In 1974 Laird manipulated participants' faces into either a happy expression or an angry expression in order to investigate the influence of the facial expression on the intensity of the emotional experience. Laird was directly testing the:

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Laird's study directly tested the facial feedback hypothesis, which suggests that the facial expressions we make can influence our emotional experiences. By manipulating participants' facial expressions into either a happy or angry expression, Laird was testing whether changing the physical expression on the face can lead to changes in emotional experience.

In 1974 Laird Manipulated Participants' Faces into Either a Happy