general abilities personality similarities found less related self concepts goals interests ref name loehlin loehlin jc nichols rc ''hereditary environment personality study sets twins'' austin university texas press ref twin studies also important creation five factor personality model neuroticism extraversion openness agreeableness conscientiousness neuroticism extraversion two widely studied traits individuals scoring high trait extraversion often display characteristics impulsiveness sociability activeness individuals scoring high trait neuroticism likely moody anxious irritable identical
Social science Psychology Personality psychology