Mechanisms of visual motion detection

Paul R. Schrater, David C. Knill, Eero P. Simoncelli

Research output: Contribution to journalArticlepeer-review

52 Scopus citations


Visual motion is processed by neurons in primary visual cortex that are sensitive to spatial orientation and speed. Many models of local velocity computation are based on a second stage that pools the outputs of first-stage neurons selective for different orientation, but the nature of this pooling remains controversial. In a human psychophysical detection experiment, we found near-perfect summation of image energy when it was distributed uniformly across all orientations, but poor summation when it was concentrated in specific orientation bands. The data are consistent with a model that integrates uniformly over all orientations, even when this strategy is sub-optimal.

Original languageEnglish (US)
Pages (from-to)64-68
Number of pages5
JournalNature neuroscience
Issue number1
StatePublished - Jan 2000

Bibliographical note

Funding Information:
P.S. was supported by an NIH training grant, D.C.K. was supported by a grant from the NIH and E.P.S. was supported by a Sloan Fellowship, an NSF CAREER grant and the Sloan Program in Theoretical Neurobiology at New York University.


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