A better estimate of the internal consistency reliability of frontal EEG asymmetry scores.
A better estimate of the internal consistency reliability of frontal EEG asymmetry scores.
复制标题
更好地估计额叶脑电图不对称评分的内部一致性可靠性。
DOI:
10.1111/j.1469-8986.2008.00759.x
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发表时间:
2009
期刊:
影响因子:
3.7
通讯作者:
Allen,JohnJB
中科院分区:
文献类型:
--
作者:
Towers,DavidN;Allen,JohnJB
Frontal alpha asymmetry is typically computed using alpha power averaged across many overlapping epochs. Previous reports have estimated the internal consistency reliability of asymmetry by dividing resting EEG sessions into segments of equal duration (e.g., 1 min) and treating asymmetry scores for each segment as “items” to estimate internal consistency reliability using Cronbach's alpha. Cronbach's alpha partly depends on the number of items, such that this approach may underestimate reliability by using less than the number of distinct items available. Reliability estimates for resting EEG data in the present study (204 subjects, 8 sessions) were obtained using mean split‐half correlations with epoch alpha power as treated as separate items. Estimates at all scalp sites and reference schemes approached .90 with as few as 100 epochs, suggesting the internal consistency of frontal asymmetry is greater than that previously reported.
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