Short Latency Somatosensory-Evoked Potentials—Direct Recording from the Human Midbrain and Thalamus

Summary

Short latency somatosensory-evoked potentials were recorded from the human thalamus and the midbrain during stereotactic operations. Several subcomponents were recognized on the peak of N 18. These were recorded with maximal amplitude at the border between the caudal portion of the thalamus and the rostral midbrain. Two positive-negative responses, not previously shown, were observed between P 14 and N 18. These responses were prominent in the rostral midbrain. These findings indicat that the ascending phase of N 18, and the N 18 itself, are the compound potential generated in the mesodiencephalic junction.