“…Instead, most studies focused on the effects of particular types of reinforcers, such as praise (Bergen, et al, 1971;Hurlock, 1925;Roth and McManis, 1972;Tiber and Kennedy, 1964), tokens (Ayllon and Kelly, 1972), verbal reproof (Hurlock, 1925;Tiber and Kennedy, 1964), and candy (Edlund, 1972;Tiber and Kennedy, 1964) on test performance. In some of the studies (Bergan et al, 1971;Edlund, 1972;Roth and McManis, 1972), subjects received reinforcement immediately after every correct response.…”