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. Author manuscript; available in PMC: 2009 Feb 6.
Published in final edited form as: J Vis. 2006 Dec 12;6(12):1396–1405. doi: 10.1167/6.12.5

Figure 1.

Figure 1

(a) The FI. A yellow bar and a blue bar move over a striped background. (b) The two bars appear to repeatedly accelerate and decelerate in antiphase, although they, in fact, move at the same constant rate.