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• W2019957352 abstract "Habituation and restoration of somatosensory evoked potentials were demonstrated at multiple selected sites in the lemniscal system of the cat. Potentials were evoked by minimal suprathreshold stimuli delivered at regular intervals to the skin of the forepaw. Evoked responses declined as a function of time in the medial lemniscus, the nucleus ventralis postero-lateralis of the thalamus, the somatosensory cortex, and the pyramidal tract, but responses did not decline in the presynaptic dorsal columns, indicating the importance of the first synaptic relay. We also observed habituation in ventro-basal thalamus to stimulation of dorsal columns and medial lemniscus, and habituation in the somatosensory cortex to stimulation of medial lemniscus and ventro-basal thalamus, although we never observed habituation of the response of the pyramidal tract to stimulation of the cortex. Thus, it seems likely that habituation is characteristic of each nuclear group and not exclusively of any specific ascending or descending pathway. It was also demonstrated that habituation will take place in: (1) subjects anesthetized with a high dosage of alpha chloralose; (2) in the locally anesthetized, curarized preparation; and (3) in subjects with prior dorsal column section. The theoretical implications of these results were discussed. L'habituation et la restauration des potentiels évoqués somato-sensoriels sont mises en évidence à plusieurs points choisis du systéme lemniscal du chat. Les potentiels sont évoqués par des stimuli faibles supra-luminaires donnés à intervalles réguliers à la peau de la patte antérieure. Les réponses évoquées diminuent en fonction du temps dans le lemniscus médian, le noyau ventralis posterolateralis du thalamus, le cortex somatosensitif et le tractus pyramidal, mais les réponses ne diminuent pas dans les colonnes dorsales présynaptiques, ce qui indique l'importance du premier relai synaptique. Nous avons observé également l'habituation dans le thalamus ventro-basal aprés stimulation des colonnes dorsales et du lemniscus médian, et l'habituation dans le cortex somato-sensitif à la stimulation du lemniscus médian et du thalamus ventrobasal, bien que nous n'ayions jamais observé d'habituation de la réponse du tractus pyramidal à la stimulation du cortex. Ainsi, il semble vraisemblable que l'habituation soit caractéristique de chaque groupe nucléaire, et non exclusivement d'une voie ascendante ou descendante spécifique. Il est également démontré que l'habituation peut survenir: 1. chez des animaux anesthésiés avec dosage élevé d'alphachloralose; 2. dans les préparations anesthésiées localement et curarisées; et 3. chez des animaux avec section préalable de la colonne dorsale. Les implications théoriques de ces résultants sont discutées." @default.
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• W2019957352 title "Habituation of somatosensory evoked potentials in the lemniscal system of the cat" @default.
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• W2019957352 doi "https://doi.org/10.1016/0013-4694(72)90005-3" @default.
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