Peter Lewinsohn

Peter Lewinsohn is a psychologist known for his research on depression, particularly how it develops and maintains itself. He proposed that depression can result from a lack of positive reinforcement—meaning fewer rewarding activities or social interactions, which can lead to feelings of sadness and withdrawal. His work suggests that increasing positive experiences and social engagement can help treat depression. Lewinsohn's theories have influenced cognitive-behavioral therapy approaches, emphasizing the importance of activity and reinforcement in improving mood and mental health.