title: Experienced lengthening and shortening of a straight line fixated in the middle and briefly exposed.
mesh_terms: D000328:Adult; D005260:Female; D005403:Fixation, Ocular; D005556:Form Perception; D006801:Humans; D007088:Illusions; D008297:Male; D009949:Orientation; D012858:Size Perception; D014796:Visual Perception