Quiet: The Power of Introverts in a World That Can\'t Stop Talking pdfdrive com

some evolutionary psychologists
: See 
chapter 6
.
13.
 
one third to one half of Americans are introverts
: Rowan Bayne, in 
The Myers-Briggs Type
Indicator: A Critical Review and Practical Guide
(London: Chapman and Hall, 1995), 47, finds
the incidence of introversion at 36 percent, which is in turn determined from Isabel Myers’s
own study from 1985. A more recent study, published by the Center for Applications of
Psychological Type Research Services in 1996, sampled 914,219 people and found that 49.3
percent were extroverts and 50.7 percent were introverts. See “Estimated Frequencies of the
Types in the United States Population,” a brochure published by the Center for Application
of Psychological Type (CAPT) in 1996 and 2003. That the percentage of introverts found by
these studies rose from 36 percent to 50.7 percent doesn’t necessarily mean that there are
now more introverts in the United States, according to CAPT. It may be “simply a reflection
of the populations sampled and included.” In fact, a wholly separate survey, this one using
the Eysenck Personality Inventory and Eysenck Personality Questionnaire rather than the
Myers-Briggs test, indicates that extraversion scores have increased over time (from 1966 to
1993) for both men and women: see Jean M. Twenge, “Birth Cohort Changes in
Extraversion: A Cross-Temporal Meta-Analysis, 1966–1993,” 
Personality and Individual
Differences
30 (2001): 735–48.
14.
 
United States is among the most extroverted of nations
: This has been noted in two
studies: (1) Juri Allik and Robert R. McCrae, “Toward a Geography of Personality Traits:

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Patterns of Profiles Across 36 Cultures,” 
Journal of Cross-Cultural Psychology
35 (2004): 13–
28; and (2) Robert R. McCrae and Antonio Terracciano, “Personality Profiles of Cultures:
Aggregate Personality Traits,” 
Journal of Personality and Social Psychology
89:3 (2005): 407–
25.