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2016 ; 11
(3
): e0151369
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Synchronization and Propagation of Global Sleep Spindles
#MMPMID26963102
PLoS One
2016[]; 11
(3
): e0151369
PMID26963102
show ga
Sleep spindles occur thousands of times during normal sleep and can be easily
detected by visual inspection of EEG signals. These characteristics make spindles
one of the most studied EEG structures in mammalian sleep. In this work we
considered global spindles, which are spindles that are observed simultaneously
in all EEG channels. We propose a methodology that investigates both the signal
envelope and phase/frequency of each global spindle. By analysing the global
spindle phase we showed that 90% of spindles synchronize with an average latency
time of 0.1 s. We also measured the frequency modulation (chirp) of global
spindles and found that global spindle chirp and synchronization are not
correlated. By investigating the signal envelopes and implementing a homogeneous
and isotropic propagation model, we could estimate both the signal origin and
velocity in global spindles. Our results indicate that this simple and
non-invasive approach could determine with reasonable precision the spindle
origin, and allowed us to estimate a signal speed of 0.12 m/s. Finally, we
consider whether synchronization might be useful as a non-invasive diagnostic
tool.
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