[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.
Querrioux-Coulombier
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Laboratoire de psychologie du langage, UA 666, CNRS, université de Poitiers, France.
Gil
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R
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.