EEG oscillations during menstrual cycle.
12 sessions of EEG activity, one every second day, were recorded at F3, F4, C3, C4, P3, P4, O1 and O2 in 9 women with regular menstrual cycles. The following significant oscillations were observed: 1) absolute power was lower during periovulatory period; 2) absolute power of delta theta and alpha 1 was higher during premenstrual period whereas absolute power of alpha 2, beta 1 and beta 2 was higher during menstruation; 3) relative power of low alpha frequencies was lower and that of high frequencies was higher during premenstrual period; 4) interhemispheric correlation between frontals was higher during ovulation and between occipitals was higher during premenstrual phase; 5) no significant power asymmetries were observed. The present findings suggest higher activation of centro-parietal regions during menstruation and lower activation of frontal regions during premenstrual phase.
Solís-Ortiz
S
S
Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, México, D.F.
Ramos
J
J
Arce
C
C
Guevara
M A
MA
Corsi-Cabrera
M
M
D000328:Adult; D000513:Alpha Rhythm; D001611:Beta Rhythm; D001921:Brain / Q000502:physiology*; D003700:Delta Rhythm; D004569:Electroencephalography; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D008597:Menstrual Cycle / Q000502:physiology*; D013826:Theta Rhythm