Peripheral optic-flow involvement in the multisensory construction of the 3D percept in humans
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1
Université Paul Sabatier, France
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2
CNRS, France
Problem statement. Optical flow in the peripheral field of view changes the assessment of distances (Watanabe et al., 2004, Systems and Computers in Japan, 35(8), 107-116) and we showed that peripheral motion influenced the foveal 3D percept of a stimulus situated 1m away from the subject (Maggia et al, 2009, 3rd Med Conf of Neuroscience. doi 10.3389/conf.neuro. 01.2009.16.112). Removing the fixation point that restrained vergence eye movements during the stimuli presentation strengthened the effect (Séverac Cauquil et al., 2010, AVA Christmas meeting). In this work, we investigated how 3D perception is modulated by peripheral optic flow when the stimulus is in the reaching space. Indeed it is in the near space that vergence and stereopsis predominate.
Approach. 13 healthy subjects indicated via a joystick the depth of circular random dot stereograms presented in the centre of a PC monitor 40-cm away from the subject, while dots scrolled on two, lateral monitors. 5 peripheral conditions were tested: divergent and convergent flow, Brownian motion, static dots and blank. Error rate and reaction times were measured.
Results. The optic flow changed the error rate in 3D perception: convergent flow clearly facilitated near perception and decreased far and, conversely, divergent flow elicited a better far perception and impaired near perception (±30%; repeated measures ANOVA, p<0.05). Controls (Brownian, static and blank) did not change the error rate (p=0.684).
Conclusion. This demonstrates that peripheral flow participates to 3D percept construction based on disparity in the reaching space. Convergent and divergent flows mimicking a backward or forward self-motion lead to a better 3D perception either in the near or far plane. Whether this effect is mediated by vergence remains possible and deserves further investigation.
References
Maggia et al, 2009, 3rd Med Conf of Neuroscience. doi 10.3389/conf.neuro. 01.2009.16.112
Séverac Cauquil et al., 2010, AVA Christmas meeting
Watanabe et al., 2004, Systems and Computers in Japan, 35(8), 107-116
Keywords:
3D vision,
depth,
Spatial Vision,
Eye Movements,
Optic Flow
Conference:
4th Conference of the Mediterrarnean Neuroscience Society, Istanbul, Türkiye, 30 Sep - 3 Oct, 2012.
Presentation Type:
Poster Presentation
Topic:
Abstracts
Citation:
Séverac Cauquil
A,
Rosito
M,
Loubet
M and
Celebrini
S
(2013). Peripheral optic-flow involvement in the multisensory construction of the 3D percept in humans.
Conference Abstract:
4th Conference of the Mediterrarnean Neuroscience Society.
doi: 10.3389/conf.fnhum.2013.210.00067
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Received:
29 Jan 2013;
Published Online:
11 Apr 2013.
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Correspondence:
Dr. Alexandra Séverac Cauquil, Université Paul Sabatier, Toulouse Cedex, 31052, France, alexandra.severac@cnrs.fr