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Recent development of haptic technology has made possible the physical interaction with virtual environments. The combination of sight, hearing and touch senses provides these virtual environments with enhanced realism perception and interactivity to simulate multiple real world tasks. Furthermore, the addition of the sense of touch can help in the design of specific virtual tasks for people with visual impairment. This paper analyses the advantages and drawbacks of combining tactile and sound stimuli to render virtual environments for blind people. Specifically, it studies the combination of both senses to provide navigation-related information in virtual tasks. A user study has been carried out among several subjects in order to discuss this issue. Results state that a combination of both senses provides better performance in navigation tasks than with only haptic feedback.
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