In:
Visual Neuroscience, Cambridge University Press (CUP), Vol. 23, No. 3-4 ( 2006-05), p. 447-451
Abstract:
The aim is to study chromatic visual evoked potentials (VEP) to
isoluminant red-green (R-G) stimulus in schoolchildren. Sixty children (7–19 years) with normal color vision were examined, 30 binocularly
and 30 monocularly. The isoluminant point was determined for each child subjectively by using heterochromatic flicker photometry, and objectively
from recordings. The stimulus was a 7° circle composed of horizontal sinusoidal gratings, with spatial frequency 2 cycles/degrees and 90%
contrast, presented in onset-offset mode. VEP were recorded from Oz (mid-occipital) position. Age-dependent waveform changes and changes of
the positive and negative wave were studied to both binocular and monocular R-G stimulation. Age-dependent waveform changes were observed to
binocular and monocular R-G stimulation. In younger children the positive wave was prominent, whereas in older children also the negative wave
became more evident. The latency of the positive wave decreased linearly with age to R-G binocular stimulation. To monocular stimulation no
significant changes of the latency were observed. The amplitude of the positive wave dropped exponentially with age to binocular and monocular
stimulation. The latency of the negative wave increased linearly with age to binocular and monocular stimulation, whereas the amplitude did not show
age-dependent changes. These findings suggest that the chromatic VEP response undergoes evident age-dependent changes during the school-age
period.
Type of Medium:
Online Resource
ISSN:
0952-5238
,
1469-8714
DOI:
10.1017/S0952523806233108
Language:
English
Publisher:
Cambridge University Press (CUP)
Publication Date:
2006
detail.hit.zdb_id:
1489922-X
SSG:
12
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