Speech-evoked auditory brainstem response; electrophysiological evidence of upper brainstem facilitative role on sound l
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ORIGINAL ARTICLE
Speech-evoked auditory brainstem response; electrophysiological evidence of upper brainstem facilitative role on sound lateralization in noise Abdollah Moossavi 1 & Yones Lotfi 2
&
Mohanna Javanbakht 2
&
Soghrat Faghihzadeh 3
Received: 24 September 2018 / Accepted: 4 October 2019 # Fondazione Società Italiana di Neurologia 2019
Abstract Background and aim Sound lateralization/localization is one of the most important auditory processing abilities, which plays approved role in auditory streaming and speech perception in challenging situations like noisy places. In addition to the main role of lower brainstem centers like superior olivary complex in sound lateralization, efferent auditory system effects on improving auditory skills in everyday auditory challenging positions were revealed. This study evaluated noise effects on lateralization scores in correlation with an objective electrophysiologic test (Speech-ABR in noise), which objectively shows cumulative effects of the afferent and efferent auditory systems at the inferior colliculus and upper brainstem pathway. Method Fourteen normal-hearing subjects in the age range of 18 to 25 participated in this study. Lateralization scores in the quiet and noisy modes were evaluated. Speech-ABR in both ears for quiet mode and three different contralateral noise levels (SNR = + 5, 0, − 5) were recorded, too. Correlation of lateralization scores and Speech-ABR changes in noise was studied. Results Significant decrease of lateralization scores with latency increase and amplitude decrease of Speech-ABR transient peaks (V, A, O) was seen with noise presentation. A high positive correlation between lateralization decrease with latency increase of onset peaks (V, A) and amplitude decrease of transient peaks (V, A, O) was found in low signal-tonoise ratios. Conclusion The study revealed that in high challenging auditory situations like auditory lateralization in noise, upper brainstem centers and pathways play a facilitative role for main auditory lateralization centers in lower levels. Keywords Sound lateralization . Speech-evoked auditory brainstem response . Noise . Auditory efferent system
* Mohanna Javanbakht [email protected] Abdollah Moossavi [email protected] Yones Lotfi [email protected] Soghrat Faghihzadeh [email protected] 1
Department of Otolaryngology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
2
Department of Audiology, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
3
Department of Biostatistics and Epidemiology, Zanjan University of Medical Sciences, Zanjan, Iran
Introduction Auditory lateralization is one of the most important auditory ability. Lateralization of sound sources in the horizontal plane is based on binaural auditory processing of difference in time and intensity of received sounds to two ears [1]. Binaural auditory processing starts from caudal parts of the auditory brainstem and continues to auditory cortex level [2]. The important role of auditory later
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