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Статті в журналах з теми "Rythmes thêta"
GASTAUT, H., P. SANTANELLI, and M. SALINASJARA. "Une activite EEG intercritique specifique d'une variete particuliere d'epilepsie temporale. Le rythme theta temporal epileptique." Revue d&'apos;Electroencéphalographie et de Neurophysiologie Clinique 15, no. 2 (September 1985): 113–20. http://dx.doi.org/10.1016/s0370-4475(85)80015-0.
Повний текст джерела"Les stimulations operatoires augmentent l'activite cerebrale des rythmes delta et theta chez des patients anesthesies au protoxyde d'azote/isoflurane. une analyse quantitative et topographique." Annales Françaises d'Anesthésie et de Réanimation 11 (January 1992): R137. http://dx.doi.org/10.1016/s0750-7658(05)81946-x.
Повний текст джерела"Erratum:テトリスゲーム課題遂行におけるFrontal midline theta rythmの出現特徴について[日本心理学会第74回大会1PM059]". Proceedings of the Annual Convention of the Japanese Psychological Association 74 (2010): E_1PM059. http://dx.doi.org/10.4992/pacjpa.74.0_e_1pm059.
Повний текст джерелаДисертації з теми "Rythmes thêta"
Guerreiro, Inês. "Cholinergic and multiple-circuit mechanisms of hippocampal theta-rhythm generation." Electronic Thesis or Diss., Université Paris sciences et lettres, 2021. http://www.theses.fr/2021UPSLE074.
Повний текст джерелаHippocampal theta oscillations are a prominent 4-12 Hz rhythm observed in the hippocampal local field potential and its associated structures of all mammals. Besides the hippocampus, two other brain structures are known to be essential for in vivo hippocampal theta generation - the medial septum (MS) and entorhinal cortex (EC). However, after decades of research, the mechanisms through which these oscillations arise remain elusive. In this thesis, we address the role that each of the three mentioned brain regions (MS, EC and hippocampus) play in the generation and maintenance of theta oscillations. In the first part of the dissertation, we study how septal cholinergic inputs acting on hippocampal GABAergic interneurons through α7 nicotinic receptors regulate the excitability and plasticity of the hippocampus. In the second part, we investigate the circuit mechanisms that enable the generation of theta oscillations in the EC and the propagation of the rhythmic activity to the hippocampus. To this aim, we start by studying how the connectivity of the entorhinal cortex network made of stellate cells, pyramidal cells and fast-spiking interneurons modulates the circuit's response to hippocampal excitatory inputs. Next, we address how entorhinal oscillatory inputs onto a hippocampal network of OLM cells, fast-spiking interneurons and pyramidal cells can drive the system into a theta resonant state. In summary, we propose a multi-circuit mechanism for the generation of theta oscillations in a septal-hippocampalentorhinal network, where the three brain regions play an active role in the induction and expression of the theta rhythm. Cholinergic inputs regulate hippocampal excitability, which acts as a gate that permits theta oscillations to arise in the EC circuit and spread to the hippocampus, thus closing the entorhinal-hippocampal loop
Zugaro, Michaël. "Rythmes cérébraux et codage neural de la mémoire." Habilitation à diriger des recherches, Université Pierre et Marie Curie - Paris VI, 2009. http://tel.archives-ouvertes.fr/tel-00599428.
Повний текст джерелаGastrein, Philippe [Verfasser], Reiner [Akademischer Betreuer] Kree, Nicole [Akademischer Betreuer] Ropert, and Jan [Akademischer Betreuer] Behrends. "Courant H et rythmes thêta dans les structures corticales : Un exemple du rôle des courants intrinsèques dans l'organisation temporelle de l'activité de reseau [[Elektronische Ressource]] = H-Strom und kortikale Theta-Rhythmen / Philippe Gastrein. Gutachter: Nicole Ropert ; Jan Behrends. Betreuer: Reiner Kree." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2007. http://d-nb.info/1042779929/34.
Повний текст джерелаAllerborn, Marina. "Recent and remote episodic-like memory : characteristics and circuits : approach via multi-site recordings of oscillatory activity in rat hippocampal and cortical brain regions." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1207.
