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Motion capture anisotropy.

Studied whether a salient feature can capture and override a coherent motion signal and whether this capture occurs more readily along directions co-linear with the motion of the salient feature or orthogonal to it. Spatial frequency (SF) content was also examined. Ss could not discriminate incoherently moving spots captured by a moving grating from dots moving coherently along with the grating. The same 2 patterns were discriminated instantly if the grating motion suddenly stopped, suggesting that when grating displacement (GD) becomes large enough, the motion signal derived from it inhibits the motion signal arising from individual dots, and the visual system simply attributes the grating motion to the dots. Horizontal gratings captured coherent apparent motion of correlated dots moving horizontally or vertically, but a much larger horizontal GD was needed to override vertical dot motion. Low SFs were more able to capture high ones than vice versa. (PsycINFO Database Record (c) 2007 APA, all rights reserved)



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