Abstract
In 3 experiments, free wheel turning by rats produced either (a) 15-sec. termination of a buzzer, (b) 15-sec. onset of a buzzer, (c) 15-sec. termination of a buzzer having its higher-frequency sounds filtered out, (d) 15-sec. termination of a 4,000-cps tone, (e) 15-sec. onset of a 4,000-cps tone, (f) no stimulus change, and (g) no stimulus change with the buzzer continuously sounding. A and c evoked escape responding. D, e, f, and g were intermediate and largely indistinguishable. B evoked less performance than f, and appeared to suppress responding. Female Ss generally outperformed males.

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