“…Increasing the intensity of a punisher, for example, can either enhance or degrade the efficacy of intermittent schedules, depending on other factors (e.g., Appel, 1968;Lande, 1981). Certain punishment schedules (e.g., VI) also have been associated with greater decreases in responding than other schedules (e.g., FR or FI; Azrin, 1956;Camp, Raymond, & Church, 1966), although the nature of this relation is complex (e.g., Arbuckle & Lattal, 1992) and appears to be influenced by the schedule of reinforcement that maintains the behavior (e.g., Bradshaw et al, 1977Bradshaw et al, , 1978Powell, 1970;Scobie & Kaufman, 1969).…”