“…Skinner posited that schedules of reinforcement could ''transcend'' or ''erase'' species-specific differences and yield performance (such as cumulative records on FI schedules) that did not differ in essentials from one species to another. Although species differences in the temporal control of behavior do occur (e.g., Lejeune & Wearden, 1991;Lowe & Harzem, 1977), some aspects of timing do seem to have cross-species generality, supporting Skinner's position, and such generality even may extend to humans (e.g., Lejeune, 1990;Richelle, 1968;Richelle & Lejeune, 1984;Richelle, Lejeune, Perikel, & Fery, 1985;Wearden, 1991).…”