title: Dynamic form perception in the bending hourglass: effects of contrast reversal and visual persistence.
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.
authors.forename: J T
authors.initials: JT
authors.lastname: Walker
authors.forename: T D
authors.initials: TD
authors.lastname: Frechmann
mesh_terms: D000328:Adult; D005260:Female; D005403:Fixation, Ocular; D005556:Form Perception; D006801:Humans; D007088:Illusions; D008297:Male; D009039:Motion Perception; D009903:Optical Illusions; D011930:Reaction Time