The complexity of the afterpotential of rabbit A-type horizontal cells.
Afterpotentials of A-type horizontal cells (HCs) are believed to be rod-induced. They are, however, complex potentials and evidently of multiple causation. That part of the HC potential immediately after light-off is not entirely rod-determined because it has the same spectral sensitivity as the response to light-on, which is cone-induced with only some rod influence. It persists during a strong blue adapting light, which suppresses rod activity. The afterpotential may also be influenced by feedback from HCs to photoreceptors. The later part of the afterpotentials of A-type HCs is, however, rod dominated, as are the afterpotentials of axon terminals of B-type HCs.
Hanitzsch
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Carl-Ludwig-Institute of Physiology, University of Leipzig, Leipzig, Germany. hanr@medizin.uni-leipzig.de
Küppers-Tiedt
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L
D000818:Animals; D066298:In Vitro Techniques; D008564:Membrane Potentials / Q000502:physiology* / Q000528:radiation effects; D010775:Photic Stimulation / Q000379:methods; D011817:Rabbits; D012160:Retina / Q000166:cytology*; D051248:Retinal Horizontal Cells / Q000502:physiology*; D017948:Retinal Rod Photoreceptor Cells / Q000502:physiology; D013057:Spectrum Analysis; D014795:Visual Pathways / Q000502:physiology*