Internal consistency reliability of resting EEG power spectra in schizophrenic and normal subjects
作者:
THOMAS R. LUND,
SCOTT R. SPONHEIM,
WILLIAM G. IACONO,
BRETT A. CLEMENTZ,
期刊:
Psychophysiology
(WILEY Available online 1995)
卷期:
Volume 32,
issue 1
页码: 66-71
ISSN:0048-5772
年代: 1995
DOI:10.1111/j.1469-8986.1995.tb03407.x
出版商: Blackwell Publishing Ltd
关键词: EEG power spectra;Internal consistency reliability;Recording artifacts;Schizophrenia
数据来源: WILEY
摘要:
AbstractThe reliability of resting electroencephalogram (EEG) power spectra was assessed for 49 normal and 44 schizophrenic subjects. We specifically examined internal consistency reliability to determine how much EEG data are necessary to ensure small measurement error. Twenty‐one 8‐s epochs of resting EEG were collected from each subject from site Cz. Epochs containing artifacts or blinks were eliminated. Power was computed in the bands delta (0.125–3 Hz), theta (3.125–8 Hz), alpha (8.125–13 Hz), betal (13.125–20 Hz), beta2 (20.125–25 Hz), and beta3 (25.125–30 Hz). Internal consistency was computed using coefficient alpha (Cronbach, 1951). Results for both groups indicated that eight artifact‐free epochs of data were sufficient to give a coefficient alpha value of around .9. The schizophrenic and normal groups did not differ with respect to coefficient alpha. The proportion of artifacts in the data from the schizophrenics indicated that to obtain eight artifact‐free epochs from members of each group, 40% more data would be required from
点击下载:
PDF
(4399KB)
返 回