Guiding the study of brain dynamics by using first-person data: Synchrony patterns correlate with ongoing conscious states during a simple visual task
Guiding the study of brain dynamics by using first-person data: Synchrony patterns correlate with ongoing conscious states during a simple visual task
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DOI：
10.1073/pnas.032658199
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发表时间：
2002-02-05
影响因子：
11.1
通讯作者：
Varela, FJ
中科院分区：
文献类型：
--
作者：
Lutz, A;Lachaux, JP;Varela, FJ
即使在校准良好的认知任务中，大脑对重复相同刺激的连续反应也是高度可变的。这种变异性的来源被认为主要存在于受试者的认知“背景”的波动中，这些“背景”由他/她的注意状态、自发的思维过程、执行任务的策略等来定义。由于这些因素很难精确操纵，它们通常不受控制，并且通过平均技术丢弃可变性。我们结合第一人称数据和神经过程分析来减少这种噪音。我们向受试者展示了一个三维错觉，并记录了他们的脑电活动和他们自己对认知环境的报告。根据这些第一人称数据对试验进行聚类，并对每个聚类进行单独的动态分析。我们发现：（1）刺激前额叶电极出现内源性同步的特征模式。这些模式取决于准备的程度和口头报告的即时感知。(ii)这些模式对于几个记录是稳定的。(iii)准备状态调节行为表现和随后的诱发和诱导同步模式。(iv)这些结果表明，第一人称数据可用于检测和解释神经过程。
Even during well-calibrated cognitive tasks, successive brain responses to repeated identical stimulations are highly variable. The source of this variability is believed to reside mainly in fluctuations of the subject's cognitive "context" defined by his/her attentive state, spontaneous thought process, strategy to carry out the task, and so on... As these factors are hard to manipulate precisely, they are usually not controlled, and the variability is discarded by averaging techniques. We combined first-person data and the analysis of neural processes to reduce such noise. We presented the subjects with a three-dimensional illusion and recorded their electrical brain activity and their own report about their cognitive context. Trials were clustered according to these first-person data, and separate dynamical analyses were conducted for each cluster. We found that (i) characteristic patterns of endogenous synchrony appeared in frontal electrodes before stimulation. These patterns depended on the degree of preparation and the immediacy of perception as verbally reported. (ii) These patterns were stable for several recordings. (iii) Preparatory states modulate both the behavioral performance and the evoked and induced synchronous patterns that follow. (iv) These results indicated that first-person data can be used to detect and interpret neural processes.