Cochlear Hearing Loss: Physiological, Psychological and Technical Issues
Since the first edition was published in 1998, considerable advances have been made in the fields of pitch perception and speech perception. In addition, there have been major changes in the way that hearing aids work, and the features they offer. This book will provide an understanding of the changes in perception that take place when a person has cochlear hearing loss so the reader understands not only what does happen, but why it happens. It interrelates physiological and perceptual data and presents both this and basic concepts in an integrated manner. The goal is to convey an understanding of the perceptual changes associated with cochlear hearing loss, of the difficulties faced by the hearing-impaired person, and the limitations of current hearing aids.
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1 Physiological Aspects of Cochlear Hearing Loss
2 Absolute Thresholds
3 Masking Frequency Selectivity and Basilar Membrane Nonlinearity
4 Loudness Perception and Intensity Resolution
5 Temporal Resolution and Temporal Integration
6 Pitch Perception and Frequency Discrimination
absolute threshold active mechanism amplitude amplitude modulated audibility auditory filter auditory nerve auditory system automatic gain control band bandwidth basilar membrane binaural centre frequency changes Chapter cochlear damage cochlear hearing loss complex tone components cues dB SPL dead region decibels described discrimination effect envelope ERBN example excitation pattern forward masking gain hair cells harmonics hearing aids hearing-impaired subjects high frequencies high-frequency IHCs impaired ear increasing input level input-output function intensity listening loudness recruitment low frequencies low-frequency masker level measured MLDs modulation rate Moore and Glasberg neural neurones normally hearing subjects notched noise occur OHCs output panel peak perception phase locking pitch Plomp plotted presented psychoacoustical PTCs reduced frequency selectivity relative response shows signal frequency simulation sinusoid slope sound level spectral spectrum speech intelligibility stereocilia stimuli temporal fine structure temporal integrator temporal resolution threshold for detecting tuning curve waveform