Spatial and chromatic interactions in the human pattern electroretinogram

Vision Research
M KorthO Sembritzki

Abstract

The spectral sensitivity and the spatial selectivity was studied both psychophysically and electroretinographically using the pattern onset-offset paradigm. All measurements were made under intensive yellow adaptation. The spectral sensitivity functions of both measures were in close agreement. They showed a peak at 460 nm (blue-sensitive mechanism) and a shoulder around 550 nm (red-green-sensitive mechanism). The luminance curves of the pattern onset ERG obtained with long wavelengths had a steeper slope and reached larger amplitudes than those obtained with short wavelengths. In addition the response-peak times were longer with short wavelengths. When the spatial frequency of the pattern was varied the 460 nm-onset responses showed very little or no spatial tuning and long peak times (around 60 msec). This was ascribed to the contribution from only one type of ganglion cell, namely the blue-yellow opponent receptive fields lacking a center-surround organization. The 550 nm-onset responses showed a clear spatial tuning (4 c/deg) and an increase in peak time (40-50 msec) with increasing spatial frequency (0.26-9.2 c/deg). This was ascribed to different types of receptive fields having a center-surround structure.

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Citations

Jul 1, 1997·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·W M BuddeC Y Mardin
May 1, 1994·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·D A Thompson, N Drasdo
Jul 22, 2010·Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie·Yisheng ZhongLieqin Xie
Jul 17, 1998·Vision Research·A KlistornerS G Crewther

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