1. A method of assessing, diagnosing, or assessing and diagnosing a neurobehavioural disorder in a subject, comprising: using a processor-based 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 generating second map values that correspond to the subject's eye movement endpoints that do not rely on the subject performing a task; quantifying a difference between the second map values 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.