The response of the VS to abrupt changes in luminance ("edges" or "con-
tours") displays "overshoots" known as Mach bands (Fig. 5), which have the
effect of enhancing or deblurring the edges. Such overshoot responses are, in
fact, predicted if one multiplies the spatial frequency spectrum of a steplike
function by the modulation transfer function of the VS (Fig. 6). The VS also
seems to "fill in" the apparent brightness in the interior of a region based
on that at the region's edges (perhaps at the frequency for which the response
is strongest). This is demonstrated in Fig. 7, where the two regions have the
same luminanc ...
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