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The group solicited responses to a carefully graded spectrum of emotions starting with strong facial expressions classified as 100 per cent intensity and morphing by 10 per cent increments from extreme joy or sadness, for example, to neutral. Each participant was asked to say whether the face expressed happiness, sadness, anger, disgust or fear. “We arrived at the lowest intensity of expression needed for a person to start judging correctly the emotion it represented. We knew 100 per [...]