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Evoked cortical responses following stimulation of the thalamic VL nucleus in man.

It has been reported in our previous reports') 2) that single stimulation of the unilateral VL nucleus of the human thalamus constantly demonstrated three negative cortical evoked responses, namely the first negative wave (I-N) with a peak time of 8-12 msec, the second positive-negative wave (1I-PN) with a negative peak time of 40-50 msec and the third negative wave (III-N) with a peak time of 80-100 msec in bilateral central leads by averaging computer recordings. Distribution of the evoked responses following unilateral VL stimulation was also observed in both hemispheres and similarity of configuration of the responses in corresponding sites of the hemi spheres was noted in the frontal, the central and the parietal leads except the temporal leads. Low frequency stimulation of the VL nucleus of the thalamus elicited augmenting response (AR) in man, when the intensities of stimulation were as stronger as to induce clear bilateral evoked potentials in the case of the single stimulation of the parameters in usual EEG records. It is the purpose of this paper to report some additional experimental data, which have been observed by our supplemental experiments concerning investigation of the possible pathway from the stimulated VL nucleus to the contralateral cortex and analysis of AR following the VL stimulation in man.