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. Author manuscript; available in PMC: 2011 May 4.
Published in final edited form as: J Vis. 2009 Jan 22;9(1):28.1–28.6. doi: 10.1167/9.1.28

Figure 1.

Figure 1

Two-stroke apparent motion sequence. Two pattern frames (Frame 1, Frame 2) are presented repeatedly; an inter-stimulus interval (ISI) intervenes at one of the two frame transitions. The Frame 1–Frame 2 transition in this example should generate a rightward motion signal in the visual system (arrows). The Frame 2–Frame 1 transition would normally generate a leftward motion signal, but it is argued that the effect of the ISI is to reverse this signal, so the sequence appears uni-directionally rightward. Note that experimental stimuli were gratings containing both light and dark bars, rather than the light bars illustrated.