Abstract
Positive behavioral contrast has been observed when pigeons press treadles on multiple schedules for high rates of reinforcement, but not for low rates. Negative treadle-press contrast has been observed for low rates of reinforcement. Two experiments showed that differences between response rates emitted during simple and multiple schedules appear and fail to appear under similar conditions. The experiments showed that the rate of pressing during the less favorable component of a multiple schedule was less than the rate of pressing during a comparable simple schedule (negative contrast). The rate of treadle–pressing during the more favorable component was not greater than the rate of pressing during a comparable simple schedule, when the schedules provided a low rate of reinforcement (absence of positive contrast), but it was when the schedules provided a high rate of reinforcement (positive contrast). These results help to clarify the definition of behavioral contrast by showing that simple schedules may be appropriate baselines from which to define and measure contrast.
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