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. 2007 May-Jun;73(3):398-403.
doi: 10.1016/s1808-8694(15)30085-9.

Auditory Middle Latency Responses: a study of healthy children

Ana Claudia Figueiredo Frizzo  1 , Carolina Araújo Rodrigues Funayama, Myriam Lima Isaac, José Fernando Colafêmina
Affiliations

Auditory Middle Latency Responses: a study of healthy children

Ana Claudia Figueiredo Frizzo et al. Braz J Otorhinolaryngol. 2007 May-Jun.

Abstract

Aim: To examine the components of auditory middle latency responses (AMLRs) in a sample of healthy children to establish their properties.

Methods: Thirty-two children of both genders aged between 10 to 13 years, with no neurological disorders, were included in the study. Data were analyzed statistically by descriptive statistics (mean + SD) and by analysis of variance using the F test. AMLRs were investigated with toneburst stimuli at 50, 60 and 70 dB HL.

Results and conclusions: The mean latencies of the components were Na = 20.79 ms, Pa = 35.34 ms, Nb = 43.27 ms, and Pb = 53.36 ms, in 70 dB HL. The mean values for the NaPa amplitude ranged from 0.2 to 1.9 mV (M = 1.0 mV). The amplitude increased and latency decreased with increasing sound intensity. Inclination of the NaPa wave complex was present in some cases, which deserves attention in similar studies or in children with speech, language and auditory processing difficulties.

Conclusion: This study provides additional information about AMLRs and may be a reference for others clinical and experimental studies in children.

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Figures

Figure 1
Figure 1
AMLR recording at 70 dBNA with replication. Key: mV= microvolts; ms = milliseconds.
Figure 2
Figure 2
AMLR recording at 70dBNA in a 13-year-old child Key: mV= microvolts; ms = milliseconds.
See this image and copyright information in PMC

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