Methods: The Prism Task

In the basic PRISM task, participants are shown a white A4-size (21×29.7 cm) metal board with a fixed, yellow circle 7 cm in diameter in the bottom right-hand corner. The patient is asked to imagine that the board represents his/her life as it is currently, and the yellow disk represents the patient's “self.” The patient is then handed a red disk, 5 cm in diameter, with a magnetic strip on its underside, so that it can be attached to the board. The patient is asked to imagine that the red disk represents his/her illness and is asked, “where would you put the illness disk in your life at the moment?” Standard instructions for the task are given in the Table 1 below.