title: EEG Bands of Wakeful Rest, Slow-Wave and Rapid-Eye-Movement Sleep at Different Brain Areas in Rats.
abstract: Accumulating evidence reveals that neuronal oscillations with various frequency bands in the brain have different physiological functions. However, the frequency band divisions in rats were typically based on empirical spectral distribution from limited channels information. In the present study, functionally relevant frequency bands across vigilance states and brain regions were identified using factor analysis based on 9 channels EEG signals recorded from multiple brain areas in rats. We found that frequency band divisions varied both across vigilance states and brain regions. In particular, theta oscillations during REM sleep were subdivided into two bands, 5-7 and 8-11 Hz corresponding to the tonic and phasic stages, respectively. The spindle activities of SWS were different along the anterior-posterior axis, lower oscillations (~16 Hz) in frontal regions and higher in parietal (~21 Hz). The delta and theta activities co-varied in the visual and auditory cortex during wakeful rest. In addition, power spectra of beta oscillations were significantly decreased in association cortex during REM sleep compared with wakeful rest. These results provide us some new insights into understand the brain oscillations across vigilance states, and also indicate that the spatial factor should not be ignored when considering the frequency band divisions in rats.
authors.affiliation: Key Laboratory for NeuroInformation of Ministry of Education, Center for Information in BioMedicine, School of Life Science and Technology, University of Electronic Science and Technology of China Chengdu, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Jing
authors.affiliation: Key Laboratory for NeuroInformation of Ministry of Education, Center for Information in BioMedicine, School of Life Science and Technology, University of Electronic Science and Technology of China Chengdu, China.
authors.forename: Yanran
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Herpetology, Chengdu Institute of Biology, Chinese Academy of Sciences Chengdu, China.
authors.forename: Guangzhan
authors.initials: G
authors.lastname: Fang
authors.affiliation: Key Laboratory for NeuroInformation of Ministry of Education, Center for Information in BioMedicine, School of Life Science and Technology, University of Electronic Science and Technology of China Chengdu, China.
authors.forename: Mingming
authors.initials: M
authors.lastname: Chen
authors.affiliation: Key Laboratory for NeuroInformation of Ministry of Education, Center for Information in BioMedicine, School of Life Science and Technology, University of Electronic Science and Technology of China Chengdu, China.
authors.forename: Miaomiao
authors.initials: M
authors.lastname: Xue
authors.affiliation: Key Laboratory for NeuroInformation of Ministry of Education, Center for Information in BioMedicine, School of Life Science and Technology, University of Electronic Science and Technology of China Chengdu, China.
authors.forename: Daqing
authors.initials: D
authors.lastname: Guo
authors.affiliation: Key Laboratory for NeuroInformation of Ministry of Education, Center for Information in BioMedicine, School of Life Science and Technology, University of Electronic Science and Technology of China Chengdu, China.
authors.forename: Dezhong
authors.initials: D
authors.lastname: Yao
authors.affiliation: Key Laboratory for NeuroInformation of Ministry of Education, Center for Information in BioMedicine, School of Life Science and Technology, University of Electronic Science and Technology of China Chengdu, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Xia
keywords: REM sleep; SWS; factor analysis; frequency band; power spectra; rat; wakeful rest