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• W2803399562 abstract "An important unresolved question about neural processing is the mechanism by which distant brain areas coordinate their activities and relate their local processing to global neural events. A potential candidate for the local-global integration are slow rhythms such as respiration. In this study, we asked if there are modulations of local cortical processing that are phase-locked to (peripheral) sensory-motor exploratory rhythms. We studied rats on an elevated platform where they would spontaneously display exploratory and rest behaviors. Concurrent with behavior, we monitored whisking through electromyography and the respiratory rhythm from the olfactory bulb (OB) local field potential (LFP). We also recorded LFPs from dorsal hippocampus, primary motor cortex, primary somatosensory cortex, and primary visual cortex. We defined exploration as simultaneous whisking and sniffing above 5 Hz and found that this activity peaked at ~8 Hz. We considered rest as the absence of whisking and sniffing, and in this case, respiration occurred at ~3 Hz. We found a consistent shift across all areas toward these rhythm peaks accompanying behavioral changes. We also found, across areas, that LFP gamma (70–100 Hz) amplitude could phase-lock to the animal’s OB respiratory rhythm, a finding indicative of respiration-locked changes in local processing. In a subset of animals, we also recorded the hippocampal theta activity and found that occurred at frequencies overlapped with respiration but was not spectrally coherent with it, suggesting a different oscillator. Our results are consistent with the notion of respiration as a binder or integrator of activity between brain regions. NEW & NOTEWORTHY In freely behaving rats, we found that local cortical activity within distant brain areas can phase-lock to the respiratory rhythm, more prominently during exploratory behavior than during basal respiration conditions. The findings suggest that the respiration rhythm can provide a common neural clock to integrate activity across brain areas. Our methodology also shows that the animal’s internal rhythms can be used as a reference time frame to analyze physiological activity in free behavior conditions." @default.
• W2803399562 created "2018-06-01" @default.
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• W2803399562 date "2018-09-01" @default.
• W2803399562 modified "2023-09-30" @default.
• W2803399562 title "Local cortical activity of distant brain areas can phase-lock to the olfactory bulb’s respiratory rhythm in the freely behaving rat" @default.
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• W2803399562 doi "https://doi.org/10.1152/jn.00088.2018" @default.
• W2803399562 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29766764" @default.
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