German-British psychologist who developed the PEN model of personality (Psychoticism, Extraversion, Neuroticism) and was the most controversial psychologist of his generation for his work on IQ and race.
PEN model: personality is biological — extraversion/introversion reflects cortical arousal thresholds; neuroticism reflects sympathetic nervous system reactivity. Critiqued Freudian psychoanalysis as scientifically unfounded. IQ and racial differences: controversial claims that are now largely discredited; posthumous investigations found data irregularities in his cancer-personality research.
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