title: Effect of neuropeptide-Y on tectal field potentials in the toad.
abstract: Field potentials (FP) recorded from the surface of toad's optic tectum (OT) to electrical stimulation of the contralateral optic nerve (ON) show initial positive deflections P*, followed by negative wave N and positive wave P; the former result from axonal inputs, the latter two resemble excitatory and inhibitory postsynaptic processes, respectively. Electrostimulation of the pretectum ipsilaterally to the recorded OT--preceeding ON-stimulation--strongly attenuates the N wave, suggesting pretectotectal inhibitory influences. The N wave of the tectal FP evoked by ON-stimulation is reduced, too, after application of the neuropeptide-Y (NPY) to the tectal surface. Previous authors have shown that frog's pretectum contains NPY immunoreactive pretectotectal projecting cells.
authors.affiliation: Abteilung Neurobiologie, Fachbereich Biologie/Chemie (FB 19), Universität Kassel/GhK, Germany.
authors.forename: W W
authors.initials: WW
authors.lastname: Schwippert
authors.forename: J P
authors.initials: JP
authors.lastname: Ewert
mesh_terms: D000818:Animals; D002024:Bufo marinus; D004558:Electric Stimulation; D005071:Evoked Potentials; D009478:Neuropeptide Y / Q000494:pharmacology*; D013477:Superior Colliculi / Q000187:drug effects* / Q000502:physiology
chemical_list: D009478:Neuropeptide Y