Neuromagnetic localization of N15, the initial cortical response to lip stimulus

Ken Ichi Nagamatsu, Nobukazu Nakasato, Keisaku Hatanaka, Akitake Kanno, Masaki Iwasaki, Takashi Yoshimoto

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


The initial cortical response of the trigeminal somatosensory evoked magnetic fields was measured for electrical stimulation of the lower lip in eleven subjects. The stimulus frequency was 0.7 Hz and stimulus intensity was nine times sensory threshold. The initial contralateral response was detected in 20 hemispheres at a latency of 14.6 ± 1.3 ms and was named N15m. The equivalent current dipole of N15m was localized at the posterior bank of the central sulcus with anterior-superior orientation, and inferior to the dipole of N20m for median nerve stimulation.

Original languageEnglish
Pages (from-to)1-5
Number of pages5
Issue number1
Publication statusPublished - 2001 Jan 22


  • Central sulcus
  • Lip
  • Magnetoencephalography
  • Primary somatosensory cortex
  • Somatosensory evoked potential
  • Trigeminal nerve


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