Extraversion is not only a dimension on Jungian typologies such as the Myers-Briggs (i.e., Introversion-Extraversion), but one of the Big Five traits as well. Low Extraversion is often described as Introversion.
The NEO-PI also defines six subtraits or facets of Extraversion.
- Activity Level
- Excitement Seeking
High extraversion: Don't mind being the center of attention.
Low extraversion: Don't like to draw attention to myself.