Interhemispheric differences of sleep EEG complexity

• Authors: W. Szelenberger , J. Wackermann , M. Skalski , J. Drojewski , S. Niemcewicz
• Languages of publication: EN

Abstracts

EN

Complexity of EEG (W), a global measure reflecting degree of spatial synchronization, was computed for whole night recordings of sleep EEG of 10 healthy volunteers, 9 males and 1 female (age 21-53) and 6 depressive patients, 5 males and 1 female (age 23-64). Sleep was scored visually in 20's epochs, W was calculated in 2.5 s segments and the median from 8 segments (20 s) was calculated. W was calculated for the whole field of 21 electrodes and for the left and right hemisphere separately (2 x 8 electrodes). Measure of global power (S) and generalized frequency (f) were also computed for the same data. In healthy subjects the complexity was higher over the right hemisphere during waking, and the difference shifted to higher complexity over the left hemisphere in slow wave sleep (F=5.15, df1=4, df2=6856, P<0.0005). The opposite trend was found in depressives (F=10.51, dfl=4, df2=3960, P<0.0001).

Keywords

EN

DEPRESSION; EEG COMPLEXITY; INTERHEMISPHERIC DIFFERENCE; SLEEP

Discipline

• EXPERIMENTAL_BIOLOGY_&_MEDICINE: EXPERIMENTAL BIOLOGY & MEDICINE

• Publisher: Marceli Nencki Institute of Experimental Biology, Polish Academy of Sciences
• Journal: Acta Neurobiologiae Experimentalis
• Year: 1996
• Volume: 56
• Issue: 4
• Pages: 955-959

Contributors

author

W. Szelenberger

author

J. Wackermann

author

M. Skalski

author

J. Drojewski

author

S. Niemcewicz

• Document Type: article
• Publication order reference: W.Szelenberger, Dept. of Psychiatry, Medical Academy, 27 Nowowiejska St., 00-665 Warsaw, Poland