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Apport de la réalité virtuelle pour la coordination des référentiels spatiaux chez les aveugles : SeaTouch, un logiciel de navigation haptique et auditif pour la préparation d'itinéraire à la voile par les marins non-voyants.

Abstract : Though construction of spatial representations comes from physical contacts of human being with their environment, the use of euclidean geometry seems to facilitate mental processing about space. However, navigation takes great advantage of matching ego- and allo- centered spatial frames of reference to move and locate in surroundings. Blindness does not implicate a lack of comprehension of spatial concepts, but it leads to encounter difficulties in perceiving and updating information about environment. Without visual perceptions, blind people tend to encode spatial relations in an egocentered spatial frame of reference. On the contrary, tactile maps and appropriate exploration strategies allow them to build the representation of a configuration in an allocentered spatial frame of reference. However position updating during navigation remains particularly complicated without vision. Virtual reality techniques permit to manage surrounding sounds and haptic interfaces to provide blind people with immersive virtual navigations. In order to help blind sailors to coordinate ego- and allo- centered spatial frames of reference, we conceived SeaTouch. This haptic and auditory software is adapted to blind sailors to set up and simulate their itineraries before sailing navigation. In a first experimentation, we compare spatial representations built by six blind sailors during the exploration of a tactile map and the virtual map of SeaTouch. Results show that these two conditions were equivalent. In a second experimentation, we focused on the conditions which favor the transfer of spatial knowledge from virtual to real environment. In this respect, blind sailors performed a virtual navigation in Northing mode, where the ship moves on the map, and in Heading mode, where the map shifts around the sailboat. No significant difference appears. This reveals that the most important factor for the blind sailors to locate themselves in the real environment is the orientation of the maps during the initial encoding time. However, we noticed that the subjects who got lost in the virtual environment in northing condition slightly improve their performances in the real environment. The analysis of the exploratory movements on the map is congruent with a previous model of coordination of spatial frames of reference. Moreover than the straight benefits of SeaTouch for the navigation of blind sailors, this study offers some new elements to understand the non visual spatial condition and more specifically the coordination of ego and allocentered spatial frames of reference.
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https://tel.archives-ouvertes.fr/tel-00437301
Contributor : Mathieu Simonnet <>
Submitted on : Monday, November 30, 2009 - 11:41:50 AM
Last modification on : Friday, October 23, 2020 - 4:59:17 PM
Long-term archiving on: : Thursday, June 17, 2010 - 7:08:42 PM

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  • HAL Id : tel-00437301, version 1

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Mathieu Simonnet. Apport de la réalité virtuelle pour la coordination des référentiels spatiaux chez les aveugles : SeaTouch, un logiciel de navigation haptique et auditif pour la préparation d'itinéraire à la voile par les marins non-voyants.. Psychologie. Université de Bretagne occidentale - Brest, 2008. Français. ⟨tel-00437301⟩

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