“…Zeiler, 1978). However, studies with human subjects have not been uncommon, beginning as early as the 1940s (e.g., Warren & Brown, 1943) and continuing to the present (see Buskist & Miller, 1982). The results reported in the initial studies with humans generally replicated those reported with nonhumans (e.g., Holland, 1958), but as the literature grew, some differences emerged, primarily in the area of schedules of reinforcement (e.g., Laties & Weiss, 1963;Long, Hammack, May, & Campbell, 1958), Schedules of reinforcement, defined as the manner in which reinforcements are assigned to particular responses (Catania, 1968, p. 345), may be the most thoroughly researched topic in EAB (Morse, 1966, p. 57).…”