Barpress avoidance responses produce little change in proprioceptive feedback and are extremely difficult for rats to learn. In contrast, avoidance responses, such as running to a safe place, produce a large change in proprioceptive feedback and are learned very rapidly. On the basis of these findings, Meyer, Cho, & Wesemann (1960) proposed that the reinforcement for avoidance learning might come from the change in proprioceptive feedback provided by the avoidance response. Contrary to this hypothesis, the rats in the present experiment had great difficulty in learning to avoid shock by jumping, a response which produces a large change in proprioceptive feedback.