Papousek I, Schulter G
University of Graz, Department of Psychology, Austria. ilona.papousek@k funigraz.ac.at
Int J Neurosci. 1998 Feb;93(1-2):87-100. doi: 10.3109/00207459808986415.
In order to investigate a possible regional specificity of activation asymmetries of different parts of the cortex and the stability of these asymmetries across time and conditions, EEG was recorded during rest and stimulation conditions in a large sample of right-handed university students (n = 60). Recordings were made in two sessions (interval between sessions 2-4 weeks). In the first session two rest periods were conducted (interval 30 min) and one under stimulation. In the second session EEG was again recorded at rest. Reliability analyses show that the long-term stability of orbitofrontal asymmetries is markedly lower than that of dorsolateral, temporal, and parietal scores. Intercorrelations of EEG asymmetries at different electrode positions suggest that anterior and posterior EEG asymmetries are largely independent measures of cortical laterality. Both this partial independence of activation asymmetries and the differences in temporal stability underscore the significance of the anterior-posterior dimension in laterality research and may be one reason for several contradictory observations in studies on brain laterality.
为了研究大脑皮层不同部位激活不对称的可能区域特异性以及这些不对称在不同时间和条件下的稳定性，我们对大量右利手大学生（n = 60）在静息和刺激条件下进行了脑电图（EEG）记录。记录分两个阶段进行（两个阶段间隔2 - 4周）。在第一阶段，进行了两次静息期（间隔30分钟）和一次刺激期。在第二阶段，再次在静息状态下记录脑电图。可靠性分析表明，眶额叶不对称的长期稳定性明显低于背外侧、颞叶和顶叶得分的稳定性。不同电极位置的脑电图不对称之间的相互关联表明，前部和后部脑电图不对称在很大程度上是皮层偏侧性的独立测量指标。激活不对称的这种部分独立性以及时间稳定性的差异都强调了前后维度在偏侧性研究中的重要性，这可能是大脑偏侧性研究中一些相互矛盾观察结果的原因之一。
