Amplitude envelope correlation detects coupling among incoherent brain signals
Amplitude envelope correlation detects coupling among incoherent brain signals
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DOI：
10.1097/00001756-200005150-00028
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发表时间：
2000-05-15
期刊：
影响因子：
1.7
通讯作者：
Ebner, A
中科院分区：
文献类型：
--
作者：
Bruns, A;Eckhorn, R;Ebner, A
认知处理涉及到广泛的大脑皮层区域的伽马激活。在相距较远的地区，这些活动的阶段耦合很少有报道。其他形式的耦合通常不能通过常规方法检测到。在这里，我们使用幅度包络相关(AEC)，它可以检测信号之间的无相位相干，甚至不同频率之间的耦合。我们将其应用于人类执行视觉延迟匹配到样本任务的硬膜下记录，并系统地将其与光谱幅度和相干性进行比较。不同的措施往往会显示出不同的结果。特别是，AEC揭示了相干完全忽略的伽马耦合。我们认为，相干和AEC分别适用于不同的短程和长程相互作用的皮质机制。《神经报告》11：1509-1514(C)2000 Lippincott Williams&Wilkins.
Cognitive processing involves gamma-activation over broad cortical regions. Phase coupling of these activities has rarely been reported for areas far apart. Other forms of coupling are generally not detected by conventional measures. Here, we use amplitude envelope correlation (AEC), which can detect signal coupling without phase coherence, even among different frequencies. We apply it to subdural recordings from humans performing a visual delayed match-to-sample task and systematically compare it with spectral amplitude and coherence. The different measures often show divergent results. In particular, AEC reveals gamma-coupling completely missed by coherence. We argue that coherence and AEC are adapted to different cortical mechanisms of short- and long-range interactions, respectively. NeuroReport 11:1509-1514 (C) 2000 Lippincott Williams & Wilkins.