Prosthetic devices for the management of patients with severe sensorineural deafness
AuthorClark, Graeme M.; Tong, Y. C.; Williams, A.
Source TitleJournal of the Otolaryngological Society of Australia
University of Melbourne Author/sClark, Graeme
Document TypeJournal Article
CitationsClark, G. M., Tong, Y. C., & Williams, A. (1977). Prosthetic devices for the management of patients with severe sensorineural deafness. Journal of the Otolaryngological Society of Australia, 4(2), 105-107.
Access StatusOpen Access
This is a publisher’s version of an article published in the Journal of the Otolaryngological Society of Australia 1973. This version is reproduced with permission from the Otolaryngological Society of Australia.
It is estimated that 5-10% of patients with significant hearing loss do not get satisfactory help with a hearing aid. This means that in Australia there are about 5,000-10,000 people who need further treatment. Furthermore, a large number of these patients are born deaf and their proper management is critical if they are going to develop adequate speech and language. If these patients are going 10 perceive speech, the speech must be broken down into signals that can be used 10 stimulate the residual hearing, excite the auditory nerve fibres by electrical stimulation or stimulate another sensory system such as vision or the skin senses. These alternatives offer real hope for the patient with severe sensori-neural deafness as there is a great deal of redundancy in the speech signal. This is illustrated in Fig. 1 which shows the raw signal obtained on a cathode ray oscilloscope for the word "ear". It can be seen that there is an overall waveform envelope which is now thought to be quite important in speech perception. Inside the speech waveform there are waves of many shapes and sizes. Far too many for your eye to detect at a glance, and indeed too many for your ear to perceive. In fact, when you hear phonemes and words your brain only picks up key signals.
Keywordsdeafness; otolaryngology; otology
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