By Brian C. J. Moore
Because the first version was once released in 1998, massive advances were made within the fields of pitch belief and speech notion. furthermore, there were significant adjustments within the approach that listening to aids paintings, and the good points they give. This publication will offer an realizing of the alterations in conception that occur whilst someone has cochlear listening to loss so the reader knows not just what does occur, yet why it occurs. It interrelates physiological and perceptual info and offers either this and simple techniques in an built-in demeanour. The objective is to show an knowing of the perceptual alterations linked to cochlear listening to loss, of the problems confronted by way 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)
19. Input-output functions on the BM immediately preceding (solid lines) and following (broken lines) an intravenous furosemide injection. See text for details. Redrawn from Ruggero and Rich (1991). 19 were obtained at various times after injection of the drug; the time is indicated by a range in minutes next to each curve. Shortly after the injection (11–19 minutes), the input-output function for the CF tone was markedly altered. The biggest alteration was at low sound levels. To produce a given response on the BM (say, 40 m/s), the input level had to be increased by about 25 dB relative to the level measured before the injection.
This is described later on in this chapter. 4 TWO-TONE SUPPRESSION Experiments using two tones have revealed another aspect of nonlinearity on the BM, namely two-tone suppression. The effect is analogous to an effect that was first discovered from measurements of the responses of single neurones in the auditory nerve (see below for details). The response to a tone (called the ‘probe’ tone) with frequency close to the CF of the place on the BM being studied can be reduced by a second tone with a higher or lower frequency, especially when the second tone is higher in level than the probe tone (Rhode, 1977; Patuzzi, Sellick and Johnstone, 1984; Ruggero, Robles and Rich, 1992).
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.
Cochlear Hearing Loss: Physiological, Psychological and Technical Issues (Wiley Series in Human Communication Science) by Brian C. J. Moore