Abstract
Estimates of temporal proximity (sometimes called time-to-collision) from random-dot flow patterns are shown to be based upon retinal speed, rather than upon changes in dot density. Neither the spatial nor the temporal gradient of motion is essential to the task, but estimates can be made from either alone. Performance is unaffected by the addition of rotational motion, suggesting that observers axe capable of extracting the radial component of motion, which contains all the relevant information, from complex stimuli.
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Some of this work was carried out while M.G.H. was on study leave in the Department of Vision Sciences, Aston University, and some of it was supported by SERC Grant GR/H/52986.
— Accepted by previous editor, Charles W. Eriksen
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Freeman, T.C.A., Harris, M.G. & Tyler, P.A. Human sensitivity to temporal proximity: The role of spatial and temporal speed gradients. Perception & Psychophysics 55, 689–699 (1994). https://doi.org/10.3758/BF03211683
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DOI: https://doi.org/10.3758/BF03211683