Evidence for a feature tracking explanation of why type II plaids move in the vector sum direction at short durations

Vision Research
Linda Bowns

Abstract

When two moving sinusoidal gratings, with similar spatial frequency, contrast, phase, but different orientation are combined to form a plaid, their perceived direction of motion has been predicted by the intersection of constraints rule (IOC) (Adelson & Movshon, Nature, 300, 523-525, 1982). However, at short durations (60 msec) the direction of perceived motion has been predicted by the vector sum direction for "Type II" plaids (Yo & Wilson, Vision Research, 32, 1, 1992). Type II plaids are the set of plaids where the components are both located on one side of the resultant computed using the IOC rule. Yo and Wilson suggest that the vector sum direction is observed for Type II plaids at short durations because non-Fourier information is not available and direction is computed from Fourier information only. The first experiment in this study replicates the original Yo and Wilson result using similar stimuli but a simpler task; perceived direction was measured using a direction discrimination task instead of the method of adjustment used by Yo and Wilson. The second experiment provides evidence against generalizing the result to all Type II plaids. A systematic set of type II plaids that varied only in terms of the orientation of...Continue Reading

References

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Citations

Jul 19, 2005·Annual Review of Neuroscience·Richard T Born, David C Bradley
May 12, 2010·Journal of Neurophysiology·James M G TsuiChristopher C Pack
Apr 1, 2011·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Ben S WebbFrancesca Rocchi
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Nov 22, 2005·Vision Research·Craig Aaen-Stockdale, Linda Bowns
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Nov 18, 2005·Vision Research·Linda Bowns, David Alais
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Feb 28, 2019·Frontiers in Neuroscience·Anila GundavarapuKarthik Soman

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