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Development of PVEP in infants and children
1Zhongshan Opthalmic Center, Sun Yat-Sen University of Medical Sciences, Gaungzhou, China.
Insights
Visual evoked potential (VEP) development in children shows distinct phases. Low spatial frequencies mature by 4 months, while high spatial frequencies take up to 9 years to reach adult levels.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Ophthalmology
Background:
- Visual evoked potentials (VEP) are crucial for assessing visual pathway development.
- Understanding VEP maturation in infants and children provides insights into visual system development.
Purpose of the Study:
- To investigate the developmental trajectory of VEP components in infants and children.
- To identify age-related changes in VEP latency and amplitude across different spatial frequencies.
Main Methods:
- VEP recordings were obtained from 150 infants and children (2 weeks to 9 years) and 10 adults.
- Stimuli included varying spatial frequencies (140', 70', 35', 17.5' checks).
- Analysis focused on VEP waveform, P1 wave appearance, latency, and amplitude (N1P1, P1N2).
Main Results:
- VEP waveform evolved from simple to complex with age.
- P1 wave appeared by 10 weeks; latency decreased significantly by 4 months.
- Low spatial frequencies reached adult latency by 4 months, medium by 4 years, and high by 9 years.
- N1P1 and P1N2 amplitudes were higher in children than adults and age-independent from 2 months to 9 years.
Conclusions:
- Visual function development in infants and children occurs in distinct phases, characterized by spatial frequency maturation.
- VEP development shows parallel maturation in both eyes.
- Significant differences in VEP amplitudes exist between children and adults.
Abstract:
The development of components of VEP was studied in 150 infants and children between 2 weeks and 9 years of age participated as subjects. Ten adult subjects, 25 to 35 years of age were also studied. The results indicated that the VEP had a simple wave form, consisting of only a slowly rising positive wave to 140', 70' and 35' checks from infants of 2 to 8 weeks following birth. P1 wave appeared in response to 17.5' check stimulus at 10 weeks following birth. The latencies of P1 components shortened dramatically from infants of 2 to 4 months and the latencies of low spatial frequencies (140' and 70' checks) from infants at 4 months of age reached adult level but P1 latency of medium spatial frequency (35' check) did not reach adult level until age of 4 years. The latency of P1 component of high spatial frequency was matured by the end of 9 years of age. The development of P1 waves from both eyes was parallel in normal infants and children. The amplitudes N1P1 and P1N2 from infants and children with 2 months to 9 years were not affected by the age and significantly higher than those of adults group by 2 to 3 factors. Based on the results of our research, three phases were found in the development of the visual function in infants and children. The first phase was up to 4 months after birth, and characterized by the maturation of the low spatial frequencies.(ABSTRACT TRUNCATED AT 250 WORDS)