Consulta: subjectFacets:"Theta rhythm"
Registros recuperados: 2
Data/hora: 04/06/2024 18:22:18

Electro-oscillographic correlation between dorsal raphe nucleus, neocortex and hippocampus during wakefulness before and after serotoninergic inactivation
Provedor de dados: 56
Autores: 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

Increased coherence among striatal regions in the theta range during attentive wakefulness
Provedor de dados: 56
Autores: Lepski,G.; Arévalo,A.; Valle,A.C. do; Ballester,G.; Gharabaghi,A.
The striatum, the largest component of the basal ganglia, is usually subdivided into associative, motor and limbic components. However, the electrophysiological interactions between these three subsystems during behavior remain largely unknown. We hypothesized that the striatum might be particularly active during exploratory behavior, which is presumably associated with increased attention. We investigated the modulation of local field potentials (LFPs) in the striatum during attentive wakefulness in freely moving rats. To this end, we implanted microelectrodes into different parts of the striatum of Wistar rats, as well as into the motor, associative and limbic cortices. We then used electromyograms to identify motor activity and analyzed the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Attention; Behavior; Striatum; Theta rhythm; Partial directed coherence.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012000800011