Motion illusions as optimal percepts
Published in:
Nature:Neuroscience
Vol 5, num 6, pp 598-604, June 2002.
© Macmillan Magazines Ltd.
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The pattern of local image velocities on the retina encodes important
environmental information. Although humans are generally able to
extract this information, they can easily be deceived into seeing
incorrect velocities. We show that these illusions arise naturally in
a system that attempts to estimate local image velocity. We formulated
a model of visual motion perception using standard estimation theory,
under the assumptions that (i) there is noise in the initial
measurements and (ii) slower motions are more likely to occur than
faster ones. We found that specific instantiation of such a velocity
estimator can account for a wide variety of psychophysical phenomena.
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