الفهرس 
Neural Encoding of SpeechOnly 14 pages are availabe for public view
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Abstract
Understanding speech in noise is one of the most complex activities encountered in everyday life, it is an important task for successful participation in educational and social environments. To the extreme end of poor speech perception lies the auditory neuropathy spectrum, where the signal from the inner hair cells or the neural connections from them are compromised. Perceptual abnormalities seen in people with auditory neuropathy include severe temporal processing impairments and extremely impaired Frequency discrimination abilities leading to severe difficulty with speech in background noise. The c-ABR is well suited for assessing hearing loss effects on neural processing of speech. Its fidelity to the stimulus can be seen in representation of timing features (onsets, offsets), pitch (encoding of the fundamental frequency (F0) of the stimulus), and timbre (representation of formants) through cycle-by-cycle neural phase-locking. To explore the effect of hearing loss (both cochlear & auditory neuropathy spectrum) on neural encoding of speech by measuring p1 and speech ABR. To study the relationship between speech ABR and the behavioural word recognition test (WRT) both in quiet and in noise. One of the most common complaints of people with cochlear hearing loss concerns difficulty with speech communication especially in noisy environments. Successful perception of speech in noise is dependent on cognitive factors as well as sound processing at peripheral, subcortical and cortical level. This study was conducted on a total number of (78) subjects. All tests were done in Audiology clinics at El-Demerdash hospital, Department of Otolaryngology, Ain Shams University. The most significant difference between SNHL and NH children was the amount of noise degradation of TFS (F1) magnitude and the Stimulus-to-Response correlation (S-R r), both indicates a deficient neural phase-locking ability in challenging listening conditions in hearing impaired children. Both The degradation of phase-locking and spectral encoding of (TFS) coupled with the temporal disruption of onset & offset provides neural evidence for the finding that SNHL children have greater difficulty in noisy situations than their NH peers.
Keywords: Hearing Loss, word recognition test, SNHL
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