Magnetic detection of sleep spindles in normal subjects.
The magnetoencephalogram (MEG) and electroencephalogram (EEG) were recorded simultaneously from 3 normal subjects during light sleep. The extracranial magnetic field patterns associated with the ionic currents within the brain (MEG) were measured using a SQUID magnetometer in a magnetically shielded room. Although a previous report indicated that there are few sleep spindles in MEG records, we observed many in all 3 subjects. We believe this is because measurements were made vertically at the vertex region.
Institute of Brain Diseases, Tohoku University School of Medicine, Sendai, Japan.
N
N
Nakasato
H
H
Kado
M
M
Nakanishi
M
M
Koyanagi
N
N
Kasai
H
H
Niizuma
T
T
Yoshimoto
D000328:Adult; D000513:Alpha Rhythm; D002540:Cerebral Cortex / Q000502:physiology; D004569:Electroencephalography; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D012016:Reference Values; D012890:Sleep / Q000502:physiology*