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The author’s main purpose is to ----.
Deception gains a slight edge over deception detection
when the interactions are few in number and are among
strangers. If you spend enough time with the people you
interact with, they may leak their true intent through
their behaviour. However, when interactions are
anonymous or infrequent, behavioural cues cannot be
read against a background of known behaviour, so
more general attributes must be used. Because of the
negative consequences of being detected, people are
expected to be nervous when lying. In response to
concern over appearing nervous, people may exert
control, trying to suppress behaviour, with possible side
effects detectable by the listener such as a planned,
rehearsed impression. Lying is also cognitively
demanding. You must suppress the truth and construct
a falsehood that is plausible, then tell it in a convincing
way and remember the story. Cognitive load appears to
play the biggest role. When lies are not well-rehearsed,
people have to think too hard, and this causes several
effects, including overcontrol that leads to blinking and
fidgeting less and using fewer hand gestures, longer
pauses and higher-pitched voices. Of course, if
self-deception is involved, you are less likely to give off
the normal cues of lying that others might perceive.