Although the content and direction of scored responses may be obvious in some cases, in other cases this is not true. In addition to such questionnaires, other, more objective measures have been devised. In this test a standard amount of lemon juice is placed on subject's tongue. Introverts and extraverts differ in the amount of saliva produced when this is done. A review of the dimension presents an impressive array of findings .
Introverts do better in school than extraverts, particularly in more advanced subjects.
Also, students withdrawing from college for academic reasons tend to be extraverts, whereas those who withdraw for psychiatric reasons tend to be introverts. Extraverts prefer vocations involving interactions with other people, whereas introverts tend to prefer more solitary vocations . Extraverts seek diversion from job routine , whereas introverts have less need for novelty . Extraverts enjoy explicit sexual and aggressive humor, whereas introverts prefer more intellectual forms of humor such as puns and subtle jokes. Extraverts are more active sexually, in terms of frequency and different partners, than introverts.