Gamma oscillatory activity in a visual discrimination task

被引：17

作者：

Freunberger, Roman ^{[1
]}

Klimesch, Wolfgang

Sauseng, Paul

Griesmayr, Birgit

Hoeller, Yvonne

Pecherstorfer, Thomas

Hanslmayr, Simon

机构：

[1] Salzburg Univ, Dept Psychol, A-5020 Salzburg, Austria

[2] Univ Regensburg, Dept Psychol, D-8400 Regensburg, Germany

来源：

BRAIN RESEARCH BULLETIN | 2007年 / 71卷 / 06期

关键词：

source analyses; BESA; LORETA; induced; evoked; gamma; ERP; ERD/ERS;

D O I：

10.1016/j.brainresbull.2006.11.014

中图分类号：

Q189 [神经科学];

学科分类号：

071006 ;

摘要：

We tested the hypothesis whether images of real objects elicit stronger gamma (>25 Hz) synchronization, when compared with scrambled objects. The background of this study is a recent debate about the functional meaning of evoked and induced gamma oscillations. Brain electrical source analysis (BESA) and low resolution electromagnetic tomography analysis (LORETA) was performed on the basis of the event-related potential (ERP) data. A component at around 230 ms (termed C230) showed strongest differences between objects and scrambled objects. Time-frequency analyses were run across electrodes and within the dipole sources. We found increased gamma event-related synchronization (ERS) between 200 and 300 ms for real objects. This effect was strongest in a fronto-medial source. Induced gamma, as also shown in previous studies, reflects the more task-relevant mechanism where object representations become activated. (c) 2006 Elsevier Inc. All rights reserved.

引用

页码：593 / 600

页数：8

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