Decrease of functional coupling between left and right auditory cortices during dichotic listening: An electroencephalography study
Decrease of functional coupling between left and right auditory cortices during dichotic listening: An electroencephalography study
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DOI：
10.1016/j.neuroscience.2005.06.046
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发表时间：
2005-01-01
期刊：
影响因子：
3.3
通讯作者：
Rossini, PM
中科院分区：
文献类型：
--
作者：
Brancucci, A;Babiloni, C;Rossini, PM
本研究的重点是人类双侧听觉皮层之间的功能耦合和可能的影响，在双耳分听复杂的非语言音调有近（竞争）与远距离非竞争的基本频率相比，左听觉皮层的权利。据推测，竞争音的双耳分听刺激会导致两个听觉皮层之间的功能耦合下降，如脑电图相干性降低和从右侧（专门用于本刺激材料）到左侧听觉皮层的定向传递功能增加所揭示的。脑电图记录从T3和T4头皮部位，分别覆盖左侧和右侧的听觉皮层，并从Cz头皮部位（顶点）的控制目的。事件相关的T3和T4头皮站点之间的连贯性显着降低所有感兴趣的脑电频段在双耳分听的竞争比非竞争的音调对。这是一个具体的效果，因为事件相关的连贯性没有不同的一元控制条件。此外，T3和Cz之间以及T4和Cz头皮部位之间的事件相关相干性未显示出显著影响。相反，有向传递函数的结果表明，在组水平的影响可以忽略不计的左右听觉皮层在双耳分听。这些结果表明，减少双边听觉皮层之间的功能耦合在竞争的双耳分听刺激作为一个可能的神经基板在双耳分听听觉刺激的偏侧化。(c)2005由Elsevier Ltd代表IBRO出版。
The present study focused on functional coupling between human bilateral auditory cortices and on possible influence of right over left auditory cortex during dichotic listening of complex non-verbal tones having near (competing) compared with distant non-competing fundamental frequencies. It was hypothesized that dichotic stimulation with competing tones would induce a decline of functional coupling between the two auditory cortices, as revealed by a decrease of electroencephalography coherence and an increase of directed transfer function from right (specialized for the present stimulus material) to left auditory cortex. Electroencephalograph was recorded from T3 and T4 scalp sites, overlying respectively left and right auditory cortices, and from Cz scalp site (vertex) for control purposes. Event-related coherence between T3 and T4 scalp sites was significantly lower for all electroencephalography bands of interest during dichotic listening of competing than non-competing tone pairs. This was a specific effect, since event-related coherence did not differ in a monotic control condition. Furthermore, event-related coherence between T3 and Cz and between T4 and Cz scalp sites showed no significant effects. Conversely, the directed transfer function results showed negligible influence at group level of right over left auditory cortex during dichotic listening. These results suggest a decrease of functional coupling between bilateral auditory cortices during competing dichotic stimuli as a possible neural substrate for the lateralization of auditory stimuli during dichotic listening. (c) 2005 Published by Elsevier Ltd on behalf of IBRO.