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This paper reports two experiments testing the hypotheses that the rate and degree of verbal conditioning are inversely related to the personality variables of rigidity and extraversion, these predictions being based on theoretical formulations by psychologists, R.B. Cattell and H.J. Eysenck, respectively. The most striking finding was that the conditioning procedures did not induce reliable, i.e. repeatable, changes in performance. This result which precluded an adequate test of the hypotheses under investigation is in marked contrast to previous studies using this and other methods of conditioning, and requires explanation.