How does the human visual system compare the speeds of spatially separated objects?

In the case of vertical motion, there is again a highly significant effect of Speed ( F (1.373) = 25.369 p = 0.002) and there is also a marginally significant effect of Separation, ( F (1.174) = 9.369, p = 0.029)–although it is the smallest separation that yields the highest thresholds.

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For the horizontal condition, a repeated-measures ANOVA, with factors Speed and Spatial Separation, shows a highly significant effect of speed but no effect of spatial separation and no significant interaction (After Greenhouse-Geisser correction, Speed, F (1.191) = 29.341, p = 0.003, Separation, F (1.41) = 2.683, p = 0.155, Interaction ( F (2.112) = 1.034, p = 0.401).

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The effect is particularly clear for motion on the vertical axis and is likely to explain the marginal significance of spatial separation in the ANOVA for this axis ( Table 1 ).

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