Abstract
We assessed the contribution of GABAa and GABAc receptors to GABAergic effects on b- and d-wave in frog ERG in a wide range of light stimulation conditions. The amplitude of both b- and d-wave was increased during GABAa receptor blockade by bicuculline as well as during additional GABAc receptor blockade by picrotoxin. The effects of GABAa receptor blockade were more pronounced in light adaptation conditions. They strongly depended on stimulus intensity and showed considerable ON/OFF-response asymmetry. The effects of GABAc receptor blockade were more pronounced in dark adaptation conditions. They didn’t vary much with stimulus intensity and showed little ON/OFF-response asymmetry.
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