title: P1 and P2 components of human visual evoked potentials are modulated by depth perception of 3-dimensional images.
abstract: OBJECTIVE
  To determine the cerebral activity correlated with depth perception of 3-dimensional (3D) images, by recording of human visual evoked potentials (VEPs).
  
  
  METHODS
  Two figures consisting of smaller and larger squares were presented alternately. VEPs were recorded in two conditions. In condition I, we used two figures which yielded flat 2-dimensional images. In condition II, we used two figures which yielded 3D images, which were concave and convex, respectively.
  
  
  RESULTS
  P1, P2, and N1/P2 amplitude were significantly greater in condition II than in condition I. The P1/N1 amplitude tended to be greater in condition II than in condition I. P1 and N1 were predominantly distributed over the right temporo-parieto-occipital regions. P2 and N2 were distributed over bilateral parieto-occipital regions.
  
  
  CONCLUSIONS
  The difference in P1 amplitude between two conditions can be explained by the difference between conditions, one of which yielded depth perception while the other did not, since previous studies showed that P1 and N1 are modulated by perception of images in depth. The role of P2 and the mechanism responsible for the increase in P2 amplitude during condition II remain unknown.
  
  
  CONCLUSIONS
  We recorded VEPs and identified electrophysiological correlates of depth perception with 3D images produced by concave/convex figures.
authors.affiliation: Department of Ophthalmology, Yokohama City University, Graduate School of Medical Sciences, Kanazawa-ku, Yokohama, Japan.
authors.forename: Shu
authors.initials: S
authors.lastname: Omoto
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Kuroiwa
authors.forename: Saika
authors.initials: S
authors.lastname: Otsuka
authors.forename: Yasuhisa
authors.initials: Y
authors.lastname: Baba
authors.forename: Chuanwei
authors.initials: C
authors.lastname: Wang
authors.forename: Mei
authors.initials: M
authors.lastname: Li
authors.forename: Nobuhisa
authors.initials: N
authors.lastname: Mizuki
authors.forename: Naohisa
authors.initials: N
authors.lastname: Ueda
authors.forename: Shigeru
authors.initials: S
authors.lastname: Koyano
authors.forename: Yume
authors.initials: Y
authors.lastname: Suzuki
mesh_terms: D000328:Adult; D002540:Cerebral Cortex / Q000502:physiology*; D003867:Depth Perception / Q000502:physiology*; D004569:Electroencephalography / Q000379:methods*; D005074:Evoked Potentials, Visual / Q000502:physiology*; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D008297:Male; D009415:Nerve Net / Q000502:physiology; D009483:Neuropsychological Tests; D010364:Pattern Recognition, Visual / Q000502:physiology; D010775:Photic Stimulation; D011930:Reaction Time / Q000502:physiology; D055815:Young Adult