Openness includes traits such as tolerance for ambiguity, extroversion and introversion, and open-mindedness. Eysenck compared levels of arousal to a scale of introversion versus extraversion. Jung's model suggests that the superordinate dimension of personality is introversion and extraversion. They later had to recall examples of her introversion and extroversion. Jungian introversion and extraversion is quite different from the modern idea of introversion and extraversion. The preferences for extraversion and introversion are often called "attitudes". Eysenck suggests that the latter is a result of a person's introversion or extraversion respectively. Mistaking introversion for shyness is a common error. Emo has been associated with a stereotype of emotion, sensitivity, shyness, introversion or angst. The functions are modified by two main attitude types&colon; extraversion and introversion. The four functions operate in conjunction with the attitudes (extraversion and introversion). Thin types were associated with introversion and timidity. Bhairav is grave in mood and suggests seriousness, introversion as well as devotional attitude. The hedgehog's dilemma is used to explain introversion and self-imposed isolation. Scanner Sombre is a cave exploration video game developed by Introversion Software.