“…Topographical similarities of behavior during acquisition and extinction have been shown for the two preparations (see Kimble, 1961), and prior temporal conditioning has been found to facilitate fixed interval (FI) schedule control when the same temporal intervals are used (Trapold, Carlson, & Myers, 1965). Indeed, the only qualitative difference between operant and respondent contingencies that has been noted is the effect of partial reinforcement, which is more effective than continuous reinforcement in maintaining operant behavior but less effective than continuous reinforcement in maintaining respondent behavior (Crawford, Holloway, & Domjan, 1993). Clearly, operant and respondent conditioning are both forms of stimulus control, and the utility of any further distinction must be questioned.…”