Trevor, a high school senior, has always been a great student. However, in the last few months, he has quit the soccer team, lost interest in hanging out with his friends, and has seen a severe drop in his grades. Even though he has always been very close to his parents, Trevor refuses to talk to them regarding his behavior change. As a result, his parents decide to take him to a doctor. His doctor feels Trevor is suffering from clinical depression as a result of a concussion he received earlier in the season. Which perspective BEST explains Trevor's behavior according to his doctor