High frequency waking EEG: reflection of a slow ultradian rhythm in daytime arousal.
Neuroreport
; 11(10): 2223-7, 2000 Jul 14.
Article
de En
| MEDLINE
| ID: mdl-10923675
ABSTRACT
The ultradian dynamics of the human waking EEG was studied using a short visual fixation task repeated every 10 min throughout the daytime. The EEG spectra obtained from the tasks were assessed for time effect and ultradian periodicity. Fronto-central EEG high frequency powers (22.5-44.5 Hz) decreased at the time of the midafternoon vigilance dip (14.00-17.00 h) along with slight concomitant increases in parietal alpha (7.5-13.5 Hz) and delta (1-3 Hz) powers. A slow ultradian rhythm with a 3-4 h periodicity strongly modulated EEG power in all frequency bands between 1 and 44.5 Hz. The high frequency waking EEG may well reflect the activity of a brain arousal process underlying maintenance of the waking state probably throughout the 24 h cycle.
Recherche sur Google
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Éveil
/
Vigilance
/
Cycles d'activité
/
Cortex cérébral
/
Électroencéphalographie
Limites:
Adult
/
Humans
/
Male
Langue:
En
Journal:
Neuroreport
Sujet du journal:
NEUROLOGIA
Année:
2000
Type de document:
Article
Pays d'affiliation:
France