نتایج جستجو برای: field gamma

تعداد نتایج: 902353  

Journal: :Neuron 2013
Xiaoxuan Jia Seiji Tanabe Adam Kohn

Gamma components of the local field potential (LFP) are elevated during cognitive and perceptual processes. It has been suggested that gamma power indicates the strength of neuronal population synchrony, which influences the relaying of signals between cortical areas. However, the relationship between coordinated spiking activity and gamma remains unclear, and the influence on corticocortical s...

Journal: :Neuron 2013
Martin Vinck Thilo Womelsdorf Elizabeth A. Buffalo Robert Desimone Pascal Fries

Selective visual attention is subserved by selective neuronal synchronization, entailing precise orchestration among excitatory and inhibitory cells. We tentatively identified these as broad (BS) and narrow spiking (NS) cells and analyzed their synchronization to the local field potential in two macaque monkeys performing a selective visual attention task. Across cells, gamma phases scattered w...

Journal: :The Astrophysical journal 2000
Lazzati Ghisellini Celotti Rees

It is proposed that the gamma-ray photons that characterize the prompt emission of gamma-ray bursts are produced through the Compton-drag process, which is caused by the interaction of a relativistic fireball with a very dense soft photon bath. If gamma-ray bursts are indeed associated with supernovae, then the exploding star can provide enough soft photons for radiative drag to be effective. T...

2016
Quentin Perrenoud Cyriel M. A. Pennartz Luc J. Gentet Alberto Bacci

Cortical gamma activity (30-80 Hz) is believed to play important functions in neural computation and arises from the interplay of parvalbumin-expressing interneurons (PV) and pyramidal cells (PYRs). However, the subthreshold dynamics underlying its emergence in the cortex of awake animals remain unclear. Here, we characterized the intracellular dynamics of PVs and PYRs during spontaneous and vi...

2008
Rebecca M. Howell Iris P. N. Smith Christie S. Jarrio

Although portal dosimetry is used to provide quality assurance (QA) for intensity-modulated radiation therapy (IMRT) treatment plans, trends in agreement between the portal dose prediction (PDP) and the measured dose have not been clarified. In this work, we evaluated three scalar parameters of agreement for 152 treatment plans (1152 treatment fields): maximum gamma (gamma max), average gamma (...

2009
Andrei T Popescu Daniela Popa Denis Paré

The basolateral amygdala (BLA) mediates the facilitating effects of emotions on memory. The BLA’s enhancing influence extends to various types of memories, including striatal-dependent habit formation. To shed light on the underlying mechanisms, we carried out unit and local field potential (LFP) recordings in BLA, striatum, auditory cortex and intralaminar thalamus in cats trained on a stimulu...

Journal: :The Journal of neuroscience : the official journal of the Society for Neuroscience 2003
Derek L Buhl Kenneth D Harris Sheriar G Hormuzdi Hanna Monyer György Buzsáki

The physiological roles of neuronal gap junctions in the intact brain are not known. The recent generation of the connexin-36 knock-out (Cx36 KO) mouse has offered a unique opportunity to examine this problem. Recent in vitro recordings in Cx36 KO mice suggested that Cx36 gap junction contributes to various oscillatory patterns in the theta (approximately 5-10 Hz) and gamma (approximately 30-80...

2000
F. Frontera L. A. Antonelli L. Amati E. Montanari E. Costa D. Dal Fiume P. Giommi M. Feroci G. Gennaro J. Heise N. Masetti J. M. Muller L. Nicastro M. Orlandini E. Palazzi E. Pian L. Piro P. Soffitta S. Stornelli J. J. M. in ’ t Zand D. A. Frail S. R. Kulkarni M. Vietri

We discuss observations of the prompt X– and γ–ray emission and X–ray afterglow from GRB981226. This event has the weakest gamma-ray peak flux detected with the BeppoSAX Gamma-Ray Burst Monitor. It shows an isolated X-ray precursor and the highest X-ray to gamma-ray fluence ratio measured thus far with the BeppoSAX Wide Field Cameras. The event was followed up with the BeppoSAX Narrow Field Ins...

1997
T. M. Kneiske D. H. Hartmann

Bearing on the model for the time-dependent metagalactic radiation field developed in the first paper of this series, we compute the gamma-ray attenuation due to pair production in photon-photon scattering. Emphasis is on the effects of varying the star formation rate and the fraction of UV radiation assumed to escape from the star forming regions, the latter being important mainly for high-red...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید باهنر کرمان 1390

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