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Published on: May 10, 2019
Efferent auditory system: its effect on auditory processing.
Fernanda Acaui Ribeiro Burguetti1, Renata Mota Mamede Carvallo2
1Doctoral degree, researcher in the Laboratório de Investigação Fonoaudiológica em Audição Humana da FMUSP.
Children with auditory processing disorders showed altered efferent auditory system function. Otoacoustic emission suppression was lower, and acoustic reflex sensitization was higher in these children compared to controls.
Area of Science:
- Auditory Neuroscience
- Neuroscience
- Speech and Hearing Sciences
Background:
- Auditory processing relies on the integrity of both afferent and efferent auditory pathways.
- The efferent auditory system, crucial for auditory processing, can be objectively assessed using non-invasive methods like acoustic reflex and otoacoustic emissions suppression.
Purpose of the Study:
- To analyze efferent auditory system activity in children with auditory processing disorders.
- To evaluate otoacoustic emission suppression and acoustic reflex sensitization in subjects with and without auditory processing disorders.
Main Methods:
- A prospective study involving 50 children with auditory processing disorders and 38 controls.
- Assessment included otoacoustic emissions with and without contralateral noise.
- Acoustic reflex testing with and without contralateral facilitating stimuli was performed.
Main Results:
- The study group exhibited lower mean otoacoustic emission suppression values (≤1.26 dB) compared to the control group (≤1.50 dB).
- The study group showed higher mean acoustic reflex sensitization values (≤14.60 dB) than the control group (≤15.21 dB).
- No statistically significant differences were found between the groups for either procedure.
Conclusions:
- Children with auditory processing disorders demonstrated distinct patterns in efferent auditory system function.
- Lower otoacoustic emission suppression and higher acoustic reflex sensitization were observed in the study group.
- These findings suggest potential differences in efferent pathway function in children with auditory processing disorders.
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