Abstract
An intercorrelational analysis was performed on the measures of responding generated In Williamson Jiggle Cages, photocell cages, a revolving drum, a circular field, and a double-bar lever-pressing apparatus. The results showed that these measures were essentially independent of one another, though responding decayed in a consistent manner over the 2-hr. test session. Thus, these activity measuring devices assess different aspects of behavior although they are uniformly sensitive to the animal's habituation to the test environment.
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