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Hans J. Eysenck (1916-1997) was a European psychologist who was the first to study personality using a method known as factor analysis. He maintained that one's personality can he understood in terms of only two basic dimensions, these are the Introversion-extroversion and stability-Instability (neurotism) dimensions. Eysenck suggested a biological basis for personality traits as he linked introversion-extroversion and stability-instability to differences in individual's normal pattern of arousal within the brain.