People {extroversion}| {changeableness} can change in response to others or environment. Galen's choleric and sanguine types are changeable, unlike his melancholic and phlegmatic types. Extroversion has resting states with low cortical arousal. Extroversion is not dominant trait. Heredity causes two-thirds of extroversion-introversion variation.
People {introversion}| can have resting states with high cortical arousal, caused by ascending reticular activating system. Introversion is not dominant trait. Heredity causes two-thirds of extroversion-introversion variation.
Extroversion and introversion {ambiversion} can mix.
6-Psychology-Personality-Kinds
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Date Modified: 2022.0225