Objective evaluation of spatial information acquisition using a visuo-tactile sensory substitution device

Authors:
Luca Brayda;Claudio Campus;Ryad Chellali;Guido Rodriguez
Affiliations:
Human Robots Mediated Interactions Lab., Telerobotics and Applications Dept., Italian Institute of Technology, Genova, Italy;Human Robots Mediated Interactions Lab., Telerobotics and Applications Dept., Italian Institute of Technology, Genova, Italy;Human Robots Mediated Interactions Lab., Telerobotics and Applications Dept., Italian Institute of Technology, Genova, Italy;Clinical Neurophysiology, Department of Neurosciences, Ophthalmology and Genetics, University of Genoa, Italy
Venue:
ICSR'10 Proceedings of the Second international conference on Social robotics
Year:
2010

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Abstract

This paper proposes a method to objectively assess the degree of sensory transfer in a visuo-tactile Sensory Substitution task. Using a special purpose single taxel-based device, users discover with tact some virtual objects of increasing geometrical complexity, while EEG signals are recorded. Successful reconstruction, as well as cognitive load and brain programming, are found to be associated with relative activation/deactivation of specific EEG bands, and to the users' exploration strategies, which allows us to objectively assess the perceived degree of complexity of the reconstruction task. Our metrics also provide an evaluation tool for the design of devices useful for the navigation of visually impaired people.