this volume), the translation to space is readily accepted by users, and the frequency of vibration can be kept at the value of maximum dynamic range of the system. A number of researchers feel that better representation by the aid of other dimensions of speech, for example, voicing, voice onset time, manner, place, and so on, will produce improved performance by users.
In general, the problem in designing a better tactual speech aid, as well as a better cochlear implant, lies in part in clarification of the models of hearing and speech perception. It was mentioned previously that speech perception by deaf persons and mobility of blind persons have some analogous characteristics. Perhaps the lack of a complete description of the processes involved in these two complex perceptual-motor skills remains the impediment to further refinement of the technology for rehabilitation.
Apkarian-Stielau P., & Loomis J. M. ( 1975). "A comparison of tactile and blurred visual form perception". Perception & Psychophysics, 18, 362-368.
Bach-y-Rita P., Collins C. C., Saunders F., White B., & Scadden L. ( 1969). "Vision substitution by tactile image projection". Nature, 221, 963-964.
Békésy G., von ( 1960). Experiments in hearing. New York: McGraw-Hill.
Békésy G., von ( 1967). Sensory inhibition. Princeton, NJ: Princeton University Press.
Békésy G., von ( 1971). "Auditory backward inhibition in concert halls". Science, 171, 529-536.
Blasch B. B., & Welsh R. L. ( 1980). "Training for persons with functional mobility limitations". In R. L. Welsh & B. B. Blasch (Eds.), Foundations of orientation and mobility. New York: American Foundation for the Blind, pp. 461-476.
Bracewell R. N. ( 1978), The Fourier transform and its applications. New York: McGraw-Hill.
Cholewiak R. W., & Sherrick C. E. ( 1981). "A computer-controlled matrix system for presentation to the skin of complex spatiotemporal patterns". Behavioral Research Methods and Instrumentation, 13, 667-673.