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Habituation has recently been addressed within the operant conditioning paradigm. While the literature on this topic is growing, the examination of dishabituation, a fundamental characteristic of habituation, remains limited. This study expanded research on habituation of operant responding in non-human animals to research involving humans. Specifically, dishabituation and stimulus specificity were examined under a variety of conditions involving changes in the reinforcer type, reinforcement schedule, reinforcer amount, and selected properties of the antecedent stimuli for a computerized task with 46 undergraduate students. An additional 3 participants were exposed to a control condition. Evaluation of within session patterns of responding indicates that the introduction of stimulus changes into the operant context reliably produced dishabituation of operant responding in humans. [ABSTRACT FROM AUTHOR]