Abstract
Using the b-wave of the electroretinogram (ERG) and the initial positive wave of the visually evoked cortical potential (VECP). spectral sensitivity curves were determined for the retina and visual cortex of the hooded rat. The results show that the retina is maximally sensitive in the region of 485–500nm under scotopic conditions with an increase in long-wave sensitivity under photopic conditions. The results for the cortex showed a maximum in the region of 485–500nm and an increased sensitivity in the long-wave region under both photopic and scotopic conditions. These findings and the anatomical' evidence for cones provide further support for the existence of at least 2 types of receptors in the rat retina.
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