Journal article
State-dependent effects of light-dark cycle on somatosensory and visual cortex EEG in rats
American journal of physiology. Regulatory, integrative and comparative physiology, Vol.289(4), pp.R1083-1089
10/2005
Handle:
https://hdl.handle.net/2376/109398
PMID: 16183627
Abstract
Somatosensory (SSctx) and visual cortex (Vctx) EEG were evaluated in rats under a 12:12-h light-dark (LD) cycle and under constant light (LL) or constant dark (DD) in each sleep or wake state. Under LD conditions during light period, relative Vctx EEG slow-wave activity (SWA) was higher than that of the SSctx, whereas during dark period, relative Vctx EEG SWA was lower than in the SSctx. These effects were state specific, occurring only during non-rapid eye movement sleep (NREMS). Under LL conditions, the duration of REMS and NREMS during the period that would have been dark if the LD cycle had continued (subjective dark period) was greater than under LD conditions. DD conditions had little effect on the duration of NREMS and REMS. SSctx and Vctx EEG SWA were suppressed by LL during the subjective dark period; however, the degree of Vctx SWA suppression was smaller than that of the SSctx. DD conditions during the subjective light period enhanced SSctx SWA, whereas Vctx SWA was suppressed. Under LL conditions during the subjective dark period, Vctx EEG power was higher than that of the SSctx across a broad frequency range during NREMS, REMS, and wakefulness. During DD, SSctx EEG power during NREMS was higher than that of the Vctx in the delta wave band, whereas SSctx power during REMS and wakefulness was higher than that of the Vctx in frequencies higher than 8 Hz. We concluded that the SSctx and Vctx EEGs are differentially affected by light during subsequent sleep. Results provide support for the notion that regional sleep intensity is dependent on prior regional afferent input.
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Details
- Title
- State-dependent effects of light-dark cycle on somatosensory and visual cortex EEG in rats
- Creators
- Tadanobu Yasuda - Department of Veterinary and Comparative Anatomy, Pharmacology and Physiology, College of Veterinary Medicine, Washington State University, PO Box 646520, Pullman, WA 99164-6520, USAKyo YasudaRichard A BrownJames M Krueger
- Publication Details
- American journal of physiology. Regulatory, integrative and comparative physiology, Vol.289(4), pp.R1083-1089
- Academic Unit
- Integrative Physiology and Neuroscience, Department of
- Publisher
- United States
- Grant note
- NS-25378 / NINDS NIH HHS NS-31453 / NINDS NIH HHS
- Identifiers
- 99900547013401842
- Language
- English
- Resource Type
- Journal article