Auditory Middle Latency Responses: a study of healthy children.
OBJECTIVE
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.


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.


CONCLUSIONS
This study provides additional information about AMLRs and may be a reference for others clinical and experimental studies in children.
Figueiredo Frizzo
Ana Claudia
AC
Ribeirao Preto Medical School, USP.
Rodrigues Funayama
Carolina Araújo
CA
Isaac
Myriam Lima
ML
Colafêmina
José Fernando
JF
D000293:Adolescent; D002648:Child; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D011930:Reaction Time / Q000502:physiology*; D012016:Reference Values