Wavelet coherence of EEG signals for a visual oddball task

被引:29
|
作者
Qassim, Yahya T. [1 ]
Cutmore, Tim R. H. [2 ]
James, Daniel A. [1 ]
Rowlands, David D. [1 ]
机构
[1] Griffith Univ, Ctr Wireless Monitoring & Applicat, Brisbane, Qld 4111, Australia
[2] Griffith Univ, Sch Psychol, Brisbane, Qld 4111, Australia
关键词
ERP component; Cognition; Gamma band; Oddball test; Wavelet coherence; GAMMA-BAND ACTIVITY; INTEGRATIVE THEORY; PREFRONTAL CORTEX; TRANSFORM; BRAIN; P300; CONNECTIVITY; RESPONSES; STIMULI; HUMANS;
D O I
10.1016/j.compbiomed.2012.10.008
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Neural co-activation in frontal and central cortex was examined during a visual oddball task using wavelet coherence. EEG was recorded during a visual oddball task, presented to 12 participants with a random mix of 15% oddball targets and 85% frequent non-target letters over 265 trials. Wavelet coherence of individual trials was shown to distinguish frequent and oddball trials. Averaged wavelet coherence showed significant differences: oddball targets showed higher delta-theta activity whereas frequent background stimuli showed higher gamma activity. Increased gamma coherence appeared to be related to expectation of the targets with our analysis showing an R-2 of 0.935 for the relationship between averaged sections of gamma coherence and the number of intervening (frequent) trials since the last oddball. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:23 / 31
页数:9
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