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. Author manuscript; available in PMC: 2009 Jun 28.
Published in final edited form as: J Vis. 2008 Jul 31;8(7):20.1–2013. doi: 10.1167/8.7.20

Figure 4.

Figure 4

The grating with the higher speed appears behind the other grating more often. (A) The fraction of time f that grating 1 was perceived to be moving behind grating 2 increases as a function of its speed (the speed of grating 2 was fixed at 5.4°/s, as indicated by the black arrow). (B) A schematic diagram to explain the systematic relation caused by ego motion between the retinal speed of objects and their distances from the observer (see text). (C) The fraction of time f that the faster grating 1 was perceived to be moving behind the slower grating 2 as a function of the luminance of the grating 1. The luminance of grating 2 was fixed at 30 cd/m2; the speeds of the gratings were fixed at 5.4°/s and 0.18°/s.