Introspection is the subject of investigations in both philosophy and psychology. 1 Philosophers are often concerned with the seemingly privileged status of those beliefs formed through introspection and the metaphysical import of the views that try to account for it. By contrast, psychologists seem to be more concerned with the reliability of introspection as well as its scope. There seem to be some connections between these issues, but it is not clear how exactly philosophical research and psychological research on introspection relate to each other. How do philosophical theories of introspection constrain the empirical research carried out by psychologists? How do psychological data inform the conceptual work being done by philosophers?