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The role of early mechanisms in motion transparency and coherence A. J. NOEST1* and A. V. VAN DEN BERG2 1Department of Medical and Physiological Physics, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands 2Department of Physiology I, Erasmus University, Box 1738, 3000 DR Rotterdam, The Netherlands Received for publication 1 June 1992 Abstract-Perceptual dissociation of moving plaid patterns into independently moving bar gratings occurs most readily when the grating signals are combined as if the bars were semi-transparent objects (Ramachandran, V. S. (1990) in: AI and the Eye. Wiley, Chichester, pp. 21-77. Stoner, G. R., Albright, T. D. and Ramachandran, V. S. (1990) Nature 344, 153-155). These and other examples of motion trans- parency are exploited to constrain the set of viable models for human motion processing. For example, one may exclude any fixed recombination of local motion signals into a plaid motion signal. Broad classes of linear and non-linear mechanisms for tracking blobs, comers, and other unambiguous plaid motion cues can also be ruled out because they fail to reproduce the experimental results even qualita- tively. The shifting balance between the 'coherent plaid' and 'sliding gratings' percepts are attributed to processing stages before any integration or
Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill
Published: Jan 1, 1993
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