Cochlear Hearing Loss: Physiological, Psychological and by Brian C. J. Moore
By Brian C. J. Moore
Because the first version used to be released in 1998, massive advances were made within the fields of pitch belief and speech conception. moreover, there were significant adjustments within the means that listening to aids paintings, and the gains they provide. This booklet will supply an knowing of the adjustments in belief that ensue whilst somebody has cochlear listening to loss so the reader is familiar with not just what does take place, yet why it occurs. It interrelates physiological and perceptual facts and provides either this and simple techniques in an built-in demeanour. The aim is to show an figuring out of the perceptual alterations linked to cochlear listening to loss, of the problems confronted through the hearing-impaired individual, and the constraints of present listening to aids.
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Extra info for Cochlear Hearing Loss: Physiological, Psychological and Technical Issues (Wiley Series in Human Communication Science)
Along with this has come an PHYSIOLOGICAL ASPECTS OF COCHLEAR HEARING LOSS 29 improved understanding of the changes in function that are associated with cochlear hearing loss. The rest of this chapter reviews the structure and function of the impaired cochlea. VII PHYSIOLOGY OF THE DAMAGED COCHLEA There is strong evidence that the functioning of the normal cochlea depends upon the operation of an active mechanism that is linked to the integrity of the OHCs. This mechanism may involve feedback of energy onto the BM, via the OHCs, and it plays an important role in producing the high sensitivity of the BM to weak sounds and the sharp tuning on the BM.
However, it is useful to have a way of describing the overall severity of a hearing loss. A common way of quantifying hearing loss is in terms of the absolute threshold for sinusoids, expressed in dB HL, and averaged over the frequencies 500, 1000 and 2000 Hz; this is often known as the pure-tone average (PTA) hearing loss. Goodman (1965) proposed the following classification: PTA −10–26 dB PTA 27–40 dB PTA 41–55 dB PTA 56–70 dB PTA 71–90 dB PTA over 90 dB Normal limits Mild hearing loss Moderate hearing loss Moderately severe hearing loss Severe hearing loss Profound hearing loss A similar classification is still used, although nowadays the boundary between normal hearing and mild hearing loss is usually put at a PTA of 16 dB.
The stimulating frequency, in kHz, is indicated by a number close to each curve. The dashed line indicates the slope that would be obtained if the responses were linear (velocity directly proportional to sound pressure). Redrawn from Robles, Ruggero and Rich (1986). At very low sound levels, below 20–30 dB, the amplification is roughly constant and is at its maximal value. As the sound level increases, the amplification progressively reduces. Thus, the response grows more slowly than it would in a linear system.