Med Biol Eng Comput - Thalamic reticular cells firing modes and its dependency on the frequency and amplitude ranges of the current stimulus.

Tópicos

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Resumo

The neurons of the Thalamic Reticular Nucleus (TRNn) respond to inputs in two activity modes called burst and tonic firing and both can be observed in different physiological states. The functional states of the thalamus depend in part on the properties of synaptic transmission between the TRNn and the thalamocortical and corticothalamic neurons. A dendrite can receive inhibitory and excitatory postsynaptic potentials. The novelties presented in this paper can be summarized as follows: First, it shows, through a computational simulation, that the burst and tonic firings observed in the TRNn soma could be explained as a product of random synaptic inputs on the distal dendrites, the tonic firings are generated by random excitatory stimuli, and the burst firings are generated by two different types of stimuli: inhibitory random stimuli, and a combination of inhibitory (from TRNn) and excitatory (from corticothalamic and thalamocortical neurons) random stimuli; second, according to in vivo recordings, we have found that the burst observed in the TRNn soma has graduate properties that are proportional to the stimuli frequency; and third, a novel method for showing in a quantitative manner the accelerando-decelerando pattern is proposed.

Resumo Limpo

neuron thalam reticular nucleus trnn respond input two activ mode call burst tonic fire can observ differ physiolog state function state thalamus depend part properti synapt transmiss trnn thalamocort corticothalam neuron dendrit can receiv inhibitori excitatori postsynapt potenti novelti present paper can summar follow first show comput simul burst tonic fire observ trnn soma explain product random synapt input distal dendrit tonic fire generat random excitatori stimuli burst fire generat two differ type stimuli inhibitori random stimuli combin inhibitori trnn excitatori corticothalam thalamocort neuron random stimuli second accord vivo record found burst observ trnn soma graduat properti proport stimuli frequenc third novel method show quantit manner accelerandodecelerando pattern propos

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