Abstract
Efferent modulation has been demonstrated to be very important for speech perception, especially in the presence of noise. We examined the functional relationship between two efferent systems: the rostral and caudal efferent pathways and their individual influences on speech perception in noise. Earlier studies have shown that these two efferent mechanisms were correlated with speech perception in noise. However, previously, these mechanisms were studied in isolation, and their functional relationship with each other was not investigated. We used a correlational design to study the relationship if any, between these two mechanisms in young and old normal hearing individuals. We recorded context-dependent brainstem encoding as an index of rostral efferent function and contralateral suppression of otoacoustic emissions as an index of caudal efferent function in groups with good and poor speech perception in noise. These efferent mechanisms were analysed for their relationship with each other and with speech perception in noise. We found that the two efferent mechanisms did not show any functional relationship. Interestingly, both the efferent mechanisms correlated with speech perception in noise and they even emerged as significant predictors. Based on the data, we posit that the two efferent mechanisms function relatively independently but with a common goal of fine-tuning the afferent input and refining auditory perception in degraded listening conditions.
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Authors 1 and 2 were involved in the conceptualization, data analysis and manuscript preparation. Author 3 was involved in stimuli and paradigm preparation, data collection, data analysis and manuscript preparation.
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All India Institute of Speech and Hearing Research Fund (ARF4.07, 2011-12 ).
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Glossary
- dB pkSPL
-
Decibel peak sound pressure level
- dB
-
Decibel
- MOC
-
Medial olivocohlear pathway
- ms
-
Millisecond
- μV
-
Microvolts
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Maruthy, S., Kumar, U.A. & Gnanateja, G.N. Functional Interplay Between the Putative Measures of Rostral and Caudal Efferent Regulation of Speech Perception in Noise. JARO 18, 635–648 (2017). https://doi.org/10.1007/s10162-017-0623-y
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DOI: https://doi.org/10.1007/s10162-017-0623-y