Selective attention to sound location or pitch studied with event-related brain potentials and magnetic fields
Selective attention to sound location or pitch studied with event-related brain potentials and magnetic fields
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DOI：
10.1111/j.1460-9568.2008.06286.x
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发表时间：
2008-06-01
影响因子：
3.4
通讯作者：
Alho, Kimmo
中科院分区：
文献类型：
--
作者：
Degerman, Alexander;Rinne, Teemu;Alho, Kimmo
事件相关脑电位（ERPs）和磁场（ERF）被用来比较与人类对声音位置或音高的选择性注意相关的大脑活动。16名健康成年人参加了ERP实验，11名成年人参加了ERF实验。在不同的条件下，参与者将注意力集中在指定的声音位置或音高上，或者屏幕上呈现的图片上，以便在所关注的刺激中检测目标声音或图片。在关注位置条件下，声音的位置随机变化（左或右），而它们的音高（高或低）保持不变。在注意音高条件下，不同音高（高或低）的声音呈现在恒定位置（左或右）。与以前的ERP结果一致，选择性注意任何声音功能产生了负差异（Nd）的ERP出席和无人值守的声音。此外，ERPs显示位置相关的Nd比音高相关的Nd更后头皮分布，这表明这些Nd的部分不同的发电机。ERF源分析发现，在上级颞叶皮层（STC）中，与音高相关的Ndm（Nd的磁性对应物）和与位置相关的Ndm之间没有源分布差异，Ndm效应的主要源被认为位于STC中。因此，ERP头皮分布之间的位置相关和音高相关的Nd效应的差异可能是由STC以外的地区，也许在下顶叶区域的活动。
Event-related brain potentials (ERPs) and magnetic fields (ERFs) were used to compare brain activity associated with selective attention to sound location or pitch in humans. Sixteen healthy adults participated in the ERP experiment, and 11 adults in the ERF experiment. In different conditions, the participants focused their attention on a designated sound location or pitch, or pictures presented on a screen, in order to detect target sounds or pictures among the attended stimuli. In the Attend Location condition, the location of sounds varied randomly (left or right), while their pitch (high or low) was kept constant. In the Attend Pitch condition, sounds of varying pitch (high or low) were presented at a constant location (left or right). Consistent with previous ERP results, selective attention to either sound feature produced a negative difference (Nd) between ERPs to attended and unattended sounds. In addition, ERPs showed a more posterior scalp distribution for the location-related Nd than for the pitch-related Nd, suggesting partially different generators for these Nds. The ERF source analyses found no source distribution differences between the pitch-related Ndm (the magnetic counterpart of the Nd) and location-related Ndm in the superior temporal cortex (STC), where the main sources of the Ndm effects are thought to be located. Thus, the ERP scalp distribution differences between the location-related and pitch-related Nd effects may have been caused by activity of areas outside the STC, perhaps in the inferior parietal regions.