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The electroretinogram (ERG) is a non-invasive indicator of retinal function. Light flashes evoke a cornea-negative a-wave followed by a cornea-positive b-wave. Light-adaptation is known to increase the amplitude of cone-dependent b-waves. To identify the underlying mechanism, we recorded rat cone photoresponses in situ, using intravitreally-injected glutamate to block synaptic transmission and intense...
In the light-adapted vertebrate retina, nitric oxide (NO) modulates synaptic transmission between photoreceptors and second-order neurons. Although NO is believed to be a mediator of adaptation, its effect on photoreceptors in situ is not known yet. Therefore, we studied rod and cone activities in rat eyes in situ, using the electroretinogram (ERG). Rod and cone ERGs were functionally isolated by...
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