We presented participants with videos of Duchenne smiles that differed in the duration of their onset, offset, or both to determine if this would affect perceived expression authenticity. The duration of onset and offset varied between 0.2 and 1.0 s. Participants were shown one smile at a time and were asked to judge its genuineness on a rating scale. Results indicated the duration of offset had an effect on perceived genuineness when it was manipulated in isolation. Similarly, when both the offset and onset duration were adjusted concomitantly, genuineness ratings were affected. There was no effect of onset duration when it was manipulated in isolation. This is the first demonstration of these effects using photographs of real human faces that are dynamically and morphologically symmetrical, and which have been validated via the Facial Action Coding System.

我们为参与者提供了杜兴微笑的视频，这些视频的发作，偏移时间或两者的持续时间有所不同，以确定这是否会影响感知的表情真实性。发作和偏移的持续时间在0.2到1.0 s之间变化。一次向参与者展示一个微笑，并要求他们根据等级量表判断其真实性。结果表明，偏移量的持续时间对孤立操作时的感知真实性有影响。同样，当同时调整偏移和发作持续时间时，会影响真伪评级。单独控制发作持续时间没有影响。这是使用动态和形态对称的真实人脸照片对这些效果的首次展示，