 Psychologist Ethan Cross studies the phenomenon of self-talk and chatter, the voices we all hear incessantly inside our heads. We've seen how chatter can take the form of a merciless tormentor. Once baseball star Rick Ankeel made one mistake, his inability to set that mistake aside produced the next mistake, and the next, and the next. When Ethan accidentally hurt his young daughter, he found it really hard to forgive himself.