The idea that the brain is constantly processing information of which we remain unaware is widely attested in the brain and behavioural sciences (see blindsight). It is also widely agreed that people may have beliefs and desires that they cannot represent to themselves without processes of assistance. The methodological problem that such processes face is to distinguish between uncovering genuine unconscious beliefs and desires, and gratuitously reading them into a subject’s behaviour. More detailed theories of the form such assistance should take, and of the lurid content unconscious beliefs and desires are often supposed to possess, are controversial. See Freud, psychoanalysis.