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51. all introverts are constantly … vigilant
about threats: Indeed, many contemporary
personality psychologists would say that
threat-vigilance is more characteristic of a
trait known as “neuroticism” than of introversion
per se.
52. threat-vigilance is more characteristic of
a trait: But harm avoidance is correlated
with both introversion and neuroticism
(both traits are associated with Jerry
Kagan’s “high reactivity” and Elaine Aron’s
“high sensitivity”). See Mary E. Stewart et
al., “Personality Correlates of Happiness
and Sadness: EPQ-R and TPQ Compared,”
Personality and Individual Differences 38, no.
5 (2005): 1085–96.
53. “If you want to determine”: can be found
at http://www.psy.miami.edu/faculty/
ccarver/sclBISBAS.html. I first came across
this scale in Jonathan Haidt’s excellent
book, The Happiness Hypothesis: Finding