Personality traits and the normal electro-encephalogram.

1. Personality traits of a group of alcoholic patients were obtained from a Standard Interview and compared with EEG tracings. 2. This group did not present any typical personality picture of the alcoholic but rather indicated that apart from their drinking and its effects alcoholics have little in common. 3. A dichotomy of personality traits was obtained which appears to be related to the EEG tracing as a whole and not to any one frequency index. 4. A grouping of qualities suggesting extraversion is apparently related to a predominance of high frequency activity in the EEG, and introversion to a predominance of alpha activity.