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Maturation of human visual evoked potentials: 27 weeks conceptional age to 2 years
S Kos-Pietro1, V L Towle, R Cakmur
1Department of Neurology, University of Chicago, USA.
Insights
Visual evoked potentials reveal key infant visual development. Pattern resolution, P100 latency, and amplitude show significant changes from 27 weeks post-conception to 24 months, reflecting neural maturation.
Area of Science:
- Neuroscience
- Developmental Pediatrics
- Ophthalmology
Background:
- Assessing visual development in infants is crucial for early detection of potential disorders.
- Visual evoked potentials (VEPs) offer a non-invasive method to evaluate the integrity of the visual pathway.
Purpose of the Study:
- To characterize the developmental trajectory of visual evoked potentials in infants.
- To correlate VEP maturation with underlying neural development.
Main Methods:
- Recorded binocular pattern visual evoked potentials (P100) in 520 pediatric patients and 11 normal infants (27 weeks post-conception to 24 months).
- Measured P100 latency and amplitude across various check sizes.
- Analyzed developmental trends in pattern resolution, latency, and amplitude.
Main Results:
- Observed a rapid increase in pattern resolution near term.
- Noted a subsequent decrease in P100 latency.
- Documented a gradual increase in P100 amplitude.
Conclusions:
- These VEP changes indicate multifaceted early visual system maturation.
- Trends correlate with receptor development, myelination, and cortical synaptivity.
Abstract:
Visual evoked potentials to pattern reversal and diffuse flash stimulation were recorded from 520 consecutive pediatric patients and 11 normal infants between the ages of 27 weeks post-conception and 24 months. The latency and peak-to-peak amplitude of the first reproducible positive peak of the binocular pattern visual evoked potential (P100) were measured for five check sizes subtending from 15' to 4 degrees of arc. Three developmental trends were noted: 1) a rapid increase in pattern resolution near term, 2) a subsequent decrease in the latency of P100, and 3) a gradual increase in the amplitude of P100. These three trends reflect the multiplicity of early maturation and are discussed in terms of changes in receptor growth and density, pathway myelination, and cortical synaptivity.