Alpha reduction and event-related potentials, theta and gamma increase linked to letter selection

被引：4

作者：

Digiacomo, Marcia R. ^{[1
]}

Gomez, Carlos M. ^{[1
]}

Flores, Angelica B. ^{[1
]}

机构：

[1] Univ Seville, Dept Expt Psychol, E-41009 Seville, Spain

来源：

NEUROREPORT | 2007年 / 18卷 / 08期

关键词：

alpha reduction; electroencephalograph; event-related potential; gamma oscillations; induced; theta oscillations; visual attention;

D O I：

10.1097/WNR.0b013e3280c1e370

中图分类号：

Q189 [神经科学];

学科分类号：

071006 ;

摘要：

We examined evoked and induced modulations in theta, alpha and gamma oscillations, and also the P2 and late positive component of event-related potentials, during a visual discrimination task with target and nontarget letters. Results for target letters showed a decrease in the amplitude of alpha-band (10-11 Hz) activity and an increase in theta (4-7 Hz) and gamma (40-44 Hz) activities around 350 ms after stimulation. P2 and late positive component presented a higher amplitude to target than to repeated nontarget letters. Alpha reduction was inversely related to theta and late positive component increase. Moreover, gamma oscillation amplitude was directly related to theta amplitude. The findings suggest the importance of occipitoparietal alpha reduction for the development of task-related neuronal activity.

引用

页码：729 / 733

页数：5

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