Lamberts J, van Den Broek P L, Bener L, van Egmond J, Dirksen R, Coenen A M
NICI, Department of Psychology, University of Nijmegen, The Netherlands.
Neuropsychobiology. 2000;41(3):149-53. doi: 10.1159/000026647.
This study aimed at assessing the effects of cognitive activity and mental task load on the correlation dimension of the human electroencephalogram (EEG). Three experimental conditions were created: a baseline condition and two cognitive task conditions, a calculation task and a time estimation task. The calculation task was supposed to induce a higher mental load than the time estimation task, which is regarded as a less complex one. This was verified by a subjective rating scale. All conditions differed significantly in subjective estimated task load. The correlation dimension appeared to be higher in both task conditions compared to the baseline condition. A comparison of the two tasks indicated that the difference in correlation dimension between calculation and time estimation was also significant, with the highest value for calculation. It is concluded that cognitive and mental activity is associated with a higher correlation dimension in the EEG. This implies that the correlation dimension is a sensitive parameter in the analysis of electrical brain activity.
本研究旨在评估认知活动和心理任务负荷对人类脑电图（EEG）相关维度的影响。创建了三种实验条件：一种基线条件和两种认知任务条件，即计算任务和时间估计任务。计算任务被认为比时间估计任务会诱发更高的心理负荷，时间估计任务被视为较简单的任务。这通过主观评分量表得到了验证。所有条件在主观估计的任务负荷方面存在显著差异。与基线条件相比，两种任务条件下的相关维度似乎都更高。两项任务的比较表明，计算任务和时间估计任务之间的相关维度差异也很显著，计算任务的值最高。得出的结论是，认知和心理活动与脑电图中更高的相关维度相关。这意味着相关维度是分析脑电活动的一个敏感参数。
