Topographic variations in EEG asymmetry during sleep.
EEG signals were recorded in 11 normal subjects from F4-C4, F3-C3, P4-O2 and P3-O1 during both stage 2 and the REM stage of each NREM/REM cycle. The logarithm of the right/left ratio for the power in the range of the various frequency bands showed a prevalent right-side asymmetry only with the fronto-central derivations. This trend, observed for all frequency bands, remained stable over the various NREM/REM cycles with the exception of the last one. These data indirectly support the hypothesis that the right hemisphere is more heavily involved in dreaming than the left, and suggest a prevalent involvement of the anterior regions.
Bonanni
E
E
Institute of Neurology, University of Pisa, Italy.
Murri
L
L
Stefanini
A
A
Barcaro
U
U
Denoth
F
F
Navona
C
C
D000328:Adult; D001322:Autoanalysis; D004569:Electroencephalography; D006801:Humans; D008297:Male; D012016:Reference Values; D012890:Sleep / Q000502:physiology*; D012895:Sleep, REM / Q000502:physiology