Adolescents report being most motivated by encouragement from people who know their abilities and the domain.

Students often receive encouragement but do not always find it motivating. Whose encouragement motivates students and what cognitive mechanisms underlie this process? We propose that students' responses to positive feedback (e.g., encouragement) hinge on mental state representations, specifically what the speaker knows. Across three studies, we find that U.S. adolescents (n = 581-759 11- to 19-year-olds per study, preregistered; > 80% racial/ethnic minorities; > 36% low income) report being more motivated by, more confident in, and more likely to seek out encouragement from hypothetical and real-world speakers (e.g., parents, teachers, peers) who are knowledgeable about both their abilities (e.g., students' math skills) and the task at hand (e.g., math). To make feedback most effective, our findings suggest that students should seek and receive encouragement from those who know them and their activities well. (PsycInfo Database Record (c) 2025 APA, all rights reserved).