Answer:
Halo Effect
Step-by-step explanation:
The halo effect is a cognitive bias in which our overall impression of a person influences how we feel and think about their character. In this case, the initial descriptions provided to the two groups of students created a positive or negative "halo" around their perception of the teacher, affecting their subsequent evaluations. The group told the teacher was humorous and easygoing formed a positive halo, leading them to report the teacher as easygoing. Conversely, the group told the teacher was rigid and hard to work with formed a negative halo, influencing their perception and causing them to report the teacher as rigid.