Short latency trigeminal evoked potentials: normative data and clinical correlations

Jean F. Soustiel, Moshé Feinsod, Hava Hafner

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


A very short latency trigeminal evoked potential (STEP) to electrical stimulation of the upper lip has been recorded from over the scalp. This potential consists of 5 distinct peaks within the 12 msec range. Normative data were obtained from 25 healthy volunteers. The impact of the stimulus rate and intensity on the response was studied in each subject. These results were compared to those of 19 patients suffering from lesions involving the trigeminal system in its peripheral aspect or the brain-stem. The STEP was consistently abnormal whenever the involved side was stimulated. Changes in peak latencies and in interpeak latency differences (IPLD) correlated well with clinical and radiological findings and improved with the removal of the offending lesion. The STEP proved to be a reliable method for evaluating the trigeminal system in its peripheral and central pathways; it may thus serve as an additional parameter for studying brain-stem functions.

Original languageEnglish
Pages (from-to)119-125
Number of pages7
JournalElectroencephalography and Clinical Neurophysiology/ Evoked Potentials
Issue number2
StatePublished - 1991
Externally publishedYes


  • Brain-stem
  • Short latency trigeminal evoked potential
  • Somatosensory


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