Spatial attention is attracted in a sustained fashion toward singular points in the optic flow.

Separately for expanding and contracting motion, we compared the attentional effects between motion on and off, collapsing TSG and SSG, and found a highly significant difference for the expanding (paired t-test; p<0.0005) but not for the contracting conditions (p = 0.78).

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The results were similar to those collapsing over all conditions: a marginally significant main effect of motion direction (p = 0.061) but not eccentricity (p = 0.11).

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