Abstract: Psychological explanation is a kind of functional explanation, like some biological explanation, where the relevant functions tend to have to do with perceiving and acting in relation to the environment. Pain serves as a kind of alarm system; perception allows an organism to get information about the environment etc. Although there are defenders of a narrow, more solipsistic psychological functionalism, the dominant trend has involved the wider version. In any event, the wider functionalism is clearly more plausible and methodological solipsism in psychology is incoherent.

Keywords: action, functionalism, methodological solipsism, perception, psychological explanation,