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Eight rats, previously trained on a variable interval (VI-30 sec) schedule for food reinforcement, received two days of adaptation to tones and five days of classical discrimination conditioning in which one of two tones was paired with shock. The major findings were (a) responses to the CS+ included bar-press (B-P) suppression and a decrease in heart rate (HR); (b) responses to the CS− included B-P facilitation and an increase in HR; (c) changes in HR conditioned more slowly than changes in B-P; and (d) the HR response topography indicated that most HR responding occurred in the latter half of the CS-US interval.

Classical discrimination conditioning of heart rate and bar-press suppression in the rat