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European Archives of Oto-Rhino-Laryngology

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01-06-2018 | Otology

Cortical processing of speech in individuals with auditory neuropathy spectrum disorder

Authors: Kumari Apeksha, U. Ajith Kumar

Published in: European Archives of Oto-Rhino-Laryngology | Issue 6/2018

Abstract

Objective

Auditory neuropathy spectrum disorder (ANSD) is a condition where cochlear amplification function (involving outer hair cells) is normal but neural conduction in the auditory pathway is disordered. This study was done to investigate the cortical representation of speech in individuals with ANSD and to compare it with the individuals with normal hearing.

Design

Forty-five participants including 21 individuals with ANSD and 24 individuals with normal hearing were considered for the study. Individuals with ANSD had hearing thresholds ranging from normal hearing to moderate hearing loss. Auditory cortical evoked potentials—through odd ball paradigm—were recorded using 64 electrodes placed on the scalp for /ba/-/da/ stimulus. Onset cortical responses were also recorded in repetitive paradigm using /da/ stimuli. Sensitivity and reaction time required to identify the oddball stimuli were also obtained.

Result

Behavioural results indicated that individuals in ANSD group had significantly lower sensitivity and longer reaction times compared to individuals with normal hearing sensitivity. Reliable P300 could be elicited in both the groups. However, a significant difference in scalp topographies was observed between the two groups in both repetitive and oddball paradigms. Source localization using local auto regressive analyses revealed that activations were more diffuses in individuals with ANSD when compared to individuals with normal hearing sensitivity.

Conclusion

Results indicated that the brain networks and regions activated in individuals with ANSD during detection and discrimination of speech sounds are different from normal hearing individuals. In general, normal hearing individuals showed more focused activations while in individuals with ANSD activations were diffused.

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Title: Cortical processing of speech in individuals with auditory neuropathy spectrum disorder
Authors: Kumari Apeksha
U. Ajith Kumar
Publication date: 01-06-2018
Publisher: Springer Berlin Heidelberg
Published in: European Archives of Oto-Rhino-Laryngology / Issue 6/2018
Print ISSN: 0937-4477
Electronic ISSN: 1434-4726
DOI: https://doi.org/10.1007/s00405-018-4966-8

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Cortical processing of speech in individuals with auditory neuropathy spectrum disorder

Abstract

Objective

Design

Result

Conclusion

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Objective

Design

Result

Conclusion

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