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Graziano, in an e-mail dated July 31, 2010,
refers to introversion/extroversion as “the
300 lb. gorilla of personality, meaning that
it is big and cannot be ignored easily.”
11. in the Bible: See “A Note on Terminology.”
12. 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,”