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Phase-response synchronization in neuronal population

Science China(Technological Sciences) 2014年第5期57卷 923-928页

作者： JIAO XianFa ZHU DanFeng School of Mathematics Hefei University of Technology

In this study,we have formulated the phase description of the neuronal oscillator with non-instantaneous synaptic inputs and external periodic stimulus by using the phase sensitivity *** numerical simulation,we have found that the phase of a neuronal oscillator undergoes periodic evolution or locked state,which is determined by the synaptic time *** synaptic time constant is also an important condition under which the global network is *** the synaptic time constant is relatively small,perfectly synchronized behavior quickly occurs in the neuronal *** the synaptic time constant becomes slightly larger,periodic synchronization emerges in the neuronal ***,synchronized activity in the neuronal population is lost for larger synaptic time *** external periodic stimulus can change the synchronization patterns in the neuronal *** a weak low-frequency stimulus,the neuronal populations quick synchronized bursting;whereas a high-frequency stimulus can produce synchronized overlapping *** have also found that neuronal oscillators with type-II phase response curves are more susceptible to synchronization than those with type-I phase response curves.

关键词： neuronal population phase response curve synaptic input external periodic stimulus

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Central mechanisms mediating the prokinetic effect of erythromycin on the gastric motility in rats

Central mechanisms mediating the prokinetic effect of erythr...

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中国神经科学学会第四次会员代表大会暨第八届全国学术会议

作者： Yong-Hua CHEN~1 Han LIU~2 Ji-Jiang WANG~(1 *) 1 Shanghai Medical College of Fudan University Shanghai 200032 2 Zhongshan Hospital Shanghai 200032

＜正＞Erythromycin and its derivatives are increasingly used as prokinetic agents in the treatment of gastrointestinal motility *** on the mechanisms underlying the prokinetic actions of erythromycin mainly focused on the nerve endings in the peripheral nervous system and the gastric muscles *** recent years,studies have shown that central administered erythromycin increases the activities of gastric neurons and stimulates gastric ***, the mechanisms are not known *** neurons are mainly located in the dorsal vagal complex of the *** inputs including GABAergic,glycinergic and glutamatergic components regulate the activities of these *** this study,we identified gastric preganglionic vagal neurons through retrograde fluorescent labeling,and investigated the effect of erythromycin on the synaptic inputs to these neurons using patch-clamp *** found that erythromycin significantly inhibited the glycinergic inhibitory postsynaptic currents in a dose-dependent manner and this inhibition was partially blocked by the motilin receptor antagonist *** contrast,erythromycin didn’t affect the GABAergic inhibitory postsynaptic currents or glutamatergic excitatory postsynaptic *** findings suggest that erythromycin might affect the gastric motility by the inhibition of glycinergic inputs to the gastric preganglionic vagal neurons via activation of motilin *** might be one of the central mechanisms mediating the prokinetic effect of erythromycin.

关键词： erythromycin synaptic input gastric neuron gastric motility

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Modification of spatial frequency tuning induced by stimulation of spectral motion in rat V1

Modification of spatial frequency tuning induced by stimulat...

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中国神经科学学会第四次会员代表大会暨第八届全国学术会议

作者： Cheng CHEN,Hai-Shan YAO~* Laboratory of Visual Neurophysiology,Institute of Neuroscience,Shanghai Institutes for Biological Sciences,Chinese Academy of Sciences,Shanghai 200031,China

＜正＞Spatial frequency（SF） tuning is a fundamental property of primary visual cortical *** study showed that V1 neurons can detect the direction of spectral motion,in which the spatial frequency changes over time either from low to high（LH motion） or from high to low frequency（HL motion）.Motivated by the previous studies in which motion signals are shown to influence the perceived position of object and the position of VI receptive field,here we examine whether SF tuning is influenced by visual stimulation of spectral *** aim to use in vivo whole cell patch recording in rat V1 to study five specific ***,how does spectral motion change the peak position and width of the SF tuning curve? Second,what factors determine the degree of the modification? Third,how long can the modification last? Can a "spaced learning" protocol induce changes that are stable and long-lasting? Fourth,how does the change of excitatory and inhibitory synaptic input account for the plasticity of SF tuning? Fifth,does this plasticity exhibit cell-type specificity? Our preliminary results showed that the preferred SF shifts to higher frequency after repetitive conditioning with HL spectral *** degree of shift is negatively correlated with the preferred SF of the *** modification of SF tuning induced by HL conditioning can last more than 10 ***,the correlation coefficient between the conditioning response and the spontaneous response increases with the time of conditioning.

关键词： in vivo whole-cell patch plasticity spatial frequency tuning spectral motion spaced learning synaptic input cell-type specificity

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