Adaptation of egocentric distance perception under telestereoscopic viewing within reaching space.Report as inadecuate




Adaptation of egocentric distance perception under telestereoscopic viewing within reaching space. - Download this document for free, or read online. Document in PDF available to download.

* Corresponding author 1 IRBA - Institut de recherche biomédicale des armées 2 Espace et action 3 MAX PLANCK INSTITUTE - Max Planck Institute for Human Cognitive and Brain Sciences Department of Psychology

Abstract : Telestereoscopic viewing provides a method to distort egocentric distance perception by artificially increasing the interpupillary distance. Adaptation to such a visual rearrangement is little understood. Two experiments were performed in order to dissociate the effects of a sustained increased vergence demand, from those of an active calibration of the vergence-distance mapping. Egocentric distances were assessed within reaching space through open-loop pointing to small targets in the dark. During the exposure condition of the first experiment, subjects were instructed to point to the targets without feedback, whereas in the second experiment, hand visual feedback was available, resulting in a modified relationship between vergence-specified distance and reach distance. The visual component of adaptation in the second experiment was assessed on the unexposed hand. In the post-tests of both experiments, subjects exhibited a constant distance overestimation across all targets, with a more than twice larger aftereffect in the second one. These findings suggest two different processes: 1 an alteration in the vergence effort following sustained increased vergence; 2 a calibration of the vergence-distance mapping uncovering the visual component of adaptation.

Keywords : Adaptation Vergence Binocular Reaching space Egocentric distance perception





Author: Anne-Emmanuelle Priot - Rafael Laboissière - Olivier Sillan - Corinne Roumes - Claude Prablanc -

Source: https://hal.archives-ouvertes.fr/



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