title: Announcing the great frame-tilt judging contest.
abstract: A contest is used to dramatize the fact that in all rod-and-frame studies, the investigator rather than the observer has defined direction of frame tilt and this is a serious theoretical and methodological error.
mesh_terms: D005364:Field Dependence-Independence; D005556:Form Perception; D006801:Humans; D007088:Illusions; D009903:Optical Illusions