neurotism: biological basis - low sympathetic nervous system activation threshold
unable to control emotions + reaction
neuroticism: environment influences - forced stressful situations in environment make react in negative way
Eysenck created the personality questionnaire (EPQ) which criminals scored with high neuroticism and high extroversion
Criminals - high neuroticism and high extraversion because have less stimulation in the brain so need to seek people + activities to lift their mood. Childlike as don't learn from their mistakes