1. An apparatus for automatically analysing the behaviour of a subject, the apparatus comprising: a detector for making one or more non-invasive visual observations of the subject each consisting of a plurality of measurements over a given period of time, wherein the detector comprises a camera providing images of the subject in the form of a plurality of frames; a coder comprising (i) object locators configured to extract predefined features from the plurality of frames, (ii) pattern detectors configured to recognise a plurality of patterns for each of the features extracted by the object locators, (iii) channel coders for coding the data from the object locators and pattern detectors into a plurality of channels, each channel comprising channel information for each of the plurality of frames and (iv) grouped-channel coders for collating data from each of said channels to produce a vector, said vector comprising a plurality of vector elements, each of said vector elements being associated with a respective one of said plurality of channels and being based upon said channel information for the respective channel for each of the plurality of frames, such that said vector represents channel statistics over a period of time in which said one or more non-invasive visual observations of the subject are made; and an automatic machine classifier adapted to analyse the vector and output information relating to the psychology of the subject.