Knyazev Gennady G, Savostyanov Alexander N, Bocharov Andrey V, Dorosheva Elena A, Tamozhnikov Sergey S, Saprigyn Alexander E
Institute of Physiology and Basic Medicine, Siberian Branch of the Russian Academy of Medical Sciences, Novosibirsk, Russia.
Institute of Physiology and Basic Medicine, Siberian Branch of the Russian Academy of Medical Sciences, Novosibirsk, Russia; Novosibirsk StateUniversity, Novosibirsk, Russia; Tomsk State University, Tomsk, Russia.
Int J Psychophysiol. 2015 Mar;95(3):322-32. doi: 10.1016/j.ijpsycho.2014.12.006. Epub 2014 Dec 16.
Recollection of events from one's own life is referred to as autobiographical memory. Autobiographical memory is an important part of our self. Neuroimaging findings link self-referential processes with the default mode network (DMN). Much evidence coming primarily from functional magnetic resonance imaging studies shows that autobiographical memory and DMN have a common neural base. In this study, electroencephalographic data collected in 47 participants during recollection of autobiographical episodes were analyzed using temporal and spatial independent component analyses in combination with source localization. Autobiographical remembering was associated with an increase of spectral power in alpha and beta and a decrease in delta band. The increase of alpha power, as estimated by sLORETA, was most prominent in the posterior DMN, but was also observed in visual and motor cortices, prompting an assumption that it is associated with activation of DMN and inhibition of irrelevant sensory and motor areas. In line with data linking delta oscillations with aversive states, decrease of delta power was more pronounced in episodes associated with positive emotions, whereas episodes associated with negative emotions were accompanied by an increase of delta power. Vividness of recollection correlated positively with theta oscillations. These results highlight the leading role of alpha oscillations and the DMN in the processes accompanying autobiographical remembering.
对个人生活中事件的回忆被称为自传体记忆。自传体记忆是我们自我的重要组成部分。神经影像学研究结果将自我参照过程与默认模式网络（DMN）联系起来。主要来自功能磁共振成像研究的大量证据表明，自传体记忆和DMN有共同的神经基础。在本研究中，对47名参与者在回忆自传体事件期间收集的脑电图数据进行了分析，采用了时间和空间独立成分分析并结合源定位。自传体记忆与α和β频段的频谱功率增加以及δ频段的功率降低有关。根据sLORETA估计，α功率的增加在DMN后部最为显著，但在视觉和运动皮层也有观察到，这促使人们假设它与DMN的激活以及无关感觉和运动区域的抑制有关。与将δ振荡与厌恶状态联系起来的数据一致，δ功率的降低在与积极情绪相关的事件中更为明显，而与消极情绪相关的事件则伴随着δ功率的增加。回忆的生动程度与θ振荡呈正相关。这些结果突出了α振荡和DMN在自传体记忆相关过程中的主导作用。
