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Updated: Jun 9, 2026
08:58
Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice
Published on: June 19, 2019
Hypothalamic versus neocortical control of sleep.
1Research Service, VA Greater Los Angeles Healthcare System, 16111 Plummer Street, North Hills, Los Angeles, CA 91343, USA. rszym@ucla.edu
Current Opinion in Pulmonary Medicine
|August 27, 2010
Summary
Brain regions most active during wakefulness show increased sleep intensity later. This suggests local sleep regulation in the cortex, challenging older theories of global brainstem control over sleep homeostasis.
Area of Science:
- Neuroscience
- Sleep Science
- Cognitive Neuroscience
Background:
- Established theories propose global control of sleep homeostasis via brainstem and hypothalamus.
- Ascending arousal systems originating in the brainstem and hypothalamus are thought to regulate overall neocortical activity during sleep.
Purpose of the Study:
- To explore the novel concept of local sleep regulation within the neocortex.
- To investigate how neocortical activity during waking influences subsequent sleep intensity.
Main Methods:
- Review of animal and human experiments examining neocortical electroencephalogram (EEG) slow-wave activity (SWA).
- Analysis of studies measuring functional activity, gene expression, and neuromodulator levels in the neocortex.
Main Results:
- Neocortical regions with higher waking activity exhibit increased EEG SWA, a marker of sleep need.
- Use-dependent increases in EEG SWA, evoked potentials, plasticity genes, and sleep-regulatory molecules observed in the neocortex.
- Hypothesized functional consequences include regulation of synaptic plasticity, homeostasis, and energy balance.
Conclusions:
- Evidence supports use-dependent modulation of neocortical activity influencing sleep.
- Local neocortical changes occur within a broader context of global sleep patterns.
- Further research is needed to understand the global impact of cortical events and their interaction with hypothalamic sleep control mechanisms.
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