Visual-evoked magnetic fields associated with geometric and phonetic discrimination

Shiann Fong Huang, Keiji Iramina, Masato Yumoto, Shoogo Ueno

Research output: Contribution to journalConference articlepeer-review


The endogenous negativity of the early negative component of event-related potential or event-related magnetic field might reveal some aspects of cognitive processes. In this paper, we identified the activated area for an early negative component (designated NA) which seems to be associated with pattern recognition processes by measuring the magnetic fields. The difference between the geometric-discriminative response and the phonetic-discriminative response was also obtained. The visual evoked magnetic field was measured with a 204-channel whole-scalp superconducting quantum interference device gradiometer and estimated the equivalent current dipoles (ECD) to clarify the source localization of NA. Localization of a single ECD was applied for the main peak of the NA component in the magnetoencephalogram response. In this paper, the ECD sources were localized in the parietal and temporal sections of the brain.

Original languageEnglish
Pages (from-to)3341-3343
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number5 I
Publication statusPublished - Sept 2002
Externally publishedYes
Event2002 International Magnetics Conference (Intermag 2002) - Amsterdam, Netherlands
Duration: Apr 28 2002May 2 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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