Final answer:
Julian is displaying critical thinking by analyzing group members' arguments, finding them unpersuasive, and deciding not to change his mind.
Step-by-step explanation:
When Julian listens to his group members' arguments but finds them unpersuasive and decides not to change his mind, he is displaying a form of critical thinking. Critical thinking involves evaluating information and arguments to make a reasoned judgment. It shows that Julian is analyzing the given arguments and is not swayed by them purely on the basis of group consensus or pressure, but rather, he remains steadfast in his own conclusions after considering the evidence presented to him.