K. Ueda et al., Spatiotemporal changes of slow wave activities before and after 14 Hz/12 Hz sleep spindles during stage 2 sleep, PSY CLIN N, 55(3), 2001, pp. 183-184
The present study examined the spatiotemporal changes of slow wave (delta a
nd theta bands) activities before and after 14 Hz/12 Hz sleep spindles duri
ng stage 2 sleep, using topographic mapping of electroencephalogram (EEG) p
ower. Both types of sleep spindles appeared after slow wave activities of b
ackground EEG decreased. Moreover, the appearance of sleep spindles provide
d increasing EEG slow wave activities in the subsequent period. Further, th
e present results showed that an appearance of 14 Hz sleep spindle facilita
ted slow wave activities at the centro-parietal areas, while an appearance
of 12 Hz sleep spindle facilitated slow wave activities at the fronto-centr
al areas. These results suggest that sleep spindles provide cortical de-aro
usal, and serve to maintain sleep.