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In the presence of either a visual or an auditory discriminative stimulus, but not in their absence, dogs were required to depress a panel to avoid electric shock on a variable-interval limited hold schedule. Once avoidance responding had stabilized, the dogs received presentations of the auditory-visual compound as well as the elements in a test session. All dogs responded at a higher rate in the presence of the compound stimulus than in the presence of either element.

The effects of compounding discriminative stimuli that control variable-interval limited-hold avoidance