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	Provedor de dados ArchiMer (1) BJMBR (1) Autor Ballester,G. (1) Branger, H (1) Chapron, Bertrand (1) Elfouhaily, Tanos (1) Fonoff,E.T. (1) Guignard, S (1) Silva,C.P.C. (1) Thompson, D (1) Timo-Iaria,C. (1) Vandemark, D (1) Mais... Palavra-chave Instantaneous frequency (2) AM FM (1) Amplitude modulation frequency modulation (1) Dorsal raphe nucleus (1) Hippocampus (1) Horizontal asymmetry (1) Instantaneous amplitude (1) Mode coupling (1) Neocortex (1) Nonlinear hydrodynamic processes (1) Serotonin (1) Theta rhythm (1) Time frequency distributions (1) Vertical asymmetry (1) Wave wave interaction (1) Wind waves (1) Mais... Tipo do documento Info:eu-repo/semantics/other (1) Text (1) Ano 2003 (1) 1999 (1) País Brazil (1) France (1) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Electro-oscillographic correlation between dorsal raphe nucleus, neocortex and hippocampus during wakefulness before and after serotoninergic inactivation BJMBR Fonoff,E.T.; Silva,C.P.C.; Ballester,G.; Timo-Iaria,C.. Theta rhythm in many brain structures characterizes wakefulness and desynchronized sleep in most subprimate mammalian brains. In close relation to behaviors, theta frequency and voltage undergo a fine modulation which may involve mobilization of dorsal raphe nucleus efferent pathways. In the present study we analyzed frequency modulation (through instantaneous frequency variation) of theta waves occurring in three cortical areas, in hippocampal CA1 and in the dorsal raphe nucleus of Wistar rats during normal wakefulness and after injection of the 5-HT1a receptor agonist 8-OH-DPAT into the dorsal raphe. We demonstrated that in attentive states the variation of theta frequency among the above structures is highly congruent, whereas after 8-OH-DPAT injection,... Tipo: Info:eu-repo/semantics/other Palavras-chave: Theta rhythm; Serotonin; Dorsal raphe nucleus; Neocortex; Hippocampus; Instantaneous frequency. Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000400015 A time-frequency application with the Stokes-Woodward technique ArchiMer Elfouhaily, Tanos; Guignard, S; Branger, H; Thompson, D; Chapron, Bertrand; Vandemark, D. In a recent paper, we have generalized Woodward's theorem and applied it to the case of random signals jointly modulated in amplitude and frequency. This generalization yields a new spectral technique to estimate the amount of energy due to mode coupling without calling for higher order statistics. Two power spectra are detected; the first is related to the independent modes, and the second contains extra energy caused by mode coupling. This detection is now extended from frequency to time-frequency domain. A comparison between a wavelet transform and our time-frequency technique shows good agreement along with new insight into the time occurrence of the nonlinearities or mode coupling. An application to water surface waves is given in this letter as an... Tipo: Text Palavras-chave: Wind waves; Wave wave interaction; Vertical asymmetry; Time frequency distributions; Nonlinear hydrodynamic processes; Mode coupling; Instantaneous frequency; Instantaneous amplitude; Horizontal asymmetry; AM FM; Amplitude modulation frequency modulation. Ano: 2003 URL: https://archimer.ifremer.fr/doc/2003/publication-744.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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