Kustermann Thomas, Rockstroh Brigitte, Miller Gregory A, Popov Tzvetan
Department of Psychology, University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany.
Department of Psychology and Department of Psychiatry and Biobehavioral Sciences, UCLA, 1285 Franz Hall, Los Angeles, CA 90095-1563, United States.
Biol Psychol. 2018 Jul;136:119-126. doi: 10.1016/j.biopsycho.2018.05.018. Epub 2018 May 28.
Oscillatory brain activity in the theta, alpha, and gamma frequency ranges has been associated with working memory (WM). In addition to alpha and theta activity associated with WM retention, and gamma band activity with item encoding, activity in the alpha band is related to the deployment of attention resources and information. The present study sought to specify distinct roles of neuromagnetic 4-7 Hz theta, 9-13 Hz alpha, and 50-70 Hz gamma power modulation and communication in fronto-parietal networks during cued, hemifield-specific item presentation in a modified Sternberg verbal WM task in 14 student volunteers. Lateralized posterior alpha and gamma power during encoding suggest a preparatory role of alpha oscillations. Bilateral alpha power increases during maintenance reflect information retention for the non-lateralized probe response. Lateralized alpha power increase during encoding was apparently driven by a monotonic increase in fronto-parietal 6 Hz phase, suggesting a mechanism facilitating WM encoding and successful performance.
θ、α和γ频率范围内的脑振荡活动与工作记忆（WM）相关。除了与WM保持相关的α和θ活动，以及与项目编码相关的γ波段活动外，α波段的活动还与注意力资源和信息的分配有关。本研究旨在明确在14名学生志愿者参与的改良斯特恩伯格言语WM任务中，在提示性、半视野特定项目呈现期间，额顶叶网络中神经磁4 - 7Hz θ、9 - 13Hz α和50 - 70Hz γ功率调制及通信的不同作用。编码期间偏侧化的后部α和γ功率表明α振荡具有准备作用。维持期间双侧α功率增加反映了非偏侧化探测反应的信息保持。编码期间偏侧化的α功率增加显然是由额顶叶6Hz相位的单调增加驱动的，这表明存在一种促进WM编码和成功表现的机制。
