This study investigates the audio-visual spatial congruence in distance dimension in the case of virtual environments. A perceptual study is conducted in which visual targets are presented using a passive 3D projector, and accompanying virtual sounds are simulated by Wave Field Synthesis. Audio-visual stimuli are spatially congruent in azimuth and elevation, but a discrepancy is introduced in the distance dimension. For each tested visual distance (2, 3, 4 and 5 m), three audio stimuli are presented at 10 distances (1, 1.5, 2, 2.5, 3, 3.5, 4, 5, 7, and 10 m). After each presentation, participants have to estimate whether or not the sound is at the same place as the visual object. Results show that there is a significant range of audio conditions which are perceived as spatially congruent for each tested visual distance. Moreover, these integration windows tend to increase as the distance of visual stimuli increases. Finally, no significant effect of the stimulus is found in this study even though slight differences are locally observed.
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