title: Facilitation effects with the order of presentation of the Necker cube and Schroeder staircase.
abstract: Each of 6 men and 23 women, recruited from upper division college classes was assigned to one of two conditions of viewing ambiguous figures. To Group 1 (4 men, 10 women) was presented the Schroeder stair first, then the Necker cube, while to Group 2 (2 men, 13 women) the illusions were presented in the opposite order. During 6 blocks each subject passively viewed the first figure for 3 min., followed by a 3-min. rest, and then viewed the second figure for 3 min. Subjects indicated verbally when they perceived shift. There was no significant facilitation but reversals increased when subjects viewed the same figure for a second time.
authors.affiliation: North Central Kansas Special Education Coop Phillipsburg.
authors.forename: J
authors.initials: J
authors.lastname: Beer
mesh_terms: D000328:Adult; D001288:Attention; D003867:Depth Perception; D004193:Discrimination Learning; D005260:Female; D006801:Humans; D008297:Male; D009903:Optical Illusions; D010364:Pattern Recognition, Visual