Eysenck's Biological Basis of Personality

Eysenck's Biological Basis of Personality suggests that our personality traits are linked to genetic and brain differences. He proposed that individuals vary in levels of two main traits: extraversion (how outgoing or reserved they are) and neuroticism (their emotional stability). These traits are influenced by the activity of different brain systems: for example, extraverts may have a less active arousal system, making them seek stimulation, while neurotics may have a heightened sensitivity to stress. Overall, Eysenck believed that our biological make-up—brain structure and nervous system activity—shapes our personality tendencies.