Hippocampal gamma‐slow oscillation coupling in macaques during sedation and sleep
| Autor: | Sandhitsu R. Das, Jan Van der Spiegel, Timothy H. Lucas, Max B. Kelz, Andrew G. Richardson, Eric Hudgins, Xilin Liu, Joel M. Stein, Milin Zhang, Pauline K. Weigand, Alex Proekt |
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| Rok vydání: | 2017 |
| Předmět: |
Male
0301 basic medicine Rhythmic excitation Cognitive Neuroscience Sedation Hippocampus Hippocampal formation Article 03 medical and health sciences 0302 clinical medicine medicine Animals Gamma Rhythm Hypnotics and Sedatives Ketamine Signal Processing Computer-Assisted Macaca mulatta Sleep in non-human animals Electric Stimulation Electrodes Implanted 030104 developmental biology medicine.anatomical_structure Synapses Anesthetic Parahippocampal Gyrus medicine.symptom Sleep Psychology Neuroscience Dexmedetomidine 030217 neurology & neurosurgery Parahippocampal gyrus medicine.drug |
| Zdroj: | Hippocampus. 27:1125-1139 |
| ISSN: | 1098-1063 1050-9631 |
| DOI: | 10.1002/hipo.22757 |
| Popis: | Behavioral and neurophysiological evidence suggests that the slow (≤ 1 Hz) oscillation (SO) during sleep plays a role in consolidating hippocampal (HIPP)-dependent memories. The effects of the SO on HIPP activity have been studied in rodents and cats both during natural sleep and during anesthetic administration titrated to mimic sleep-like slow rhythms. In this study, we sought to document these effects in primates. First, HIPP field potentials were recorded during ketamine-dexmedetomidine sedation and during natural sleep in three rhesus macaques. Sedation produced regionally-specific slow and gamma (~40 Hz) oscillations with strong coupling between the SO phase and gamma amplitude. These same features were seen in slow-wave sleep (SWS), but the coupling was weaker and the coupled gamma oscillation had a higher frequency (~70 Hz) during SWS. Second, electrical stimuli were delivered to HIPP afferents in the parahippocampal gyrus (PHG) during sedation to assess the effects of sleep-like SO on excitability. Gamma bursts after the peak of SO cycles corresponded to periods of increased gain of monosynaptic connections between the PHG and HIPP. However, the two PHG-HIPP connectivity gains during sedation were both substantially lower than when the animal was awake. We conclude that the SO is correlated with rhythmic excitation and inhibition of the PHG-HIPP network, modulating connectivity and gamma generators intrinsic to this network. Ketamine-dexmedetomidine sedation produces a similar effect, but with a decreased contribution of the PHG to HIPP activity and gamma generation. |
| Databáze: | OpenAIRE |
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