Woods D L, Alho K, Algazi A
Dept. of Neurology, UC Davis, VA Medical Center, Martinez 94553.
Neuroreport. 1991 Apr;2(4):189-92. doi: 10.1097/00001756-199104000-00007.
We recorded event-related brain potentials (ERPs) to random dichotic tone sequences as subjects attended to tone bursts of a designated pitch (250, 1000 or 4000 Hz) and ear of delivery. The effects of attention were isolated as negative difference (Nd) waves by subtracting ERPs to ignored tones from ERPs to the same tones when either one or both features were attended. Early sensory components of the ERP changed tonotopically in scalp distribution, while the distributions of Nd waves were feature-specific (pitch processing differed from location processing) but not tonotopic. At longer latencies, Nd waves specific to feature-conjunction operations were isolated. These began 40-50 ms after Nds to isolated cues and continued for hundreds of ms.
我们记录了与事件相关的脑电位（ERPs），以应对随机的双耳分听音调序列，此时受试者专注于指定音高（250、1000或4000赫兹）和传送耳朵的音调突发。通过从对相同音调的ERPs中减去对被忽略音调的ERPs，将注意力的影响分离为负向差异（Nd）波，当一个或两个特征都被关注时。ERP的早期感觉成分在头皮分布上呈音调拓扑变化，而Nd波的分布是特征特异性的（音高处理与位置处理不同），但不是音调拓扑的。在较长潜伏期时，分离出了特定于特征结合操作的Nd波。这些波在对孤立线索的Nd波之后40 - 50毫秒开始，并持续数百毫秒。
