Interpersonal learning is a complex therapeutic factor in group therapy that parallels key individual therapy processes, emphasizing the importance of interpersonal relationships in therapy. The document discusses concepts such as the corrective emotional experience and the idea of the group as a social microcosm, highlighting how one's self-perception is shaped by interpersonal interactions and the impacts of relational dynamics. It emphasizes that therapeutic change often involves shifting from personal suffering to improving interpersonal functioning, with evidence showing that meaningful connections are vital for mental health and well-being.