Answer:
Mood linkage
Explanation:
A human being has the ability to observe their social settings and then absorb it. By doing this, an individual regulates their emotions and mood as per the environment in which they are. In psychology, this is referred to as mood linkage where we link our mood to the environment. Here, Tom is originally in a bad mood but then at the party, people are laughing and having a good time so he absorbs that cheerful environment and cheers up himself. Hence, linking his mood to the environment or mood linkage.