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文中观察了１０名健康飞行员在“计数”和“不计数”状态下３００ｍｓ的电位情况。采用新异的声刺激模式，小概率靶刺激信号为２ｋＨｚ短音（占２０％），大概率非靶刺激信号为１ｋＨ２短音（占８０％）。测试方式分为“计数”、“不计数”两种，分别测定靶与非靶刺激所诱发的３００ｍｓ处电位，并计算二者相减所得差异负波各参数。结果显示：“计数”状态下，比“不计数”状态下Ｐ３００的潜伏期为短，波幅为大，Ｐ３００反映了选择性注意时脑控制性加工过程。而“不计数”状态下的差异负波的基线上面积，虽较“计数”状态时为小，但仍清晰可辨。差异负波包括失匹配负电位（ＭＭＮ）和／或Ｎ２ａ，属外源性电位，反映了被动注意时脑自动加工过程。作者认为Ｐ３００及差异负波可分别作为“计数”与“不计数”测试指标，有可能客观而无创性地对中枢听觉脑认知功能作出评估，具有一定的临床应用价值。
In this paper, we observed the potential of 300 healthy males in “count” and “no count” states. Using a new acoustic stimulation mode, the small-rate target stimulus signal is 2kHz (20%), and the non-target stimulus signal is 1kH2 (80%). Test methods are divided into “count”, “no count” two, were measured target and non-target stimulation induced potential of 300ms, and calculate the subtraction of the two minus the difference between the various parameters. The results showed that P300 had a shorter incubation period and larger amplitude than the “no-count” state in “counting” state, and P300 reflected brain-controlled processing in selective attention. However, the baseline area of the negative and negative waves in the “no-count” state is smaller than the “count” state but is still clearly identifiable. Discrepant negatives, including mismatched negative potentials (MMNs) and / or N2a, are exogenous potentials and reflect the brain’s automatic processing during passive attention. The author thinks that P300 and negative-negative can be used as the index of “count” and “no-count” respectively. It is possible to evaluate central cognitive brain function objectively and noninvasively, which has certain clinical value.