title: Electrophysiological characterization of the spectral sensitivities of horizontal cells in cyprinid fish retina.
abstract: The spectral characteristics of horizontal cells of roach retina have been studied by a multi-disciplinary approach. Intracellular recording was combined with localized irradiation of the retina with spectrally selective laser beams to facilitate quantitative analyses. L1HC's were driven mainly by red (R)--sensitive cones. CbHC's were depolarized by R- and hyperpolarized by green (G)--and blue (B)--sensitive cones. The hyperpolarizing responses of L2HC's were also driven by B-, and G-sensitive cones, and, in addition, some depolarized to a 675 nm test stimulus. L2 units were relatively more abundant in dark-adapted retinae; during light adaptation, they became progressively less abundant. It is suggested that the spectral characteristics of some HC's are influenced by the adaptational state of the retina.
mesh_terms: D000818:Animals; D003530:Cyprinidae; D005074:Evoked Potentials, Visual / Q000187:drug effects; D007395:Interneurons / Q000187:drug effects / Q000502:physiology*; D007834:Lasers; D010775:Photic Stimulation; D010786:Photoreceptor Cells / Q000502:physiology; D010852:Picrotoxin / Q000494:pharmacology; D012160:Retina / Q000166:cytology*; D013053:Spectrophotometry
chemical_list: D010852:Picrotoxin