[Diurnal variations of the composition of cognitive evoked potentials].
Auditory evoked potentials are recorded in 12 subjects 4 times per day: 08 30, 11 30, 14 30 and 18 30. The daily variations of N1, P2, N2 and P3 are studied globally and according to the (morning- or evening) type of subjects. The latency of N2 decreases during the day; it possibly reflects variations in vigilance. The P3 amplitude varies according to the subject typology: for morning-type subjects, P3 is higher in the afternoon than in the morning, and for evening-type subjects, P3 decreases from morning to evening. These evolutions possibly reflect the effort in attention required by different tasks.
Laboratoire de psychologie du langage, UA 666, CNRS, université de Poitiers, France.
G
G
Querrioux-Coulombier
R
R
Gil
D000293:Adolescent; D000328:Adult; D001143:Arousal / Q000502:physiology; D002940:Circadian Rhythm / Q000502:physiology*; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male
Variations journalières des composantes des potentiels évoqués cognitifs.