Abstract
One study was conducted to evaluate the effect of varying the reinforcement probability and availability in a temporally-defined schedule. Twelve male albino Wistar rats were divided into three groups. Each group were exposed to a three experimental phases with reinforcement probability (p) set at 1.0, 0.5 and 0.1. Into every experimental phase, there were set four blocks of different reinforcement availability values (Ť= 1.0, 0.5, 0.3, 0.1). The results suggest that response frequency decreased systematically with overall reinforcement probability. However, this effect seems to depend on T cycle duration. On the other hand, data shows a decrement function in percentages of water deliveries associated to decrements in water delivery availability (Ť). These results are examined in relation to properties of temporally-defined schedules and the local distribution of water deliveries and responses.
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