Final answer:
Vicki's nephew experiencing laughter and a positive change in emotion after playing a silly game illustrates the facial feedback effect, where facial expressions can influence emotional experiences.
Step-by-step explanation:
Vicki's efforts in cheering up her nephew by convincing him to play a silly game which leads to laughter and fun is an instance demonstrating the facial feedback effect. This concept suggests that facial movement can influence emotional experience. For instance, smiling can make one feel happier, as proposed by the facial feedback hypothesis. This hypothesis is supported by research that has found facial expressions do contribute to the emotional feelings individuals experience. In this context, Vicki's nephew began to have a more positive emotional experience after engaging in the activity that encouraged laughter.