Spivak L G, Seitz M R
NYU Medical Center, New York.
Ear Hear. 1988 Apr;9(2):57-64. doi: 10.1097/00003446-198804000-00002.
Asymmetry in the auditory brain stem evoked response (ABR) and its effect on measurements of binaural interaction were studied. Monaural and binaural ABRs were recorded from 24 normal hearing subjects at two sensation levels: 70 and 50 dB. Monaural responses were judged to be asymmetrical when the right response minus the left response resulted in a difference trace which was significantly greater than the level of the background noise in the ABR. It was found that sensation level significantly affected the frequency of monaural response asymmetry and that the amplitude of the derived binaural interaction component (BIC) was positively correlated with the degree of asymmetry present. Offsetting the asymmetry by introducing an interaural intensity difference resulted in a significant reduction in the amplitude of the BIC. It was concluded that the BIC is affected by factors other than those which can be attributed solely to binaural interaction.
研究了听性脑干反应（ABR）中的不对称性及其对双耳相互作用测量的影响。在70分贝和50分贝这两个感觉水平下，对24名听力正常的受试者记录了单耳和双耳ABR。当右耳反应减去左耳反应得出的差异轨迹明显大于ABR中的背景噪声水平时，单耳反应被判定为不对称。研究发现，感觉水平显著影响单耳反应不对称的频率，并且所推导的双耳相互作用成分（BIC）的幅度与存在的不对称程度呈正相关。通过引入耳间强度差异来抵消不对称性，会导致BIC幅度显著降低。得出的结论是，BIC受到并非仅可归因于双耳相互作用的因素的影响。
