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A self-report instrument (PVB), designed to measure Predispositions toward Verbal Behavior, was found to have acceptable internal reliability, content validity, moderate construct validity, and strong criterion-related validity. Subjects were found to have a generalized cognitive orientation toward their speech patterning that correlated positively with number of words and duration of talk in both highly-structured interviews and unstructured discussion situations.
Mortensen et al. (Sat,) studied this question.