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Investigating Sleep Homeostasis with Extracellular Recording of Multiunit Activity from the Neocortex in Freely Behaving Rats

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Neuronal Network Analysis

Part of the book series: Neuromethods ((NM,volume 67))

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Abstract

Cortical activity during sleep and waking is traditionally investigated with electroencephalography (EEG). The most distinctive feature of neocortical activity during sleep is the occurrence of EEG slow waves, arising from quasi-synchronous periods of activity and silence among cortical neurons. The EEG slow waves are regulated homeostatically: they are larger and have a higher incidence following long waking periods and decrease as a function of time spent asleep. Since intense early sleep seems to be important for restoration, understanding the cellular mechanisms underlying homeostatic regulation of sleep slow waves may appear crucial for understanding sleep function. While macrooscillations recorded with the EEG arise from synchronous activity and silence of large populations of cortical neurons, at present intracellular recording techniques do not allow monitoring the state of more than just a few cells at a time across spontaneous sleep–wake cycle in unrestrained animals. Here, we review a method for chronic recording of extracellular LFP and multiunit activity from the neocortex in freely moving rats. This technique is most useful for addressing cellular mechanisms of sleep homeostasis because it allows monitoring the activity of many cells simultaneously for many hours. The description of the surgical procedure is complemented with a detailed account of spike sorting, which is a crucial step in processing and interpreting extracellular waveforms.

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Authors and Affiliations

  1. Department of Psychiatry, University of Wisconsin-Madison, Madison, WI, USA

    Vladyslav V. Vyazovskiy & Giulio Tononi

  2. PERCRO Laboratory, Scuola Superiore Sant’Anna, Istituto Italiano di Tecnologia, Pisa, Italy

    Umberto Olcese

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  1. Vladyslav V. Vyazovskiy
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  2. Umberto Olcese
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  3. Giulio Tononi
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Editors and Affiliations

  1. , Dpt. Neuroscience & Brain Technologies, Istituto Italiano di Tecnologia (IIT), Via Morego 30, Genova, 16163, Italy

    Tommaso Fellin

  2. , Department of Psychiatry, Massachusetts General Hospital, Fruit St. 55, Boston, 02114, Massachusetts, USA

    Michael Halassa

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Vyazovskiy, V.V., Olcese, U., Tononi, G. (2011). Investigating Sleep Homeostasis with Extracellular Recording of Multiunit Activity from the Neocortex in Freely Behaving Rats. In: Fellin, T., Halassa, M. (eds) Neuronal Network Analysis. Neuromethods, vol 67. Humana Press. https://doi.org/10.1007/7657_2011_22

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  • DOI: https://doi.org/10.1007/7657_2011_22

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  • Publisher Name: Humana Press

  • Print ISBN: 978-1-61779-632-6

  • Online ISBN: 978-1-61779-633-3

  • eBook Packages: Springer Protocols

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