Intelligence, EEG, Personality Deviation, and Criminality in Patients with the XYY Syndrome

Abstract

Comparatively high intelligence level has recently been reported as an exception in patients with the chromosome constitution XYY (Borgaonkar et al. (1968), Forssman et al. (1968), and Leff and Scott (1968)). We found, however, normal or high intelligence level in all nine patients with the XYY syndrome diagnosed in our laboratory and found in psychiatric institutions (full scale IQ, by WAIS 99, 90, 93, 100, 120, 93, 96, 98, and IQ low in the normal range).