Patterned Visually Evoked Potential Variability: A Nine-Hour Study

S.L. Lu; M.M. Spafford

doi:10.65636/cjo.v51i3.7019

Authors

S.L. Lu
M.M. Spafford

DOI:

https://doi.org/10.65636/cjo.v51i3.7019

Keywords:

patterned steady state, transient vissually evoked potentials

Abstract

Patterned steady state and transient Visually Evoked Potentials (VEPs) were recorded in ten visually normal observers on an hourly basis for 9 consecutive hours. The amplitudes and the implicit times of the VEPs showed no significant change or trend over the nine hour period and, hence, the VEP appeared to be independent of significant diurnal or fatigue effects for the conditions studied. Inter-subject variation in the VEP was also examined. The findings also emphasize the importance of considering pupil size when recording the VEP.

References

I. Sokol S. Visually evoked potentials: theory, technique and clinical applications. Sur Ophthalmol 21(1): 18--44, 1976. DOI: https://doi.org/10.1016/0039-6257(76)90046-1

2. Ellingson R, Lathrop G, Dahany T, Nelson B. Variability of visually evoked potentials in human infants and adults. Elecrroencephalogr Clin Neurophysiol 34: I 13-24, 1973. DOI: https://doi.org/10.1016/0013-4694(73)90038-2

3. Ciganek L. Variability of the human visually evoked potential: normative data. Electroencephalogr Clin Neurophysiol 27: 35--47, 1969. DOI: https://doi.org/10.1016/0013-4694(69)90106-0

4. Lovasik N, Ahmedbhai N. Stimulus contaminants in visual electrophysiology. Am J Oprom Physiol Opt 62(5): 334--43, 1985. DOI: https://doi.org/10.1097/00006324-198505000-00006

5. van Brocklin MD, Hirons RR, Langfield WH, Yolton RL. The visually evoked response: reliability revisited. J Am Optom Assoc 50(12): 1372-9, 1979.

6. Kergoat H. Video display units and visual fatigue. 1987. MSc Thesis. University of Waterloo, School of Optometry.

7. Ericson LA. 24 hourly variation of aqueous flow. Acta Ophrhalmol Suppl 50: 1-95, 1958.

8. Lovasik N, Spafford M, Szymkiw M. Modification of pattern reversal VERs by ocular accommodation. Vision Res 25(4): 599-608, 1985. DOI: https://doi.org/10.1016/0042-6989(85)90166-X

9. Wooten BR. Photopic and scotopic contributions to the human visually evoked cortical potential. Vision Res 12: 1647-60, 1972. DOI: https://doi.org/10.1016/0042-6989(72)90036-3

1O. DeVoe RG, Ripps H, Vaughan Jr HG. Cortical responses to stimulation of the human fovea. Vision Res 8: 135--47, 1968. DOI: https://doi.org/10.1016/0042-6989(68)90002-3

11. Spafford MM, Trotter AJ. Neural indices of short-term visual deprivation in humans: effects upon the patterned VEP. Can J Oprom 51(2): 67-73, 1989. DOI: https://doi.org/10.65636/cjo.v51i2.7013

12. Apkarian PA, Nakayama K, Tyler C. Binocularity in the human visually evoked potential: facilitation, summation, and suppression. Electroencephalogr Clin Neurophysiol 51: 32--48, 1981. DOI: https://doi.org/10.1016/0013-4694(81)91507-8