent processing.

Original languageEnglish (US)
Pages (from-to)736-748
Number of pages13
JournalNeuron
Volume83
Issue number3
DOIs
StatePublished - Aug 6 2014

ASJC Scopus subject areas

  • Neuroscience(all)

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