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2015 ; 38
(1
): 85-96
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Characterization of topographically specific sleep spindles in mice
#MMPMID25325451
Kim D
; Hwang E
; Lee M
; Sung H
; Choi JH
Sleep
2015[Jan]; 38
(1
): 85-96
PMID25325451
show ga
STUDY OBJECTIVE: Sleep spindles in humans have been classified as slow anterior
and fast posterior spindles; recent findings indicate that their profiles differ
according to pharmacology, pathology, and function. However, little is known
about the generation mechanisms within the thalamocortical system for different
types of spindles. In this study, we aim to investigate the electrophysiological
behaviors of the topographically distinctive spindles within the thalamocortical
system by applying high-density EEG and simultaneous thalamic LFP recordings in
mice. DESIGN: 32-channel extracranial EEG and 2-channel thalamic LFP were
recorded simultaneously in freely behaving mice to acquire spindles during
spontaneous sleep. SUBJECTS: Hybrid F1 male mice of C57BL/6J and 129S4/svJae.
MEASUREMENTS AND RESULTS: Spindle events in each channel were detected by spindle
detection algorithm, and then a cluster analysis was applied to classify the
topographically distinctive spindles. All sleep spindles were successfully
classified into 3 groups: anterior, posterior, and global spindles. Each spindle
type showed distinct thalamocortical activity patterns regarding the extent of
similarity, phase synchrony, and time lags between cortical and thalamic areas
during spindle oscillation. We also found that sleep slow waves were likely to
associate with all types of sleep spindles, but also that the ongoing cortical
decruitment/ recruitment dynamics before the onset of spindles and their
relationship with spindle generation were also variable, depending on the spindle
types. CONCLUSION: Topographically specific sleep spindles show distinctive
thalamocortical network behaviors.