What is it about?
Children with diagnosed auditory processing disorder were tested to see whether there were differences in the otoacoustic emissions (OAE strength and inhibition) and middle ear muscle acoustic reflex thresholds, compared to a control group. There were no OAE group differences between groups but acoustic reflex thresholds were significantly higher at 2000 Hz in the APD group for contralateral stimulation (sound presented to ear opposite the ear in which the muscle contraction was recorded). This is consistent with other studies showing acoustic reflex differences in children with APD.
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Why is it important?
This study is important as it highlights the need to measure acoustic reflexes in children with suspected APD. Also, the study does not provide support for the view that APD is associated with disordered auditory efferent function (to the extent that this can be measured using a contralateral inhibiition OAE paradigm).
Read the Original
This page is a summary of: Assessment of the efferent auditory system in children with suspected auditory processing disorder: the Middle ear muscle reflex and contralateral inhibition of OAEs, International Journal of Audiology, January 2019, Taylor & Francis, DOI: 10.1080/14992027.2018.1523578.
You can read the full text:
Assessment of the efferent auditory system in children with suspected auditory processing disorder: the Middle ear muscle reflex and contralateral inhibition of OAEs
Objective: To determine whether children aged 7 to 12 years with listening difficulties show objective evidence for efferent auditory function based on measurements of medial olivo-cochlear and middle ear muscle reflexes. Design: Click-evoked otoacoustic emissions recorded with and without contralateral broadband noise and ipsilateral and contralateral tonal (1000, 2000 Hz) middle ear muscle reflex thresholds were examined. Study sample: 29 children diagnosed with suspected auditory processing disorder (APD) and a control group of 34 typically developing children participated in this study. Results: Children with suspected APD had poorer performance on auditory processing tests than the control group. Middle ear muscle reflex thresholds were significantly higher at 2000 Hz in the suspected APD group for contralateral stimulation. MOC inhibition effects did not differ between APD and control groups. Conclusions: This research supports earlier studies showing altered acoustic reflexes in children with APD. No group differences were found for the MOC reflex measures, consistent with some earlier studies in children with APD.
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