title: Effect of the standard on size of the horizontal-vertical illusion.
abstract: 70 subjects participated in a study designed to replicate the 1968 claim of Gardner and Long that the horizontal-vertical illusion is larger with the vertical than with the horizontal as standard. The effect did not appear in Exp. 1 when subjects made judgments under both the reproduction and graded-series methods but did in a pilot study and in Exp. 2, although more strongly with the method of reproduction.
authors.forename: S J
authors.initials: SJ
authors.lastname: McKelvie
mesh_terms: D000328:Adult; D006801:Humans; D009903:Optical Illusions; D009949:Orientation; D010364:Pattern Recognition, Visual; D010865:Pilot Projects; D012858:Size Perception