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- W2073662952 abstract "The responses of single neurons antidromically activated by stimulation of the thalamic nucleus ventralis posteromedialis (VPM) were recorded in the trigeminal brain stem nuclei and the sensorimotor cerebral cortex (CX) of cats. An orofacial input was identified for every brain stem relay neuron tested but very few CX neurons projecting to the thalamus had a trigeminal field. A change in excitability (presynaptic depolarization or presynaptic hyperpolarization) produced by facial and CX conditioning stimuli was measured indirectly as a change in the level of excitation of the axonal endings of a neuron antidromically activated from the thalamus. The conditioning stimuli routinely altered the excitability of the thalamic endings of brain stem relay neurons whereas corticothalamic afferents only occasionally exhibited an excitability change. Presynaptic depolarization followed by presynaptic hyperpolarization was the common effect in both the unanesthetized and anesthetized states and this sequence correlated with the time course of afferent and cortically induced inhibition and facilitation observed in VPM neurons. The findings indicate that presynaptic mechanisms play a role in the modification of thalamic neuronal activity." @default.
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- W2073662952 date "1971-02-01" @default.
- W2073662952 modified "2023-09-23" @default.
- W2073662952 title "Presynaptic excitability changes of trigeminothalamic and corticothalamic afferents" @default.
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- W2073662952 doi "https://doi.org/10.1016/s0014-4886(71)80004-3" @default.
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