Abstract
Food-deprived pigs reliably displayed schedule-induced chain pulling when submitted to intermittent food presentations spaced 4 min apart. No consistent drinking emerged under these conditions. Chain pulling was accompanied by decreased pituitary-adrenal activity as indicated by changes in plasma corticosteroid concentrations between the beginning and the end of the experimental session. When the opportunity to engage in adjunctive activities was suppressed, corticosteroid levels did not fall below the presession levels. Comparison of animals being able to engage in adjunctive activities with animals unable to do so showed that presession levels of plasma corticosteroids were higher in the former group than in the latter, while postsession plasma corticosteroids did not differ. In addition, the opportunity to engage in adjunctive activities did not protect the animals from the activating effects of extinction on the pituitary-adrenal axis. These results are discussed with reference to current theories about the role of adjunctive activities.
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