AP 41- The influence of background topography on stereo-acuity

Aurora Torrents Gómez, Genís Cardona, Universitat Politècnica de Catalunya José Antonio Aznar-Casanova, Institut for Brain, Cognition and Behaviour (IR3C) Universitat de Barcelona

ISBN: 1988-5253 ·
2011 · 16.5x23.5 cm

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Human depth perception can be strongly affected by the characteristics of the environment. Previous studies have assessedvisual acuity in the frontoparallel plane but little is known about the effect of background topography on stereoacuity.In the present experiment, based on alignment tasks, we analyzed how stimulus orientation and 3D background configurationinfluence stereoscopic vision. An experiment was designed to investigate the influence of stimulus orientation (0, 45 and90 degrees) and background configuration (flat, black, concave and convex) on precision in 3D visual alignment tasks in avirtual environment. Background was found to result in an underestimation of stereoacuity, with the highest and lowest precisionscores in comparison judgment tasks corresponding to convex and concave backgrounds, respectively. In addition, asignificant orientation by background interaction was discovered. We conclude that background local depth cues are integratedwith our target stimuli to contribute to depth perception.

Key words: depth perception, figure-background relationship, stereoacuity, Vernier visual acuity, visual psychophysics.

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