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Fig. 1. Magnified view of dot pair at bottom right of Fig. 2. A pair of dots of different contrasts and polarities jump back and forth along orthogonal, crossing paths.

Fig. 2. Split dots stimulus. If stimulus geometry were the only factor, all dot pairs would appear to jump along parallel paths. In fact, however, VECTOR SUMMATION of their different contrasts makes dot pairs appear to follow different paths.

Fig. 3. Continuous version of the split dots stimulus. All dot pairs are black & white. On the light surround at left they appear to drift UP to the right, and on the dark surround at right they appear to drift DOWN to the right.

sanstis@ucsd.edu

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