# Contact Information

 Laurent Perrinet - Team InViBe Institut de Neurosciences de la Timone UMR 7289 Aix Marseille Université, CNRS, 13385 cedex 5, Marseille, France Researcher http://invibe.net/LaurentPerrinet
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 Email Address Institut de Neurosciences de la Timone (UMR 7289) Aix Marseille Université, CNRS Faculté de Médecine - Bâtiment Neurosciences 27, Bd Jean Moulin 13385 Marseille Cedex 05 France Phone +33.491 324 044
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 Figure 3: Equivalent MC representations of some classical stimuli. (A, top): a narrow-orientation-bandwidth Motion Cloud produced only with vertically oriented kernels and a horizontal mean motion to the right. (Bottom): The spectral envelopes concentrated on a pair of patches centered on a constant speed surface. Note that this speed plane" is thin (as seen by the projection onto the ($f_x$,$f_t$) face), yet it has a finite thickness, resulting in small, local, jittering motion components. (B) a Motion Cloud illustrating the aperture problem. (Top): The stimulus, having oblique preferred orientation ($\theta=\frac{\pi}{4}$ and narrow bandwidth $B_{\theta}=\pi/36$) is moving horizontally and rightwards. However, the perceived speed direction in such a case is biased towards the oblique downwards, i.e., orthogonal to the orientation, consistently with the fact that the best speed plane is ambiguous to detect. (C): a low-coherence random-dot kinematogram-like Motion Cloud: its orientation and speed bandwidths, $B_{\theta}$ and $B_{V}$ respectively, are large, yielding a low-coherence stimulus in which no edges can be identified.

"All generalisations are dangerous, including this one." (Alexandre Dumas)

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