title: [Oscillatory potentials in the retina: the effects of GABA agonists.].
abstract: We have recorded the electroretinogram from 19 superfused eyecups of the Xeiiopus retina in order to assess the effects of agonists of the inhibitory neurotransmitter gamma-aminobutyric acid (GA notBA), on both oscillatory potentials and the b-wave. We found that in seven eyecups the GABA uptake blocker nipecotic acid (0.1-5 mM) reduced the amplitudes of the oscillatory potentials, without having an effect on the b-wave unless it was applied in larger doses. The GABAB agonist baclofen (0.05-3 mM) reduced the amplitude of the ERG b-wave selectively in seven eyecups tested, without any effect on the amplitude of the oscillatory potentials. The GABAA agonist aminovaleric acid (0.05-3 mM) on the other hand, selectively reduced the oscillatory potentials in five, but had no reliable effects on the Xenopus b-wave. These results suggest that GABAergic mechanisms related to both A and B receptor types induce different influence on the amplitude of the oscillatory potentials and the b-wave.
authors.forename: A
authors.initials: A
authors.lastname: Arnarsson
authors.forename: J M
authors.initials: JM
authors.lastname: Einarsson
authors.forename: T
authors.initials: T
authors.lastname: Eysteinsson