Neuromagnetic evidence that the P100 component of the pattern reversal visual evoked response originates in the bottom of the calcarine fissure

Kaoru Seki, Nobukazu Nakasato, Satoshi Fujita, Keisaku Hatanaka, Tsuyoshi Kawamura, Akitake Kanno, Takashi Yoshimoto

Research output: Contribution to journalArticlepeer-review

88 Citations (Scopus)

Abstract

Visual evoked magnetic fields due to pattern reversal stimuli were measured in 5 normal subjects using a helmet-shaped 66 channel magnetoencephalography system linked to MRT. The magnetic topography of the prominent 100 ms response (P100m) evoked by full-field visual showed a double-dipole pattern in the occipital areas of all subjects. Right or left half-field stimuli and upper or lower quadrant-field stimuli evoked a single-dipole pattern in the contralateral occipital area. The P100m sources were then localized using a current dipole model and superimposed on MRI images of each subject. The visual cortex was morphologically variable among the subjects, but the P100m dipoles were all localized at the lateral bottom of the calcarine fissure. Moreover, these P100m dipoles had similar orientations for both half- or quadrant-field stimuli. These results suggest that the P100m is located in a smaller part of the striate cortex than previously reported.

Original languageEnglish
Pages (from-to)436-442
Number of pages7
JournalElectroencephalography and Clinical Neurophysiology - Evoked Potentials
Volume100
Issue number5
DOIs
Publication statusPublished - 1996 Sep

Keywords

  • Dipole model
  • Functional anatomy
  • Magnetoencephalography
  • Pattern reversal stimuli
  • Striate cortex
  • Visual evoked response

ASJC Scopus subject areas

  • Neuroscience(all)
  • Clinical Neurology

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