Answer:
Facial Feedback hypothesis
Explanation:
The facial feedback hypothesis states that facial movement can actually affects emotional experience. For example, one person who's not feeling happy but puts a big smile on his/her face will start feeling happy and experiencing feelings of joy.
In this example, you are experiencing envy, but you are both grinning from ear to ear so you start feeling excited along with him. According to this theory, that happened because your facial muscles movement actually had an influence on your emotional experience.
Thus, this reaction supports the Facial Feedback hypothesis regarding the origin and intensification of emotion.
