Inter-hemispheric coherence of neocortical gamma oscillations during sleep and wakefulness

Castro, Santiago; Cavelli, Matías; Vollono, Patricia; Chase, Michael H.; Falconi, Atilio; Torterolo, Pablo

doi:10.1016/j.neulet.2014.06.044

Cited by 26 publications

(29 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1A, arrows); it has been established that during W (mainly during alert W), gamma activity has high degree of coherence between different cortices [20,26]. During naturally-occurring REM sleep, the EEG activation (without coherent gamma activity [20,26]), PGO waves in the LGN electrogram (Fig. 1B, arrowheads) and muscle atonia were evident.…”

Section: Behavioral States Induced By Carbacholmentioning

confidence: 89%

“…Selected 300-500 s periods of the tachogram and the RA, that were recorded simultaneously, were analyzed by means of the magnitude squared coherence using the Spike-2 ® script COHER 1S [18,20,26]. The period of analysis was divided into 32 time-blocks at sampling rate of 16.4 Hz with a bin size of 512 samples and a resolution of 0.016 Hz (bin size includes samples of both waveforms channels that were simultaneously recorded).…”

Section: Sleep and Hrv Analysesmentioning

confidence: 99%

See 1 more Smart Citation

Heart rate variability during carbachol-induced REM sleep and cataplexy

Torterolo

Castro-Zaballa

Cavelli

et al. 2015

Behavioural Brain Research

Self Cite

View full text Add to dashboard Cite

Section: Behavioral States Induced By Carbacholmentioning

confidence: 89%

Section: Sleep and Hrv Analysesmentioning

confidence: 99%

Heart rate variability during carbachol-induced REM sleep and cataplexy

Torterolo

Castro-Zaballa

Cavelli

et al. 2015

Behavioural Brain Research

Self Cite

View full text Add to dashboard Cite

“…The choice of monopolar EEG recordings was based on previously published animal studies [19][20][21] and on a study from our laboratory demonstrating that monopolar reference is best suited to detect genuine EEG phase synchronization. 22 Electroencephalographic signals were amplified (×5000)…”

Section: Electroencephalographic Data Acquisitionmentioning

confidence: 99%

Electroencephalographic coherence and cortical acetylcholine during ketamine-induced unconsciousness

Pal

Hambrecht-Wiedbusch

Silverstein

et al. 2015

British Journal of Anaesthesia

View full text Add to dashboard Cite

Background: There is limited understanding of cortical neurochemistry and cortical connectivity during ketamine anaesthesia. We conducted a systematic study to investigate the effects of ketamine on cortical acetylcholine (ACh) and electroencephalographic coherence. Methods: Male Sprague-Dawley rats (n=11) were implanted with electrodes to record electroencephalogram (EEG) from frontal, parietal, and occipital cortices, and with a microdialysis guide cannula for simultaneous measurement of ACh concentrations in prefrontal cortex before, during, and after ketamine anaesthesia. Coherence and power spectral density computed from the EEG, and ACh concentrations, were compared between conscious and unconscious states. Loss of righting reflex was used as a surrogate for unconsciousness. Results: Ketamine-induced unconsciousness was associated with a global reduction of power (P=0.02) in higher gamma bandwidths (>65 Hz), a global reduction of coherence (P≤0.01) across a broad frequency range (0.5-250 Hz), and a significant increase in ACh concentrations (P=0.01) in the prefrontal cortex. Compared with the unconscious state, recovery of righting reflex was marked by a further increase in ACh concentrations (P=0.0007), global increases in power in theta (4-10 Hz; P=0.03) and low gamma frequencies (25-55 Hz; P=0.0001), and increase in power (P≤0.01) and coherence (P≤0.002) in higher gamma frequencies (65-250 Hz). Acetylcholine concentrations, coherence, and spectral properties returned to baseline levels after a prolonged recovery period. Conclusions: Ketamine-induced unconsciousness is characterized by suppression of high-frequency gamma activity and a breakdown of cortical coherence, despite increased cholinergic tone in the cortex.

show abstract

“…It has been observed for example, that fast wave oscillations in neuron assemblies in one part of the brain sometimes co-vary with fast wave oscillations more distant parts of the brain (Burgess & Ali, 2002; Castro et al, 2014; Zhang, Gan, & Wang, 2014). The physiological and functional implications of these observations and their significance are not yet clear.…”

Section: Measuring Brain Activity With Electroencephalogrammentioning

confidence: 99%

Brain Oscillations, Hypnosis, and Hypnotizability

Jensen

Adachi

Hakimian

2015

American Journal of Clinical Hypnosis

View full text Add to dashboard Cite

In this article, we summarize the state-of-science knowledge regarding the associations between hypnosis and brain oscillations. Brain oscillations represent the combined electrical activity of neuronal assemblies, and are usually measured as specific frequencies representing slower (delta, theta, alpha) and faster (beta, gamma) oscillations. Hypnosis has been most closely linked to power in the theta band and changes in gamma activity. These oscillations are thought to play a critical role in both the recording and recall of declarative memory and emotional limbic circuits. Here we propose that it is this role that may be the mechanistic link between theta (and perhaps gamma) oscillations and hypnosis; specifically that theta oscillations may facilitate, and that changes in gamma activity observed with hypnosis may underlie, some hypnotic responses. If these hypotheses are supported, they have important implications for both understanding the effects of hypnosis, and for enhancing response to hypnotic treatments.

show abstract

Inter-hemispheric coherence of neocortical gamma oscillations during sleep and wakefulness

Cited by 26 publications

References 29 publications

Heart rate variability during carbachol-induced REM sleep and cataplexy

Heart rate variability during carbachol-induced REM sleep and cataplexy

Electroencephalographic coherence and cortical acetylcholine during ketamine-induced unconsciousness

Brain Oscillations, Hypnosis, and Hypnotizability

Contact Info

Product

Resources

About