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Visual evoked cortical magnetic fields to pattern reversal stimulation

A Nakamura1, R Kakigi, M Hoshiyama

  • 1Department of Integrative Physiology, National Institute for Physiological Sciences, Okazaki, Aichi, Japan.

Brain Research. Cognitive Brain Research
|July 1, 1997
PubMed
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This study mapped visual evoked magnetic fields in healthy subjects, identifying key components like P100m in the striate cortex. Findings support the visual cortex

Area of Science:

  • Neuroscience
  • Visual Neuroscience
  • Magnetoencephalography

Background:

  • Visual evoked potentials (VEPs) and magnetic fields (VEMFs) are crucial for studying visual processing.
  • Understanding the origin of VEMF components aids in localizing brain activity within the visual cortex.

Purpose of the Study:

  • To investigate the spatial origin of visual evoked magnetic field components using pattern reversal stimulation.
  • To compare the retinotopic organization of VEMF components with known visual cortex models.

Main Methods:

  • Magnetoencephalography (MEG) was used to record VEMFs in six healthy subjects.
  • Pattern reversal visual stimulation was employed.
  • Equivalent current dipoles (ECDs) were calculated to estimate the location of neural sources.

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Main Results:

  • Triphasic deflections (N75m-P100m-N145m) were observed, analogous to VEP components.
  • The P100m component's ECDs were localized near the calcarine fissure, consistent with striate cortex origin.
  • The N145m component's ECDs, localized in the extrastriate cortex, showed retinotopic organization with greater vertical separation for upper vs. lower visual fields.

Conclusions:

  • The P100m component likely originates in the striate cortex, supporting retinotopic organization models.
  • The N145m component originates in the extrastriate cortex, also demonstrating retinotopic mapping.
  • MEG and ECD analysis provide valuable insights into the functional neuroanatomy of the human visual cortex.