An automated method and computer interface for stimulating a user to develop and/or alter their implicit attitudes towards behavioural objects, such as dieting, alcohol consumption or exercising etc. The method comprising presenting a series of stimuli to the user within a test environment, each stimulus being associated with a behavioural object. The test environment may be a computer display screen, wherein the method designates a first zone within the environment as a positive behavioural association region and designates a second zone within the environment as a negative behavioural association region. The method further prompting the user to categorise each stimulus by moving the stimulus to either the first zone or the second zone, wherein positively categorising stimuli causes the user to develop improved implicit attitudes towards the behavioural objects associated with those stimuli in the first zone. The invention is particularly suited for implementation within web-browser and desktop environments.