THE SELECTION OF THE DELINQUENT SUBJECTS WAS MADE INDEPENDENTLY AT THE OUTSET IN ORDER TO TEST WHETHER EEG DYSRHYTHMIC DELINQUENTS, IN PARTICULAR, AND DELINQUENTS, IN GENERAL, SHOWED PERSONALITY TRAITS AS DESCRIBED BY EYSENCK (1964) AS EXTROVERTED NEUROTICISM. EYSENCK THEORIZED THAT DELINQUENTS FAILED TO CONDITION RAPIDLY AND WERE BOUND TO BE SLOW LEARNERS OF SOCIAL MORES. THE DELINQUENT AND CONTROL SAMPLES WERE COMPARED TO TEST TWO HYPOTHESES: (1) EEG DYSRHYTHMIC DELINQUENTS DIFFER FROM NONDYSRHYTHMIC DELINQUENTS ON FOUR BEHAVIORAL MEASURES (I.E., THE MAUDSLEY PERSONALITY INVENTORY, PLAYING MINIMAX GAMES, THE SPIRAL TEST OF MOTOR INHIBITION, AND SELF-RATINGS ON AN INVENTORY OF PERSONAL CONSTRUCTS); AND (2) THE COMBINED DELINQUENT GROUPS DIFFER FROM NONDELINQUENTS ON THE SAME MEASURES OF EXTROVERSION-NEUROTICISM, RISK TAKING, PSYCHOMOTOR INHIBITION, AND FUTURE-PAST DISCREPANCY RATINGS. THE RESULTS INDICATED SIGNIFICANT DIFFERENCES BETWEEN THE TWO EEG GROUPS ON THE FIRST TWO MEASURES, BUT NONE ON THE LAST TWO. ALL TESTS SHOWED SIGNIFICANT DIFFERENCES BETWEEN DELINQUENTS AND NORMAL SUBJECTS. FURTHER RESEARCH ON MEASURES OF SENSORY AND MOTOR CONTROL MAY STILL SUPPORT THE EEG AS A RELIABLE PREDICTOR OF DEVELOPMENTAL CHARACTERISTICS OF DELINQUENTS. REFERENCES AND TABULAR DATA ARE PROVIDED. (KBL)