Scotopic Visibility Curve in Man Obtained by the VER

  • C. Huber
  • Emiko Adachi-Usami
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 24)


The evidence attributing the retinal origin of the visual evoked response in man to the photopic system rests on two different kinds of experiments. One approach stresses the contribution of the cones: the cortical response grows up to 5° fovea) eccentiricity with the number of cones stimulated (van Lith and Henkes, 1970); the VER shows a Stiles-Crawford effect (de Voe, Ripps and Vaughan, 1968); the spectral sensitivity of the VER fits approximately the photopic luminosity curve (Armington, 1966; Cavonius, 1965; May and Siegfried, 1970). The localization of retinal areas able to elicit the VER have also been studied: using sinusoidally alternating half fields of 15° as a stimulus, Cooper and Robson (1970) were able to localize the centre of the visual field to within 15′ of the fixation point. The effect of check-size using flash or checker board reversal stimulation (Harter and White, 1970; Spekreijse, 1966) showing the influence of visual acuity on VER amplitude also points to the fovea for evoking the VER.


Dark Adaptation Light Adaptation Test Light Cone Input Chlorided Silver 
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Copyright information

© Plenum Press, New York 1972

Authors and Affiliations

  • C. Huber
    • 1
  • Emiko Adachi-Usami
    • 1
  1. 1.Abteilung für experimentelle Ophthalmologie (II. Physiol. Abt.)W.G. Kerckoff-Instituts der Max-Planck-GesellschaftBad NauheimGermany

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