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. Author manuscript; available in PMC: 2012 Mar 1.
Published in final edited form as: J Soc Inf Disp. 2011 Mar 1;19(3):271–297. doi: 10.1889/JSID19.3.271

FIGURE 17.

FIGURE 17

Stimulus for Experiment 4. (a) White circles moved at constant speed on a circular path on a dark background. The diameter of the white circles was 1°, and the diameter of the circular path was 4.9°. (b) Changes in apparent slant. The plane of white circles is represented by the dark square and the fronto-parallel plane by the gray square. The static vertical line was in the fronto-parallel plane. The rest of that plane was of course not visible. Observers indicated whether the plane of circles appeared to be pitched top forward or top back relative to the fronto-parallel plane.