Повний текст джерелаEpisodic memory, our capacity to recollect particular life episodes, has been initially defined in terms of the information it contains, what kind of event, where and in which context/when did it take place. Pioneering studies on food-caching birds have demonstrated that animals are also able to form such complex memories, referred to as episodic-like memories in animals, however its modelling in rodents has proved challenging. The aim of this thesis was twofold: further development and validation in rats of a new episodic-like memory paradigm and study of neural circuits involved in formation and retrieval of this particular memory. The first part of the thesis presents the original behavioral paradigm developed in our group. In our task we tried to minimize training procedure in order to preserve the nature of episodic memory which is the memory for unique life episodes. Hereby rats were exposed to two different episodes, during which unique odor-place combinations (“what and where” information) were presented in different enriched multisensory contexts (“in which context” information). We found that some rats (“ww” group) were indeed able to form episodic-like memory associations which can be recalled after short (24 h) and long delays (24 days) in different experimental situations, while other animals (“rest” group) remembered only parts of the information contained in the initial episodes. Using pharmacological inactivation of dorsal hippocampus we have demonstrated that hippocampus is required specifically for retrieval of associated episodic-like memory information, but not for retrieval of single elements of the presented episodes in our task. In an extended version of the protocol in which rats were exposed to two additional episodes we found that previously acquired experience of the rats facilitates the encoding of new episodes and that the memory of these new episodes is more stable. The second part of the manuscript presents the first approach to study neural circuits involved in episodic-like memory encoding and retrieval in our task. Electrophysiological methodology was based on local field potential recordings obtained in parallel in several brain regions in behaving animals. The network of structures investigated included olfactory neocortical brain areas, brain regions in lateral and medial prefrontal cortex and the dorsal and ventral part of the hippocampus. The analysis was based on the estimation of magnitude of the oscillatory activity (described as power changes) in theta and beta frequency bands using Hilbert and Morlet wavelet transform for the analyses. The power analysis evolved around odor sampling event which constituted the last piece of information required for recollection of the whole episodic-like memory association. The odor-induced changes in power were compared between “ww” and “rest” animals in different experimental situations. We found that the network of activated brain regions in beta frequency band differed as a function of the memory profile of the rats (complete episodic-like memory recollection versus remembering partial information of the episodes) during both memory encoding as well as retrieval. We have also demonstrated that this active network changes when memory becomes consolidated (recent versus remote memory). Additionally we have shown that the activity in the network depends on the type of the response (hit versus correct rejection) given by the rat during memory encoding and retrieval. The network of brain regions that showed changes in theta power during memory formation and retrieval differed strongly from beta band network. In contrast to beta, the memory profile effect was much less prominent for theta band. However similarly to beta, there were also significant changes in network depending on the encoding session and the age of memory at test
Monmaur, Paul. "Rôle de l'organisation anatomofonctionnelle du système septo-hippocampique dans l'apparition et le maintien du rythme theta." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb375997601.
Повний текст джерелаChauviere, Laëtitia. "Déficits cognitifs et altération de l'activité de réseau au cours de l'épileptogenèse dans un modèle expérimental d'épilepsie du lobe temporal." Thesis, Aix-Marseille 2, 2010. http://www.theses.fr/2010AIX20662/document.
Повний текст джерелаTemporal lobe epilepsy (TLE) is the most common form of partial epilepsy in adults. TLE is characterized by a latent period during which TLE takes place. This period is called epileptogenesis. In TLE patients, epileptogenesis is unexplored. However, the use of animal models, like pilocarpine model, allows the study of epileptogenic processes, in order to try to prevent TLE. Thus, my PhD work tries to yield some predictive markers of epileptogenesis, in the pilocarpine model. We studied cognitive and electrophysiological in vivo alterations in this model. We showed that there are early and persistent spatial deficits that correlate with a decrease of the power of theta oscillations, i.e. during the early stage of epileptogenesis and the chronic stage. At the same time, there is also a decrease of power and frequency of theta rhythm during exploratory behaviors. Interictal-like activity (ILA) is a pathological activity present during epileptogenesis in experimental models. ILA does not correlate with cognitive deficits, but decreases theta power after the spike, i.e. in its wave, during epileptogenesis but not during the chronic stage anymore. This suggests an important network alteration before the chronic stage. Indeed, we described two types of ILA, whose properties (number, amplitude) and dynamics evolved during epileptogenesis with a major switch just before the first spontaneous seizure. All together, these results may constitute, with spatial deficits and theta rhythm alterations, predictive markers of epileptogenesis. Moreover, we showed an increase in the coupling, ILA-dependent, between the hippocampus and the entorhinal cortex, during epileptogenesis but not during the chronic stage, whereas a reversal of the information flow between these two structures occurs at the early stage of epileptogenesis and persists without any modification till the chronic stage. These results suggest the build-up of an epileptogenic network, a major switch of network properties just before the first spontaneous seizure, and some markers that could be predictive of epileptogenesis. TLE, oscillations and cognition involved processes at the network level, in particular synchronization processes. These processes could be possible via oscillations, which allow information transfer between structures of the network, in order to provide behavioral and cognitive processing. Recordings performed in 15 different structures of the temporal lobe showed, in pilocarpine animals, a network with more “small-world” (SW) features, with a higher local clustering and a loss of long-range connections. These results could explain cognitive and oscillatory alterations observed previously during epileptogenesis. SW and coherence analysis, at the network level, between signals during different brain-states (behaviors and cognitive processes) showed changes in dynamics occurring during these states, in normal and epileptogenic conditions. All these modifications in network activities may be involved in the construction of an epileptic brain and in associated cognitive deficits
Bergel, Antoine. "Cerebral vascular patterns associated with theta and gamma rhythms during unrestrained behavior and REM sleep." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC239/document.
