Visual target localization, the effect of allocentric audiovisual reference frame
Last modified: 2011-09-02
Abstract
Visual allocentric references frames (contextual cues) affect visual space perception (Diedrichsen et al., 2004; Walter et al., 2006). On the other hand, experiments have shown a change of visual perception induced by binaural stimuli (Chandler, 1961; Carlile et al., 2001). In the present study we investigate the effect of visual and audiovisual allocentred reference frame on visual localization and straight ahead pointing. Participant faced a black part-spherical screen (92cm radius). The head was maintained aligned with the body. Participant wore headphone and a glove with motion capture markers. A red laser point was displayed straight ahead as fixation point. The visual target was a 100ms green laser point. After a short delay, the green laser reappeared and participant had to localize target with a trackball. Straight ahead blind pointing was required before and after series of 48 trials. Visual part of the bimodal allocentred reference frame was provided by a vertical red laser line (15° left or 15° right), auditory part was provided by 3D sound. Five conditions were tested, no-reference, visual reference (left/right), audiovisual reference (left/right). Results show that the significant effect of bimodal audiovisual reference is not different from the visual reference one.
References
S. Carlile, S. Hyams, et S. Delaney, “Systematic distortions of auditory space perception following prolonged exposure to broadband noise,” The Journal of the Acoustical Society of America 110 (2001): 416.
K. A. Chandler, “The effect of monaural and binaural tones of different intensities on the visual perception of verticality,” The American Journal of Psychology 74, n°. 2 (1961): 260–265.
J. Dieddrichsen et al., “Immediate spatial distortions of pointing movements induced by visual landmarks,” Perception & Psychophysics 66, n°. 1 (Janvier 1, 2004): 89-103.
E. Walter & P. Dassonville, “Fragments of the Roelofs effect: A bottom-up effect equal to the sum of its parts,” Perception & psychophysics 68, n°. 8 (2006): 1243.
K. A. Chandler, “The effect of monaural and binaural tones of different intensities on the visual perception of verticality,” The American Journal of Psychology 74, n°. 2 (1961): 260–265.
J. Dieddrichsen et al., “Immediate spatial distortions of pointing movements induced by visual landmarks,” Perception & Psychophysics 66, n°. 1 (Janvier 1, 2004): 89-103.
E. Walter & P. Dassonville, “Fragments of the Roelofs effect: A bottom-up effect equal to the sum of its parts,” Perception & psychophysics 68, n°. 8 (2006): 1243.