Interstimulus interval and the selective-attention effect on auditory ERPs: "N1 enhancement" versus processing negativity.
Interstimulus interval and the selective-attention effect on auditory ERPs: "N1 enhancement" versus processing negativity.
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刺激间间隔和选择性注意对听觉 ERP 的影响：“N1 增强”与处理消极性。
DOI：
10.1111/j.1469-8986.1993.tb03206.x
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发表时间：
2007
期刊：
影响因子：
3.7
通讯作者：
Risto Näätänen
中科院分区：
文献类型：
--
作者：
W. Teder;K. Alho;K. Reinikainen;Risto Näätänen
研究了听觉事件相关电位（ERP）在二元状态下的注意效应与刺激间期（ISI）的关系。受试者注意到传递到指定耳朵的刺激，并对该输入中不常见的音高偏差做出反应。平均ISI为80、160、480或800毫秒。负差波（Nds）是通过从相同刺激的erp中减去无人参与标准的erp来计算的。根据无人参与的标准erp估计，外源性N1在刺激的对侧较大，并且在乳突处极性倒置。随着ISIs的减小，N1的振幅比Nd的减小要快得多。此外，N1潜伏期保持稳定，而Nd峰值明显更早，ISIs更短，几乎完全符合外源性N1。然而，在大平均值中发现的这种时间巧合在单个受试者中被证明是虚幻的。早期Nd峰值对侧不对称，但在上坡过程中不对称明显。这些侧位不对称与外源性N1相似，但发生较晚。早期的Nd峰值至少主要是由内源性注意效应，即加工负性（PN）引起的，即使ISIs很短，但也不能排除外源性N1的影响。
The attention effect on the auditory event-related potential (ERP) in dichotic conditions was studied as a function of the interstimulus interval (ISI). Subjects attended to stimuli delivered to a designated ear and responded to infrequent pitch deviants in this input. The mean ISI was either 80, 160, 480, or 800 ms. Negative difference waves (Nds) were computed by subtracting ERPs to unattended standards from ERPs to the same stimuli when attended. The exogenous N1, as estimated from unattended standard ERPs, was larger contralaterally to the stimulus and inverted in polarity at mastoids. With decreasing ISIs, N1 diminished in amplitude much faster than did the Nd. In addition, N1 latency remained stable, whereas Nd peaked markedly earlier with shorter ISIs, almost perfectly coinciding with the exogenous N1. However, this temporal coincidence found in grand averages proved to be illusory in single subjects. The early Nd showed no contralateral asymmetry at its peak, but asymmetry was apparent during the ascending slope. These lateral asymmetries resembled those of the exogenous N1 but occurred later. The early Nd peak was, at least mainly, caused by an endogenous attention effect, the processing negativity (PN), even with very short ISIs, but an effect on the exogenous N1 could not be excluded.