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Year : 2015  |  Volume : 31  |  Issue : 3  |  Page : 156-161

Brainstem encoding of speech in normal-hearing individuals with absent acoustic reflex

1 Department of Audiology, Modern Speech and Hearing Centre, Raipur, Chhattisgarh, India
2 All India Institute of Speech and Hearing (AIISH), Mysore, Karnataka, India
3 Department of ENT, Audiology and Speech Language Pathology Unit, Pt. J. N. M, Medical College, Ayush Health Science University, Raipur, Chhattisgarh, India

Correspondence Address:
Himanshu Kumar Sanju
All India Institute of Speech and Hearing (AIISH), Mysore-6, Karnataka
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/1012-5574.161599

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The acoustic reflex test is an important tool for identifying auditory disorder from the middle ear to the superior olivary complex. Absence of acoustic reflexes is the early sign of many auditory disorders. Absence of acoustic reflex with normal hearing sensitivity may be an early sign of auditory neuropathy with poor encoding of speech at initial stage. Speech auditory brainstem response was recorded with /da/ (40 ms) stimuli in two groups of patients. The control group contained normal-hearing participants with presence of acoustic reflex, whereas the experimental group contained normal-hearing participants with absent acoustic reflexes. The peak latency, amplitude, and F0 and F1 mean amplitude were analyzed in both groups. MANOVA showed no significant difference in any parameter between the control and experimental group. Results of the current study showed that absence of acoustic reflexes in normal-hearing patients without auditory complaint is not sufficient by itself to diagnose the existence of auditory neuropathy. This study also highlighted that normal-hearing patients with absence of acoustic reflex have similar brainstem encoding of speech as that of patients with acoustic reflex.

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