Orlando M S, Folsom R C
University of Rochester Medical Center, New York, USA.
Ear Hear. 1995 Jun;16(3):311-20. doi: 10.1097/00003446-199506000-00008.
This study was conducted to investigate morphologic differences in the ABR as a result of reversing the stimulus polarity of frequency-limited single-cycle stimuli in normal-hearing subjects. The results clearly demonstrate that large latency differences occur between condensation and rarefaction stimuli for low-frequency stimuli. It is believed that polarity-specific latencies are a result of the highly phase-sensitive neural elements tuned to low-frequency stimuli. In the majority of test subjects the rarefaction stimulus produced shorter absolute wave latencies; however, in a small number of subjects, significantly shorter latencies were elicited with the condensation stimulus. It is believed that differences may occur from varying summation patterns of inner hair cell depolarization between subjects which would be consistent over time within the same subject.
本研究旨在调查正常听力受试者中，由于频率受限的单周期刺激的刺激极性反转而导致的听性脑干反应（ABR）的形态学差异。结果清楚地表明，低频刺激的压缩刺激和稀疏刺激之间存在较大的潜伏期差异。据信，极性特异性潜伏期是由于高度相位敏感的神经元元件被调谐到低频刺激的结果。在大多数测试受试者中，稀疏刺激产生的绝对波潜伏期较短；然而，在少数受试者中，压缩刺激引发的潜伏期明显更短。据信，受试者之间内毛细胞去极化的总和模式不同可能会导致差异，并且在同一受试者内这种差异会随时间保持一致。
