Effects of working memory load on oscillatory power in human intracranial EEG.
Effects of working memory load on oscillatory power in human intracranial EEG.
复制标题
工作记忆负荷对人颅内脑电图中振荡能力的影响。
DOI：
10.1093/cercor/bhm213
复制
发表时间：
2008-08
期刊：
影响因子：
3.7
通讯作者：
Constable, R. Todd
中科院分区：
文献类型：
--
作者：
Meltzer, Jed A.;Zaveri, Hitten P.;Goncharova, Irina I.;Distasio, Marcello M.;Papademetris, Xenophon;Spencer, Susan S.;Spencer, Dennis D.;Constable, R. Todd
工作记忆负荷对人脑电功率影响的研究表明，在不同的频带中，工作记忆负荷对脑电功率的影响不同。尽管伽马功率通常随负载而增加，但较低频率θ和α频带的负载依赖性是不确定的。我们从14名执行斯滕贝格任务的癫痫患者的1453个电极部位获得了颅内脑电图测量值，以表征整个频谱上负载相关变化的解剖分布。伽马功率增加发生在整个大脑，但最常见于枕叶。在θ和α波段，观察到增加和减少，但具有不同的解剖分布。θ和α功率的增加在额叶中线皮层中最为普遍。降低最常见于枕叶皮质，与γ范围的增加共定位，但也在侧额和顶叶区域检测到。除中央前回外，与组功能磁共振成像结果的空间重叠最小。这些发现表明，在任何给定的频带的功率不是一个单一的现象;相反，在同一频带的反应在不同的大脑区域，并可能涉及到在认知任务中的一个给定的区域的参与或抑制。
Studies of working memory load effects on human EEG power have indicated divergent effects in different frequency bands. Although gamma power typically increases with load, the load dependency of the lower frequency theta and alpha bands is uncertain. We obtained intracranial electroencephalography measurements from 1453 electrode sites in 14 epilepsy patients performing a Sternberg task, in order to characterize the anatomical distribution of load-related changes across the frequency spectrum. Gamma power increases occurred throughout the brain, but were most common in the occipital lobe. In the theta and alpha bands, both increases and decreases were observed, but with different anatomical distributions. Increases in theta and alpha power were most prevalent in frontal midline cortex. Decreases were most commonly observed in occipital cortex, colocalized with increases in the gamma range, but were also detected in lateral frontal and parietal regions. Spatial overlap with group functional magnetic resonance imaging results was minimal except in the precentral gyrus. These findings suggest that power in any given frequency band is not a unitary phenomenon; rather, reactivity in the same frequency band varies in different brain regions, and may relate to the engagement or inhibition of a given area in a cognitive task.
登录
查看更多内容
DOI：
10.1073/pnas.0504136102
发表时间：
2005-07-05
影响因子：
11.1
作者：
Fox, MD;Snyder, AZ;Raichle, ME
通讯作者：
Raichle, ME
DOI：
10.1016/s0926-6410(98)00056-1
发表时间：
1999-03-01
期刊：
COGNITIVE BRAIN RESEARCH
影响因子：
--
作者：
Klimesch, W;Doppelmayr, M;Winkler, T
通讯作者：
Winkler, T
影响因子：
5.7
作者：
Daselaar, SM;Prince, SE;Cabeza, R
通讯作者：
Cabeza, R
影响因子：
5.3
作者：
Axmacher, Nikolai;Mormann, Florian;Fell, Juergen
通讯作者：
Fell, Juergen
影响因子：
4.7
作者：
Bastiaansen, MCM;Posthuma, D;de Geus, EJC
通讯作者：
de Geus, EJC