title: Fluctuations observed in biological time series signals and their functional significance.
abstract: Fluctuation phenomena in a single neuronal spike train of a cat were investigated during sleep states. Although white-noise-like fluctuations were observed during non-REM sleep, they became 1/f fluctuations during REM sleep. REM sleep is regarded as a reversion to a state of the fetal brain. The functional significance of 1/f fluctuations in biological time series signals is discussed from the viewpoint of homeostasis.
authors.affiliation: Department of Information Engineering, Faculty of Engineering, Tohoku University, Sendai, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Yamamoto
mesh_terms: D000204:Activity Cycles / Q000502:physiology*; D000818:Animals; D001933:Brain Stem / Q000502:physiology; D002415:Cats; D006339:Heart Rate / Q000502:physiology; D009415:Nerve Net / Q000502:physiology; D012701:Serotonin / Q000502:physiology; D012895:Sleep, REM / Q000502:physiology*
chemical_list: D012701:Serotonin