PMID: 2096361Jan 1, 1990Paper

Coherence determines speed discrimination

Perception
L Welch, S F Bowne

Abstract

The visual system must determine which elements in a scene to regard as parts of a single object and which to regard as different objects. We can create stimuli that are ambiguous, ie consistent with more than one interpretation, and ask in what situations the stimulus elements are interpreted as part of a single object and when they are interpreted as multiple objects. The ambiguous stimuli in this study were moving plaid patterns--the sum of two drifting gratings with different orientations. Observers may see a rigid coherent plaid object moving in one direction, or may see two gratings moving in different directions sliding over one another. When the gratings have similar contrasts they appear to cohere and only the plaid speed is perceptually available; when the gratings have different contrasts they appear to slide and only the speeds of the gratings are perceived. Coherence thus determines what speed information is passed to higher stages of motion processing. A two-stage model of plaid motion perception is presented which agrees with the model proposed by Adelson and Movshon and extends it, detailing the relationship between coherence and speed discrimination.

References

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Citations

Aug 1, 1992·Vision Research·L S Stone, P Thompson
Dec 1, 1994·Vision Research·D BurkeP Wenderoth
Feb 1, 1997·Vision Research·P Verghese, L S Stone
Nov 1, 1994·Visual Neuroscience·H R Wilson, J Kim
Dec 4, 2009·PloS One·Elliot Freeman, Preeti Verghese
Jul 19, 2005·Vision Research·Jeff D WurfelNorberto M Grzywacz
Sep 1, 1996·Vision Research·K N Gurney, M J Wright
Jun 1, 2005·Vision Research·Louise S Delicato, Andrew M Derrington
Oct 1, 1996·Vision Research·B R BeutterL S Stone
Jun 1, 2001·Perception·E Festa-Martino, L Welch
Dec 4, 2001·Nature Neuroscience·Alexander C Huk, David J Heeger
May 9, 1996·Nature·P Verghese, L S Stone

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