By David N. Lee, David S. Young (auth.), David J. Ingle, Marc Jeannerod, David N. Lee (eds.)
This quantity includes chapters derived from a N. A. T. O. complicated examine Institute held in June 1983. because the director of this A. S. I. it used to be my wish that a number of the e1ectrophysiologists may perhaps show the prospects in their paintings for perceptual conception, and that a few perceptionists may speculate at the underlying "units" of belief in a manner that may have interaction the mind's eye of physio logists. The reader must be the pass judgement on of no matter if this used to be completed, or no matter if this sort of psychophysiological inter1ingua continues to be overly idealistic. it's transparent that when the revolution prec~pitated by means of Hube1 and Weisel in knowing of visible cortical neurons we nonetheless have just a foggy notion of the behavioral output of any specific species of cortical detector. It was once for that reason relatively unlucky that individuals who've made nice strides in correlating fascinating points of cat cortical physio logy with human psychophysics (Max Cynader and Martin Regan of Dalhousie college) have been not able to wait this assembly. by no means theless, a few new and not easy principles relating to either spatial notion and cortical mechanisms are represented during this quantity, and it truly is was hoping that the reader will consider not just the person demonstrations however the severe questions posed by means of the apposition of the 2 assorted collections of experimental evidence. David Ingle April 1984 VII desk OF CONTENTS PREFACE V D. N. Lee and D. S. younger visible Timing of Interceptive motion 1 J. J.
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Additional info for Brain Mechanisms and Spatial Vision
The expansion con~ains two extrema: one is at the point where the bisectrix of V and the normal of the plane meets the plane, the other lies in a perp~n dicular direction (Figure 16). This yields the direction of V/h (h the height above the plane), the expansion at the extrema yields also the magnitude. This is obvio~sly all you can hope to extract: there is no way to get at h and V separately because you measure only angular relationships! Instead of from the expansion, you could as well have obtained these results from the shear.
London: Hutchinson, A McGraw-Hill Co- Publication 1980) 37 An example is given in Figure 6. I first put a rectangular coordinate grid over the optic array. ) The grid serves as a label on visual directions. Then I let the grid be carried along with the optical flow for a small time: the result is shown in Figure 6. Figure 5 The stereographic pro j ec tion. (D. Hilbert, S. Cohn-Vossen: Springer 1932) • ... -... -. Anschauliche Geometrie. _.... . Figure 6 The optical flow induced by a "free fall" (perpendicularly plane surface).
The latter is what you get with an eye-movement: the optic array turns as a whole. Such isometries carry no information about the spatial lay-out of the ambient space at all. (a8r1 + (38r2 ) =aVu. 811 + (3 quo 8r; ). Now any linear operator can be written as a superposition of a few basic "differential invariants", which contain the features of the motion parallax that are singled out through certain symmetry properties. I write: ............. ~ 1 • -+ -+ 1 ~. ,. vU 8r+ -curlu1l8r+-defuP8r. 2 2 2 The terms are called the "divergence", the "vorticity" and the "deformation" or "shear" (The operator II is defined below).
Brain Mechanisms and Spatial Vision by David N. Lee, David S. Young (auth.), David J. Ingle, Marc Jeannerod, David N. Lee (eds.)