He went through some history first, from the asylums of old through Freud (not scientific) and prefrontal lobotomies (bad) and shock treatments (OK sometimes) through medications (improvements) and the latest scanning techniques. He admits that progress in mental health understanding and treatments lag behind those in physical medicine. He wants and expects mental health treatments to become more "scientific" and thinks that advances in brain-scanning techniques and the understanding of how brain cells communicate will be the paths to those advances. I think people nowadays emphasize that too much, neglecting psychology for "brain science". I think that "brain science" should be a complement to psychological understanding, not a replacement for it.