Abstract
Discrimination of the extent of a motion path may present a special problem since the discrimination calls on memory for changing position and involves pursuit movements of the eye. To determine how these factors affect judgment, discrimination of extents represented by motion paths, successively appearing endpoints, and simultaneously present endpoints was compared under a variety of eye-movement conditions: fixation, pursuit, and saccadic. Discrimination was assessed by the method of adjustment and also by the method of magnitude estimation. Discrimination of motion path extent was found to be as accurate as discrimination of an interspace demarcated by simultaneously presented points or by successively presented points. This was true for brief single presentations of the extents as well as for repeated exposures to the extents. The findings were applied to the analysis of the perception of velocity and the perception of extent.
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Shebilske, W. Personal communication, November 20, 1976.
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Epstein, W., Hanson, S. Is the discrimination of motion-path length unique?. Perception & Psychophysics 22, 152–158 (1977). https://doi.org/10.3758/BF03198748
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DOI: https://doi.org/10.3758/BF03198748