Psychophysical evidence for a functional hierarchy of motion processing mechanisms

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
P J BexW Makous

Abstract

Current models of motion perception typically describe mechanisms that operate locally to extract direction and speed information. To deal with the movement of self or objects with respect to the environment, higher-level receptive fields are presumably assembled from the outputs of such local analyzers. We find that the apparent speed of gratings viewed through four spatial apertures depends on the interaction of motion directions among the apertures, even when the motion within each aperture is identical except for direction. Specifically, local motion consistent with a global pattern of radial motion appears 32% faster than that consistent with translational or rotational motion. The enhancement of speed is not reflected in detection thresholds and persists in spite of instructions to fixate a single local aperture and ignore the global configuration. We also find that a two-dimensional pattern of motion is necessary to elicit the effect and that motion contrast alone does not produce the enhancement. These results implicate at least two serial stages of motion-information processing: a mechanism to code the local direction and speed of motion, followed by a global mechanism that integrates such signals to represent meaningf...Continue Reading

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Citations

Jan 23, 2014·Attention, Perception & Psychophysics·Peter Jes KohlerPeter Ulric Tse
Apr 5, 2003·Journal of Cognitive Neuroscience·Armando BertoneJocelyn Faubert
May 12, 2009·Attention, Perception & Psychophysics·Peter J KohlerPeter Ulric Tse
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May 27, 1999·Vision Research·P J BexW Makous
Oct 14, 2003·Vision Research·Armando Bertone, Jocelyn Faubert
Feb 15, 2005·Vision Research·Stéphane J M RainvilleNicholas E Scott-Samuel
Mar 4, 2005·Vision Research·Peter J Bex, Steven C Dakin
Mar 30, 2010·Vision Research·Cristina de la Malla, Joan López-Moliner
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Jun 20, 2006·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Peter J Bex, Helle K Falkenberg
Apr 6, 2002·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Peter J Bex, Steven C Dakin

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