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STUDY ON DYNAMIC DISPARITY EVOKED POTENTIAL AND PATTERNVISUAL EVOKED POTENTIAL IN DIFFERENT AGE GROUPS

A software package for generating dynamic random dot stereograms (DRDS) and light-dark checkerboard was developed as visual stimulus. With the stimuli, the dynamic disparity-evoked potentials (DEP) and the pattern-visual-evoked-potentials(PVEP) were, respectively ,recorded in 30 pre-school children, 30 school children and 30 adults who have normal stereopsis in psychophysical experiments. The results show as follows ①there is statistically significant differences in the latencies of DEP's N wave between the three groups. The latencies become shorter as the age increases. ② no statistically significant differences are found in the latencies of PVEP's P100 wave between the three groups, but there are statistically significant differences in the amplitudes of PVEP's P100 wave. The amplitude of PVEP's P100 of school children group is the highest and that of the adults is the lowest. These results suggest that the development of stereopsis and primary visual function are different between the three groups. The stereopsis of before age 12 children still has plasticity.