Figure 1.

Example trial and experimental design. A, Participants were presented with unisensory auditory, unisensory visual and synchronous audiovisual signals originating from four possible locations along the azimuth. The visual signal was a cloud of white dots. The auditory signal was a brief burst of white noise presented via headphones. Participants localized either the auditory or the visual signal (note that for illustrational purposes the visual angles of the cloud have been scaled in a non-uniform fashion in this scheme). B, In the audiovisual conditions, the experimental design manipulated (1) the location of the visual (V) signal (−10°, −3.3°, 3.3°, 10°; 2) the location of the auditory (A) signal (−10°, −3.3°, 3.3°, 10°), (3) the reliability of the visual signal (low versus high standard deviation of the visual cloud; VR+ vs. VR-), and (4) modality-specific report (auditory versus visual). Only congruent (△AV = 0°; △AV = A - V) and slightly disparate conditions (△AV = ±6°) were used in this study. In unisensory conditions, the experimental design manipulated the location of the auditory signal in auditory conditions and the locations of the visual signals as well as visual reliability in visual conditions.