By Brian C. J. Moore
Because the first variation used to be released in 1998, substantial advances were made within the fields of pitch belief and speech belief. additionally, there were significant alterations within the method that listening to aids paintings, and the gains they provide. This ebook will offer an figuring out of the alterations in conception that happen whilst anyone has cochlear listening to loss so the reader is aware not just what does occur, yet why it occurs. It interrelates physiological and perceptual facts and offers either this and easy suggestions in an built-in demeanour. The target is to exhibit an figuring out of the perceptual alterations linked to cochlear listening to loss, of the problems confronted by means of the hearing-impaired individual, and the restrictions of present listening to aids.
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Extra resources for Cochlear Hearing Loss: Physiological, Psychological and Technical Issues (Wiley Series in Human Communication Science)
However, individuals with similar absolute thresholds may vary considerably in this respect. IV CAUSES OF HEARING LOSS DUE TO COCHLEAR DAMAGE Elevation of absolute threshold due to cochlear damage can occur in two main ways. First, loss of function of the outer hair cells (OHCs) impairs the active mechanism, resulting in reduced BM vibration for a given low sound level. Hence, the sound level must be larger than normal to give a just-detectable amount of vibration. It is likely that hearing loss caused solely by loss of the active mechanism cannot be greater than about 50 dB at low frequencies and 60 dB at high frequencies.
Responses to tones with frequencies well away from the CF are linear, and remain so when the active mechanism is damaged. 2 NEURAL RESPONSES Some of the first evidence for a physiologically vulnerable active mechanism came from studies of the responses of single neurones in the auditory nerve. Robertson and Manley (1974) showed that the normal, sharp tuning seen in auditory neurones could be altered by reducing the oxygen supply to the animal. The tuning curves 32 COCHLEAR HEARING LOSS became less sharp, and at the same time the sensitivity around the tip decreased.
The one with frequency 2f1 − f2 is especially easy to hear. 2 times f1 (Smoorenburg, 1972a, 1972b). For example, if the two primary tones have frequencies 1000 and 1200 Hz, then a tone is heard with frequency 800 Hz. The combination tone with frequency 2f1 + f2 is much harder to hear. This may be the case because this tone has a higher frequency than the two primary tones. Although 2f1 + f2 is probably generated at the point where the response patterns of f1 and f2 overlap, it does not propagate to the location on the BM tuned to 2f1 + f2 ; this would involve propagation in the ‘wrong’ direction, from the apex towards the base.