Abstract
Two experiments tested the hypothesis that anticipation of shock could be established as a discriminative stimulus for an appetitive instrumental response. In multiphase experiments, bar pressing for food was brought under the discriminative control of intermittent and gradually increasing electric shock. In a second phase, tones were estalished as either a CS+, or CS− for shock. Subsequently, the CSs were introduced on to the operant baseline. Animals trained with shock as the S D showed an increase in responding to the CS+ and a slight decrease to the CS−. Conversely, animals trained with shock as the S Δ showed decreased responding to the CS+ and slight increase to the CS−. These findings are seen as supportive of the Discriminative Stimulus hypothesis of learned resistance to punishment.
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