Blog
About

  • Record: found
  • Abstract: found
  • Article: not found

The spatial location of EEG electrodes: locating the best-fitting sphere relative to cortical anatomy.

Electroencephalography and clinical neurophysiology

Photic Stimulation, Brain, anatomy & histology, physiology, Brain Mapping, Electrodes, Electroencephalography, Adult, instrumentation, Evoked Potentials, Visual, Female, Humans, Magnetic Resonance Imaging, Male

Read this article at

ScienceOpenPubMed
Bookmark
      There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

      Abstract

      The location of the international 10-20 system electrode positions and 14 fiducial landmarks are described in cartesian coordinates (+/- 1.4 mm average accuracy). Six replications were obtained on 3 separate days from 4 normal subjects, who were compared to each other with a best-fit sphere algorithm. Test-retest reliability depended on the electrode position: the parasagittal electrodes were associated with greater measurement errors (maximum 7 mm) than midline locations. Location variability due to head shape was greatest in the temporal region, averaging 5 mm from the mean. For each subject's electrode locations a best-fitting sphere was determined (79-87 mm radius, 6% average error). A surface-fitting algorithm was used to transfer the electrode locations and best-fitting sphere to MR images of the brain and scalp. The center of the best-fitting sphere coincided with the floor of the third ventricle 5 mm anterior to the posterior commissure. The melding of EEG electrode location information with brain anatomy provides an empirical basis for associating hypothetical equivalent dipole locations with their anatomical substrates.

      Related collections

      Author and article information

      Journal
      7678386

      Comments

      Comment on this article