A new study suggests that depressed people suffer from an inability to rid themselves of negative thoughts because they can’t turn their attention to other things. “They basically get stuck in a mindset where they relive what happened to them over and over again,” said study co-author Jutta Joormann of the University of Miami in an Association for Psychological Science news release. “Even though they think, ‘Oh, it’s not helpful, I should stop thinking about this, I should get on with my life,’ they can’t stop doing it.”