Abstract
Reciprocating horizontal motion of a pattern of vertical lines caused horizontal induced motion of a dot that underwent vertical reciprocating motion. The real vertical motion and the induced horizontal motion of the dot resulted in a circular or oval apparent path. Increasing the two motion speeds caused the horizontal component of this resultant path to become smaller, a change that indicated a diminished induced effect. This effect of high motion speed was not due to a blurring of the moving line pattern at high speeds, since strong objective blurring of the line pattern did not diminish the extent of the induced motion it caused. When the eyes pursued the line pattern, speed increases that changed the apparent path of the dot when the dot was tracked had only a small effect, which was shown to result from incomplete tracking. We concluded that, in that case, the dot’s apparent path was not due to induced motion, but rather to the retinal path of the dot’s image.
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References
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This work was supported by Grant 11089 from the National Institute of Mental Health to Swarthmore College, Hans Wallach, principal investigator.
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Wallach, H., Becklen, R. An effect of speed on induced motion. Perception & Psychophysics 34, 237–242 (1983). https://doi.org/10.3758/BF03202951
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DOI: https://doi.org/10.3758/BF03202951