Gundel A, Wilson G F
DLR-Institute for Aerospace Medicine, Linder Höhe, Federal Republic of Germany.
Brain Topogr. 1992 Fall;5(1):17-25. doi: 10.1007/BF01129966.
An experiment was carried out to investigate the hypothesis that task difficulty is reflected in changes in the topographical distribution of the ongoing EEG. Subjects had to perform three different tasks at two difficulty levels each; the Sternberg memory scanning task in an auditory and in a visual mode and a task whose performance required mainly visual scanning. Task difficulty was verified by the measurement of response times. Using a commercial Brain Electrical Activity Mapping device, EEG was recorded from 19 scalp electrodes while the subjects performed the tasks. Spectral matrices of the EEG were calculated to investigate spatial relationships in the EEG. Compared to the lower level, higher task difficulty resulted in EEG changes that led to the identification of two factors. One was the reduction of parietal and occipital alpha activity due to the amount of visual scanning and the other an increase of theta activity in the left frontal electrodes which may be associated with the amount of general mental processing.
进行了一项实验，以研究任务难度是否反映在持续脑电图（EEG）地形分布的变化中。受试者必须在两个难度级别上分别执行三种不同的任务；听觉和视觉模式下的斯特恩伯格记忆扫描任务，以及一项主要需要视觉扫描的任务。通过测量反应时间来验证任务难度。使用商业脑电活动映射设备，在受试者执行任务时，从19个头皮电极记录脑电图。计算脑电图的频谱矩阵以研究脑电图中的空间关系。与较低难度级别相比，较高的任务难度导致脑电图变化，从而识别出两个因素。一个是由于视觉扫描量导致顶叶和枕叶α活动减少，另一个是左额叶电极中θ活动增加，这可能与一般心理加工量有关。
