TY - JOUR
T1 - Spatiotemporal Dynamics Underlying Object Completion in Human Ventral Visual Cortex
AU - Tang, Hanlin
AU - Buia, Calin
AU - Madhavan, Radhika
AU - Crone, Nathan E.
AU - Madsen, Joseph R.
AU - Anderson, William S.
AU - Kreiman, Gabriel
N1 - Funding Information:
We thank all the patients for participating in this study; Laura Groomes for assistance with the electrode localization and psychophysics experiments; Sheryl Manganaro, Jack Connolly, Paul Dionne, and Karen Walters for technical assistance; and Ken Nakayama and Dean Wyatte for comments on the manuscript. This work was supported by NIH (DP2OD006461) and NSF (0954570 and CCF-1231216).
PY - 2014/8/6
Y1 - 2014/8/6
N2 - 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.
AB - 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.
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U2 - 10.1016/j.neuron.2014.06.017
DO - 10.1016/j.neuron.2014.06.017
M3 - Article
C2 - 25043420
AN - SCOPUS:84905576028
SN - 0896-6273
VL - 83
SP - 736
EP - 748
JO - Neuron
JF - Neuron
IS - 3
ER -