Suzuki T, Hirabayashi M
Department of Otolaryngology, Shinshu University School of Medicine, Matsumoto, Japan.
Audiology. 1987;26(5):312-20. doi: 10.3109/00206098709081558.
Age-related changes in the waveforms of the middle latency response (MLR) were investigated in 9 adults and 28 children aged between 4 and 14 years. The children were classified into three groups according to their age. For obtaining characteristic configurations in the responses for each group, composite group averaging was performed by summating the individual recordings in each group. With high-pass digital filtering at 20 Hz, composite MLR for adults showed a well-defined Na-Pa-Nb-Pb complex with peak latencies at about 17, 30, 45 and 63 ms, respectively. The composite response for children aged 4-7 years was characterized by a broad positive deflection (Pa) followed by a negative peak (Nb) at about 40 and 60 ms after stimulus onset, respectively. The peak latency of Pa was close to the adult value in the composite MLR for subjects aged 8-11 years, while the complete adult pattern in the later part of the response was not reached even in the composite response for subjects aged 12-14 years.
对9名成年人以及28名4至14岁儿童的中潜伏期反应（MLR）波形的年龄相关变化进行了研究。根据年龄，这些儿童被分为三组。为了获得每组反应的特征构型，通过将每组中的个体记录相加来进行复合组平均。在20赫兹进行高通数字滤波后，成年人的复合MLR显示出一个明确的Na-Pa-Nb-Pb复合波，其峰值潜伏期分别约为17、30、45和63毫秒。4至7岁儿童的复合反应特征是在刺激开始后约40和60毫秒分别出现一个宽的正波偏转（Pa），随后是一个负峰（Nb）。在8至11岁受试者的复合MLR中，Pa的峰值潜伏期接近成人值，而即使在12至14岁受试者的复合反应中，反应后期也未达到完整的成人模式。
