1. A method of assessing and/or diagnosing a neurobehavioural disorder in a subject, comprising: using a computational model to select one or more feature in a visual scene and generate a spatial map having first map values that are predictive of eye movement end points of a hypothetical observer relative to the one or more feature; recording the subject's eye movements while the subject freely observes the visual scene; and quantifying a difference between second map values that correspond to the subject's eye movement endpoints and a set of map values selected randomly from the first map values; wherein the difference is indicative of a neurobehavioural disorder in the subject.