Excerpt from Emotions Revealed pp. 213-215It was not my idea to find out how emotions might be useful in evaluating truthfulness.
The question arose nearly forty years ago when I first taught a class to psychiatric trainees at my university. While they were excited to hear about my research suggesting that emotional expressions are universal, what they really wanted was guidance about a critical decision they faced at the hospital: When a patient who had been admitted for acute depression requested a pass to return home for a day, claiming to feel much better and to no longer be thinking of suicide, how could they tell if the patient was telling the truth?
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