P1 and P2 components of human visual evoked potentials are modulated by depth perception of 3-dimensional images.
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.
Omoto
Shu
S
Department of Ophthalmology, Yokohama City University, Graduate School of Medical Sciences, Kanazawa-ku, Yokohama, Japan.
Kuroiwa
Yoshiyuki
Y
Otsuka
Saika
S
Baba
Yasuhisa
Y
Wang
Chuanwei
C
Li
Mei
M
Mizuki
Nobuhisa
N
Ueda
Naohisa
N
Koyano
Shigeru
S
Suzuki
Yume
Y
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