Trait-oriented perspectives are among the most fruitful theories of personality hi generating testable hypotheses and spawning wide-ranging research programs. Cat-tell, Eysenck, and Costa and McCrae have all developed widely used personality inventories, namely Cattell's Sixteen Personality Factors Questionnaire (16 PF, Cattell, 1949) and its offshoots; Eysenck's various inventories (Eysenck, 1959; Eysenck & Eysenck, 1964, 1968, 1975, 1993); and Costa and McCrae's NEO-PI (Costa & McCrae, 1985) and their revised personality inventory—the NEO-PI-R (Costa & McCrae, 1992).
Eysenck's interests and writings rank as the most diverse of any psychologist who ever lived. His topics have included astrology, crime and personality, Freud and psychoanalysis, abnormal psychology, race and ethnic background, violence in the media, politics, sexual behavior, personality assessment, cancer and smoking, hypnosis, humor, personality and heart disease, personality and cancer, behavior therapy, intelligence, vitamins, and creative genius. Furthermore, in all these writings, Eysenck took a biological and genetic perspective. Of the myriad topics discussed by Eysenck, we have chosen to review only a small subset of research.
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