Flooding is an alternative method also based on the behavioural approach which, instead of gradually going through levels of the feared stimulus, they get immersed in it as one long session until the anxiety has disappeared. For example, a fear of clows, the patient will be put in a room full of clowns until they remain calm. This is due to the fear response having a time limit. Adrenaline levels naturally decrease, which allows relaxation to be reassociated with the feared stimulus.