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PMID: 9169538 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Regional cerebral blood flow changes as a function of delta and spindle activity during slow wave sleep in humans.

Hofle N, Paus T, Reutens D, Fiset P, Gotman J, Evans AC, Jones BE

Abstract

In the present study, we investigated changes in regional cerebral blood flow (rCBF) in humans during the progression from relaxed wakefulness through slow wave sleep (SWS). These changes were examined as a function of spindle (12-15 Hz) and delta (1.5-4.0 Hz) electroencephalographic (EEG) activity of SWS. rCBF was studied with positron emission tomography (PET) using the H215O bolus method. A maximum of six 60 sec scans were performed per subject during periods of wakefulness and stages 1-4 of SWS, as determined by on-line EEG monitoring. Spectral analysis was performed off-line on the EEG epochs corresponding to the scans for computation of activity in specific frequency bands. The relationship between EEG frequency band activity and normalized rCBF was determined by means of a voxel-by-voxel analysis of covariance. delta activity covaried negatively with rCBF most markedly in the thalamus and also in the brainstem reticular formation, cerebellum, anterior cingulate, and orbitofrontal cortex. After the effect of delta was removed, a significant negative covariation between spindle activity and the residual rCBF was evident in the medial thalamus. These negative covariations may reflect the disfacilitation and active inhibition of thalamocortical relay neurons in association with delta and spindles, as well as the neural substrates underlying the progressive attenuation of sensory awareness, motor responsiveness, and arousal that occur during SWS. delta activity covaried positively with rCBF in the visual and auditory cortex, possibly reflecting processes of dream-like mentation purported to occur during SWS.

MeSH Terms
Adult Brain/blood supply,diagnostic imaging,physiology Delta Rhythm Electroencephalography Electromyography Electrooculography Female Humans Male Regional Blood Flow Sleep Stages/physiology Tomography, Emission-Computed Wakefulness/physiology
Authors & Affiliations
7 authors, click to expand affiliations / ORCID
Hofle N
McConnell Brain Imaging Centre, Montreal Neurological Institute, Montréal, Québec, Canada H3A 2B4.
Paus T
Reutens D
Fiset P
Gotman J
Evans A C
Jones B E
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Article Info
Journal
The Journal of neuroscience : the official journal of the Society for Neuroscience
Abbr.
J Neurosci
ISSN
0270-6474
Published
1997-06-15
Pages
4800-8
Language
English
Region
United States
NLM ID
8102140
PMCID
PMC6573353
Subset
IM
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