title: The effects of the stimulus setting and of variability in delayed reinforcement on children's visual orientation and speed of lever movement.
mesh_terms: D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D009048:Motor Skills; D009949:Orientation; D012055:Reinforcement Schedule; D012054:Reinforcement, Psychology; D014785:Vision, Ocular