Encoding of visual-spatial information in working memory requires more cerebral efforts than retrieval: Evidence from an EEG and virtual reality study.
Encoding of visual-spatial information in working memory requires more cerebral efforts than retrieval: Evidence from an EEG and virtual reality study.
复制标题
DOI：
10.1016/j.brainres.2010.05.086
复制
发表时间：
2010-08-06
期刊：
影响因子：
2.9
通讯作者：
Slobounov, S.
中科院分区：
文献类型：
--
作者：
Jaiswal, N.;Ray, W.;Slobounov, S.
视觉空间工作记忆任务可分为编码和检索两个阶段。据推测，视觉空间信息的编码比检索更具认知挑战性。这是通过脑电图与虚拟现实范式相结合来观察脑电图活动的调制来验证的。脑电功率分析结果显示，与检索相比，在编码期间θ活动增加，而在检索期间α活动明显高于编码。我们发现编码比检索需要更多的大脑努力。此外，在功能磁共振成像研究中，我们观察到编码/检索翻转，编码和检索不同地激活了相似的神经基质。在编码过程中，sLORETA识别的皮质源位于背外侧前额叶皮层（DLPFC）的下额回，而在检索过程中，则识别了下顶叶和楔前叶皮质源。我们进一步将我们的结果与检查默认网络的研究联系起来，该研究表明DLPFC的激活增加发生在对大脑挑战增加的反应中，而后顶叶区在基线或内部处理任务中显示激活。我们得出结论，通过VR导航任务编码视觉空间信息比检索更具大脑挑战性。
Visual-spatial working memory tasks can be decomposed into encoding, and retrieval phases. It was hypothesized that encoding of visual-spatial information is cognitively more challenging than retrieval. This was tested by combining Electroencephalography with a Virtual Reality paradigm to observe the modulation in EEG activity. EEG power analysis results demonstrated an increase in theta activity during encoding in comparison to retrieval whereas alpha activity was significantly higher for retrieval in comparison to encoding. We found that encoding required more cerebral efforts than retrieval. Further, as seen in fMRI studies we observed an encoding/retrieval flip in that encoding and retrieval differentially activated similar neural substrates. Results obtained from sLORETA identified cortical sources in inferior frontal gyrus which is a part of dorsolateral prefrontal cortex (DLPFC) during encoding, whereas the inferior parietal lobe and precuneus cortical sources were identified during retrieval. We further tie our results into studies examining the default network which have shown increased activation in DLPFC occurs in response to increased cerebral challenge while posterior parietal areas show activation during baseline or internal processing tasks. We conclude that encoding of visual-spatial information via VR navigation task is more cerebrally challenging than retrieval.
登录
查看更多内容
影响因子：
2.6
作者：
Berryhill, Marian E.;Olson, Ingrid R.
通讯作者：
Olson, Ingrid R.
影响因子：
2.5
作者：
D'Esposito, M;Postle, BR;Lease, J
通讯作者：
Lease, J
DOI：
10.1016/s0926-6410(01)00024-6
发表时间：
2001-08-01
期刊：
COGNITIVE BRAIN RESEARCH
影响因子：
--
作者：
Klimesch, W;Doppelmayr, M;Gruber, W
通讯作者：
Gruber, W
影响因子：
4.8
作者：
Hillary, Frank G.;Genova, Helen M.;DeLuca, John
通讯作者：
DeLuca, John
影响因子：
4.7
作者：
Krause, CM;Sillanmäki, L;Hämäläinen, H
通讯作者：
Hämäläinen, H