One idea critical to increasing a person's persuasiveness is the so-called “halo effect” — which doesn't receive as much attention as it should.
When we judge others positively in one aspect of their lives, we often judge them positively in other unrelated aspects. This is known scientifically as exaggerated emotional coherence, and more commonly referred to simply as the halo effect.
Edward Thorndike first observed the halo effect in 1920 via a paper called “The Constant Error in Psychological Ratings,” which analyzed military officer rankings of subordinates. If a soldier boasted a strong physical appearance, he also was considered to have impressive leadership abilities. If he were loyal, he also was rated as highly intelligent.
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