University of Oregon and University of Illinois at Urbana-Champaign.
J Cogn Neurosci. 1997 Nov;9(6):799-823. doi: 10.1162/jocn.1997.9.6.799.
A long-standing question in attention research is the extent to which selection involves gates in the sensory stream and the extent to which they involve added secondary processes. Intermodal attention paradigms are useful for examining this issue since different modalities involve readily distinguished cortical regions. Evoked potential studies have identified an attention-related frontal negativity labeled the Nd in auditory attention studies. It has been suggested that it arises from modulation of the auditory cortex (compatible with gating mechanisms) or of the frontal cortex (compatible with secondary processes such as short-term memory buffers). Efforts to localize the Nd have been impaired by the finding that the Nd comprises multiple components. Some novel procedures utilizing principal components analysis, in conjunction with high-density 64-channel recordings, were used to address this issue. Results suggest that the major source of the early Nd (the portion of most interest) resides in the frontal cortex, supporting the secondary process view for this particular mechanism.
注意力研究中长期存在的一个问题是，选择在多大程度上涉及感觉流中的门，以及在多大程度上涉及额外的次级过程。多模态注意范式对于研究这个问题很有用，因为不同的模态涉及到易于区分的皮质区域。诱发电位研究已经确定了一个与注意相关的额部负向波，在听觉注意研究中被标记为 Nd。有人认为它源于听觉皮层的调制（与门控机制兼容）或额叶皮层的调制（与短期记忆缓冲区等次级过程兼容）。定位 Nd 的努力受到以下发现的阻碍：Nd 由多个成分组成。一些利用主成分分析的新程序，结合高密度 64 通道记录，被用来解决这个问题。结果表明，早期 Nd 的主要来源（最感兴趣的部分）位于额叶皮层，这支持了该特定机制的次级过程观点。
