title: Multifocal visual evoked potential is dependent on electrode position.
abstract: OBJECTIVE
  To investigate whether the multifocal visual evoked potential (mVEP) is dependent on the electrode position, and to confirm the reproducibility of the mVEP.
  
  
  METHODS
  The mVEPs were recorded using the Veris III system with two different bipolar electrode settings. In Position 1, electrodes were placed at equal distances in vertical alignment 2 cm above and below the inion. In Position 2, the electrodes were placed in horizontal alignment at equal distances 2 cm to the left and right of the inion. Dartboard pattern stimulation was conducted. The mVEPs were repeatedly recorded from 4 volunteers, and mainly the second-order kernel response components were analyzed.
  
  
  RESULTS
  Although the reproducibility of mVEP was good in both Position 1 and Position 2, each waveform of the mVEP was drastically different between the two positions. This difference in the waveforms was clearly shown in the center and at the horizontal meridian. We also investigated the first-order kernel response components of the mVEPs. Several traces of the first-order kernel response components did not reveal flat traces. This point is also worthy of consideration.
  
  
  CONCLUSIONS
  Responses from mVEPs are clearly dependent on the electrode position.
authors.affiliation: Department of Ophthalmology, National Defense Medical College, Saitama Prefecture, Tokorozawa, Japan.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Kikuchi
authors.forename: Masaru
authors.initials: M
authors.lastname: Yoshii
authors.forename: Kenji
authors.initials: K
authors.lastname: Yanashima
authors.forename: Toshio
authors.initials: T
authors.lastname: Enoki
authors.forename: Tetsuyoshi
authors.initials: T
authors.lastname: Ide
authors.forename: Fumito
authors.initials: F
authors.lastname: Sakemi
authors.forename: Shigekuni
authors.initials: S
authors.lastname: Okisaka
mesh_terms: D000328:Adult; D004566:Electrodes; D004594:Electrophysiology / Q000295:instrumentation* / Q000379:methods*; D005074:Evoked Potentials, Visual; D006801:Humans; D010775:Photic Stimulation; D015203:Reproducibility of Results