By Brian C.J. Moore(auth.)
ISBN-10: 047051633X
ISBN-13: 9780470516331
ISBN-10: 047098788X
ISBN-13: 9780470987889
Because the first variation was once released in 1998, massive advances were made within the fields of pitch conception and speech belief. moreover, there were significant adjustments within the approach that listening to aids paintings, and the gains they provide. This publication will offer an realizing of the alterations in notion that occur whilst anyone has cochlear listening to loss so the reader is familiar with not just what does occur, yet why it occurs. It interrelates physiological and perceptual info and provides either this and simple innovations in an built-in demeanour. The aim is to express an knowing of the perceptual adjustments linked to cochlear listening to loss, of the problems confronted through the hearing-impaired individual, and the constraints of present listening to aids.Content:
Chapter 1 Physiological features of Cochlear listening to Loss (pages 1–37):
Chapter 2 Absolute Thresholds (pages 39–44):
Chapter three overlaying, Frequency Selectivity and Basilar Membrane Nonlinearity (pages 45–91):
Chapter four Loudness belief and depth solution (pages 93–115):
Chapter five Temporal solution and Temporal Integration (pages 117–141):
Chapter 6 Pitch belief and Frequency Discrimination (pages 143–172):
Chapter 7 Spatial listening to and merits of Binaural listening to (pages 173–199):
Chapter eight Speech conception (pages 201–232):
Chapter nine listening to Aids (pages 233–268):
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Additional info for Cochlear Hearing Loss: Physiological, Psychological and Technical Issues, Second Edition
Example text
Kemp suggested that the reflections are generated at points on the BM, or in the IHC/OHC transduction mechanism, where there is a gradient or discontinuity in the mechanical or electrical properties. The response is nonlinear, in that the reflected sound does not have an intensity in direct proportion to the input intensity. In fact, the relative level of the reflection is greatest at low sound levels; the emission grows about 3 dB for each 10 dB increase in input level. This nonlinear behaviour can be used to distinguish the response arising from the cochlea from the linear middle ear response.
The curve shows a compressive nonlinearity for input sound levels between about 30 and 90 dB SPL. In contrast, the response to a sinusoid with a frequency of 1000 Hz, well below the CF, is steeper and is almost linear (solid curve with open circles). To manipulate the functioning of the cochlea, the animal was injected with furosemide (also known as frusemide), a diuretic that is known to disrupt hair cell potentials, and hence disrupt the function of the hair cells. 18. Examples of patterns of damage to the OHCs.
6 RESPONSES OF THE BASILAR MEMBRANE TO COMPLEX SOUNDS Consider the response of the BM to two sinusoids, of different frequencies, presented simultaneously. Assume that the sinusoids are equal in level, so that two-tone suppression is small. The kind of pattern of vibration that occurs depends on the frequency separation of the two sinusoids. If this is very large, then the two sinusoids produce two, effectively separate, patterns of vibration on the BM. Each produces a maximum at the place on the BM which would have been excited most had that component been presented alone.
Cochlear Hearing Loss: Physiological, Psychological and Technical Issues, Second Edition by Brian C.J. Moore(auth.)
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