Final answer:
The situation described is an example of a self-fulfilling prophecy and confirmation bias, where initial friendly behavior based on expectations of Jim's character led to a friendly response from Jim, reaffirming the original belief.
Step-by-step explanation:
The scenario described is an example of a self-fulfilling prophecy, where initial expectations about a person’s behavior can lead to actions that cause these expectations to come true. In this case, because you expected Jim to be friendly (based on prior information), you behaved friendly towards him, which led to Jim responding in a friendly manner as well. This confirmation bias reinforced your initial belief about his character.
Confirmation bias is the tendency to search for, interpret, favor, and recall information in a way that confirms one's preexisting beliefs or hypotheses. It is a type of cognitive bias that involves attention to and processing of information that is consistent with one's existing beliefs.
It's worth noting that interaction like this can also contribute to building in-group bias, a preference for our own group, or circle of acquaintances, over others.