Woods D L, Alho K, Algazi A
Department of Neurology, University of California-Davis.
Psychophysiology. 1993 May;30(3):287-95. doi: 10.1111/j.1469-8986.1993.tb03355.x.
Auditory event-related brain potentials (ERPs) were recorded for 250- and 4,000-Hz tone bursts in an intermodal selective attention task. Tonotopic changes were evident in the scalp distribution of the rising phase of the auditory N1 (mean peak latency 116 ms); the N1 was more frontally distributed following the 4,000-Hz than following the 250-Hz tone bursts, and it included a contralateral P90 component that was absent following 250-Hz tones. ERPs related to intermodal selective attention were isolated as negative and positive auditory difference waves (Ndas and Pdas). Neither the Nda nor the Pda showed changes in distribution with tone frequency, but both showed Ear x Frequency changes in distribution. ERPs for deviant tones included mismatch negativities (MMNs) and, in attend auditory conditions, N2b and P3 components. These components did not change in scalp distribution with tone frequency. One possible explanation is that tonotopic displacements of ERP distributions on the scalp surface depend on angular displacements in generator fields on gyral convexities. The results are consistent with the possibility that auditory processing radiates outward with increasing latency from tonotopic fields on Heschl's gyri to more gyrus-free regions of the planun temporale and anterior superior temporal plane.
在一项多模态选择性注意任务中，记录了250赫兹和4000赫兹纯音脉冲的听觉事件相关脑电位（ERP）。听觉N1波上升期（平均峰潜伏期116毫秒）的头皮分布中存在音调定位变化；与250赫兹纯音脉冲相比，4000赫兹纯音脉冲后的N1波在额叶分布更多，且包含一个对侧P90成分，250赫兹纯音后该成分不存在。与多模态选择性注意相关的ERP被分离为负性和正性听觉差异波（Nda和Pda）。Nda和Pda的分布均未随音调频率发生变化，但二者均表现出耳×频率的分布变化。异常音调的ERP包括失匹配负波（MMN），以及在注意听觉条件下的N2b和P3成分。这些成分的头皮分布未随音调频率改变。一种可能的解释是，头皮表面ERP分布的音调定位位移取决于脑回凸面上发生器场的角位移。结果与以下可能性一致，即听觉处理从颞横回上的音调定位场开始，随着潜伏期增加向外辐射至颞平面和颞上回前部更多无脑回的区域。
