Abstract
Seven rats were given 1-min buzzer presentations during Sidman avoidance (Experiment 1). Four of these Ss with a classical conditioning history (light-shock pairings) were also given light presentations alone and light-buzzer presentations during avoidance (Experiment 2). The buzzer presentations increased avoidance rates (unconditioned acceleration) and the light-buzzer compound increased rates even further than either stimulus alone (summation effect).
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Riess, D. The buzzer as a primary aversive stimulus: I. Unconditioned acceleration and summation of conditioned and unconditioned acceleration. Psychon Sci 21, 167–169 (1970). https://doi.org/10.3758/BF03331867
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DOI: https://doi.org/10.3758/BF03331867