This chapter will review the highly irregular and seemingly noisy neuronal activity during different brain states, such as wake and sleep states, as well as different types of anesthesia. During these states, intracellular recordings in cortical neurons in vivo show a very intense and noisy synaptic activity, also called synaptic noise. The properties of synaptic noise are reviewed, in particular the quantitative measurements of its large conductance (high-conductance states).
KeywordsPower Spectral Density Input Resistance Intracellular Recording Intracellular Activity Awake Animal
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