My book Making Up the Mind is partly a scientific autobiography, describing a career that seems to have taken a satisfyingly circular course. This has progressed from an interest in the newest mathematical approaches to human behaviour, to the study of schizophrenia via behaviourism and clinical psychology, to cognitive neuropsychology and new techniques of brain imaging. Now I find myself almost back where I began, as I embark on a project to model human social interactions in terms of Bayesian learning algorithms, and watch in admiration as colleagues achieve so much with this approach.