Повний текст джерелаTheta rhythm is a prominent oscillatory pattern of EEG strongly associated with active locomotion and REM sleep. While it has been shown to play a crucial role in communication between brain areas and memory processes, there is a lack of extensive data due to the difficulty to image global brain activity during locomotion behavior. In this thesis, I developed an approach that combines local field potential recordings (LFP) and functional ultrasound imaging (fUS) to unrestrained rats. For the first time, I could image the hemodynamic responses associated with theta rhythm in most central nervous system (CNS) structures, with high spatial (100 x 100 x 400 μm) and temporal (200 ms) resolutions. During running and REM sleep, hemodynamic variations in the hippocampus, dorsal thalamus and cortices (S1BF, retrosplenial) correlated strongly with instantaneous theta power, with a delay ranging from 0.7 to 2.0 s after theta peak. Interestingly, mid (55-95 Hz) and high gamma (100-150 Hz) instantaneous power better explained hemodynamic variations than mere theta activity, while low-gamma (30-50 Hz) did not. Hippocampal hyperaemia followed sequentially the trisynaptic circuit (dentate gyrus - CA3 region - CA1 region) and was considerably strengthened as the task progressed. REM sleep revealed brain-wide tonic hyperaemia, together with phasic high-amplitude vascular activation starting in the dorsal thalamus and fading in cortical areas, which we referred to as “vascular surges”. Strong bursts of hippocampal high gamma (100-150 Hz) robustly preceded these surges, while the opposite was not true. Taken together, these results reveals the spatio-temporal dynamics of hemodynamics associated with locomotion and REM sleep and suggest a strong link between theta, high-gamma rhythms and brain-wide vascular activity
Villette, Vincent. "Atteintes fonctionnelles de la voie septo-hippocampique associées à une pathologie amyloïde hippocampique chez le rat." Paris 5, 2010. http://www.theses.fr/2010PA05T038.
Повний текст джерелаEpisodic memory, early affected during Alzheimer disease, is sustain by hippocampal network. The hippocampal theta rhythm implicated in mnesic processes is partly generated by medial septum. Using a non transgenic model of amyloid pathology on Rat, we studied how amyloid deposits act on integrity and rhythmicity of the septo-hippocampal network and mnesic processes. We show a progressive decrease on hippocampal theta oscillation power correlated with a mnesic deficits. Data show a correlation between theta oscillation quality and discrimination performance, and also that amyloid injections disturb this organisation. Then, we revealed a decrease firing rate on GABAergic 'pacemaker' rhythmic neurons associate with a decreased in the rhythmic firing neurons proportion balance by slow firing neurons. To finish, we show a selective neuronal loss on GABAergic neurons of the hippocamposeptal pathway
Crouzier, David. "Effets non thermiques des champs de radiofréquences sur le système nerveux central : étude multiparamétrique réalisée sur le rat vigile." Université Joseph Fourier (Grenoble), 2006. http://www.theses.fr/2006GRE10034.
Повний текст джерелаDeleterious effects on healthcare and particularly disruption of the cholinergic system have been reported after exposure to radiofrequency field at low power density. This work present a multiparametric study of freely moving rat where neurophysiology was investigated using a neurochemical (by microdialysis technique), electrophysiological, behavioral (by vigilance stages quantification) and thermophysiological approaches. No neurophysiological effect has been noticed after electromagnetic exposure at 1,8 GHz and 2,45 GHz frequencies and for low power (no thermic level) density. Similarly complementary studies of metabolic and lipidic composition of brain tissue was performed using NMR spectrometry and failed studies by NMR and failed to show any significant effect
Legendre, Arnaud. "Modélisation fonctionnelle de l'activité neuronale hippocampique : Applications pharmacologiques." Thesis, Mulhouse, 2015. http://www.theses.fr/2015MULH7271/document.
Повний текст джерелаThe work of this thesis aims to apply modeling and simulation techniques to mechanisms underlying neuronal activity, in order to promote drug discovery for the treatment of nervous system diseases. The models are developed and integrated at different scales: 1) the so-called "elementary models" permit to simulate dynamics of receptors, ion channels and biochemical reactions in intracellular signaling pathways; 2) models at the neuronal level allow to study the electrophysiological activity of these cells; and 3) microcircuits models help to understand the emergent properties of these complex systems, while maintaining the basic mechanisms that are the targets of pharmaceutical molecules. After a bibliographic synthesis of necessary elements of neurobiology, and an outline of the implemented mathematical and computational tools, the manuscript describes the developed models, as well as their validation process, ranging from the neurotransmitter receptor to the microcircuit. Moreover, these developments have been applied to three studies aiming to understand: 1) pharmacological modulation of the long-term potentiation (LTP) of glutamatergic synapses in the hippocampus, 2) mechanisms of neuronal hyperexcitability in the mesial temporal lobe epilepsy (MTLE), based on in vitro and in vivo experimental results, and 3) cholinergic modulation of hippocampal activity, particularly the theta rhythm associated with septo-hippocampal pathway
Книги з теми "Rythmes thêta"
The one command. Dallas, Tex: Wisdom House, 2007.
Знайти повний текст джерелаOne Command: Six Steps to Attract Wealth with the Power of Your Mind. Penguin Publishing Group, 2012.
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