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[Electrophysiologic study of somatic representation in Cavia cobaya guinea pig thalamus].

The effects of stimulation of the sciatic nerve and ipsilateral thalamic parafascicular nucleus on the thalamic posterior nucleus have been investigated by recording both the evoked potentials (EP) and neuronal activity in guinea pigs under light chloralose or nembutal anaesthesia. Animals were immobilized by d-tubocurarine and kept under artificial respiration. Widely spread EP to sciatic stimulation were recorded with a latency of about 10-60 ms. In most cases they had a positive-negative configuration which was followed by a secondary wave of a complex composition. Simultaneously recorded neuronal firings had a group character and primarily were related to the positive component or to the onset of the negative component of the EP. Both the EP and neuronal responses to stimulation of the parafascicular nucleus had mainly short latencies (3-12 ms) and monophasic negative configuration. The inhibitory effect of conditioning stimulation of the parafascicular nucleus on somatically evoked responses was demonstrated as well.