Prevec T S, Ribarić K
Audiology. 1980;19(6):457-68. doi: 10.3109/00206098009070078.
In earlier reports we described contingent negative variation audiometry (CNV-A) and explored the accuracy of the method used in clinical conditions. Amplitude was found to be the factor which determines the accuracy of CNV-A. With this study we aimed to increase the amplitude of the CNV so as to improve the accuracy of CNV-A. The amplitude of the CNV is dependent on the content of the information of the S2 stimulus in the CNV paradigm. For this purpose we used a light stimulus (red or green) for the S2. The patient had to recognize the stimulus and act accordingly. The tests were performed on 12 volunteers in whom we simultaneously registered the CNV and the slow vertex response. The amplitude of the CNV was on average higher than with the previous CNV-A methods. The mean value of the absolute difference of the results between CNV-A and subjective tonal audiometry (ADG) was 6.9 +/- 5.5 dB. The mean difference between the results of both methods, however, was only 4.3 +/- 7.8 dB. The new CNV-A method is more accurate than the previous one. Nevertheless, we believe that not all possibilities for the improvement of the method have been explored. By taking into account the psychological factors which influence the amplitude of the CNV, and with a better computer analysis of the recordings, it will probably be possible to obtain even more accurate objective data on the threshold of perception of auditory stimuli with the aid of CNV-A.
在早期报告中，我们描述了关联负变化听力测定法（CNV-A），并探讨了该方法在临床条件下使用的准确性。发现振幅是决定CNV-A准确性的因素。通过这项研究，我们旨在增加CNV的振幅，以提高CNV-A的准确性。CNV的振幅取决于CNV范式中S2刺激的信息内容。为此，我们对S2使用了光刺激（红色或绿色）。患者必须识别该刺激并做出相应反应。对12名志愿者进行了测试，我们同时记录了他们的CNV和慢顶点反应。CNV的振幅平均高于之前的CNV-A方法。CNV-A与主观纯音听力测定法（ADG）结果的绝对差值平均值为6.9±5.5dB。然而，两种方法结果的平均差值仅为4.3±7.8dB。新的CNV-A方法比之前的更准确。尽管如此，我们认为尚未探索该方法所有的改进可能性。通过考虑影响CNV振幅的心理因素，并对记录进行更好的计算机分析，借助CNV-A可能获得关于听觉刺激感知阈值的更准确客观数据。
