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ID 25741
file
title alternative
Effects of ultradian variation on the spatial and temporal cognitive judgment
creator
Hori, Tadao
Morikawa, Toshio
subject
Ultradian rhythm
cognitive task
BRAC
EEG
coherence
laterality index
NDC
Medical sciences
abstract
The structures of the ultradian variations among the cognitive task performance and the EEG activities were studied on eight male students. Referential central (C3, C4) and parietal (P3, P4) EEGs were recorded every 15 min of the eye closed rest period, when the subjects were asked to estimate a 120 sec period and to keep eyes closed for this period. Artifact free EEG data were analyzed for one minute by the FFT. EEG parameters used in this study are the amplitude (root power)

EEG laterality index and interhemispheric coherence. The EEG data were divided into five frequency bands (δ, θ, α, β1, β2).

After the time estimation task, subjects were asked to draw a vertical or horizontal 20 cm line and to point the midpoint of these lines.

The least square spectral method was applied on the time series of five task performance and EEG variables. About 100 min ultradian variations were identified in all of the variables, with the exception of the midpoint judgment which showed more shorter period, about 60 min cycles. Principal component analysis were examined on the task performance EEG variables. The results of PCA revealed that the EEG indicies of the interhemispheric activity were more closely related to the task performance than the single EEG amplitude. The EEG latelality indicies were highly correlated to the vertical line drawing, while the interhemispheric coherence were highly correlated to the horizontal line drawing. Anisotropy of space were observed in the daytime behavioral ultradian variations.
journal title
Memoirs of the Faculty of Integrated Arts and Sciences. III, Studies in information and behavior sciences
volume
Volume 12
start page
1
end page
13
date of issued
1989-02-28
publisher
広島大学総合科学部
issn
0385-1478
ncid
SelfDOI
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 1988 by Faculty of Integrated Arts and Sciences, Hiroshima University. All rights reserved.
department
Graduate School of Integrated Arts and Sciences
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