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This research was supported by NSF Research Grant BNS 85-11685 to the second author.
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McBeath, M.K., Shepard, R.N. Apparent motion between shapes differing in location and orientation: A window technique for estimating path curvature. Perception & Psychophysics 46, 333–337 (1989). https://doi.org/10.3758/BF03204986