An apparatus and method for modifying a psychophysiological state of a subject (150) is presented. The method comprises the steps of: detecting a psychophysiological measure of the subject; processing the detected physiological measure so as to provide a signal indicative of a psychophysiological state of the subject; outputting at least one of an audio stimulus, visual stimulus, haptic stimulus, temperature stimulus and scent stimulus (176, 177) to the subject the output stimulus being derived from an audiovisual data signal provided to the apparatus; and adjusting the output stimulus in real time based on the signal indicative of a psychophysiological state of the subject.