Davis H, Hirsh S K, Popelka G R, Formby C
Audiology. 1984;23(1):59-74. doi: 10.3109/00206098409072822.
Auditory evoked potentials are nearly all on-effects and the 'effective stimuli' for them are necessarily brief. Their frequency specificity is therefore limited, especially for the brainstem responses, because of the well-known trade-off between duration and frequency specificity. Brainstem responses are of special interest because they are unchanged in the sleep-like sedation that is required for difficult-to-test children. The middle-latency responses do not meet this requirement. Two patterns of tone burst that are appropriate and promising for the slow cortical potentials and for brainstem potentials, respectively, have rise and fall times of 2 periods of the modulated tone and plateaus of 10 (or 7) periods and 1 period, respectively. Their behavioral thresholds are nearly insensitive to difference in repetition rate between 4 and 40 stimuli/s. Their peak equivalent SPL threshold values at 500, 1 000, 2 000 and 4 000 Hz have been determined for 16 otologically normal ears. Using these reference levels, audiograms have been obtained for subjects with impaired hearing. The audiograms for 'flat' hearing losses do not differ significantly from the corresponding conventional pure-tone audiograms. The slopes for steep high-frequency hearing losses are underestimated, however, particularly with the brief (2-1-2) pattern. Nevertheless, the 2-1-2 pattern appears to be close to the best possible compromise.
听觉诱发电位几乎都是起始反应，其“有效刺激”必然是短暂的。因此，它们的频率特异性有限，尤其是对于脑干反应而言，这是由于持续时间和频率特异性之间众所周知的权衡关系。脑干反应特别受关注，因为在难以测试的儿童所需的类睡眠镇静状态下，它们不会发生变化。中潜伏期反应不满足这一要求。分别适用于慢皮层电位和脑干电位且很有前景的两种短音模式，其上升和下降时间分别为调制音的2个周期，平台期分别为10（或7）个周期和1个周期。它们的行为阈值对4至40次刺激/秒之间的重复率差异几乎不敏感。已针对16只听力正常的耳朵确定了它们在500、1000、2000和4000赫兹时的等效声压级峰值阈值。使用这些参考水平，已为听力受损的受试者获得了听力图。“平坦型”听力损失的听力图与相应的传统纯音听力图没有显著差异。然而，对于陡峭的高频听力损失，其斜率被低估了，尤其是使用短暂的（2 - 1 - 2）模式时。尽管如此，2 - 1 - 2模式似乎接近可能的最佳折衷方案。
