Absent Audiovisual Integration Elicited by Peripheral Stimuli in Parkinson’s Disease

Figure 1

Schematic description of the experimental design. An example of a stimulus used to form a possible trial sequence is shown. After fixation for 3000 ms at the beginning of the session, all the auditory, visual, and audiovisual stimuli were presented randomly with a random interstimulus interval (ISI) of 2000–3000 ms. Following the presentation of each stimulus, the subject was instructed to identify which hemispace was presented by pressing the right or left button of a mouse as rapidly and accurately as possible.