Abstract
The investigation aimed at determining the effect of three levels of intelligence - bright, average and dull and four groups of the personality - stable, neurotic and extravert, introvert - on verbal conditioning. On the basis of their scores on two intelligence tests and JPI, 72 children, half of each sex, were experimented through Taffcl’s Sentence Completion method. The results showed that dull subjets conditioned best, followed by average and bright subjects. The introverts conditioned better than extraverts, supporting Eysenck’s theory. The stables conditioned better than the neurotic subjects.