Abstract
Do operant wheel running rates that produce the delivery of sucrose on a schedule of reinforcement increase due to adjunctive or reinforced behavior? The current study addressed this question by exposing seven female Long Evans rats in running wheels to a fixed ratio (FR) 40 schedule. Across three conditions, the 40th revolution on this schedule produced the delivery of a drop of 0% (water), 25%, and 0% sucrose solution. Operant wheel-running rates, at a session level, were significantly higher when 25% sucrose was delivered. Median PRPs increased systematically with the consumption of sucrose. Wheel-running rates increased equivalently over all revolutions on the FR 40 for most rats, with only one rat showing an adjunctive pattern of increased running over earlier revolutions. Consequently, it was concluded that the increase in operant wheel-running rates, in the current, as well as prior studies using FR schedules, was due to reinforced rather adjunctive behavior.
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