Abstract
As a white hourglass moves across a black background, the middle appears to lag behind its true position, resulting in the apparent bending of the axis of the hourglass. No such distortion occurs with a black hourglass moving across a white background. The results of two experiments support a visual persistence hypothesis, as opposed to a latency hypothesis.
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Walker, J.T., Frechmann, T.D. Dynamic form perception in the bending. Perception & Psychophysics 45, 231–236 (1989). https://doi.org/10.3758/BF03210702
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DOI: https://doi.org/10.3758/BF03210702