title: Electrophysiological studies on the nucleus isthmi of the lizards Gekko gekko and Shinisaurus crocodilurus.
abstract: This report studies visual responses of the isthmic units in Gekko gekko and Shinisaurus crocodilurus using extracellular recording and cobalt sulfide marking techniques. Our results indicate that: (i) the nucleus isthmi pars magnocellularis (Imc) is a visual center; (ii) there are luxotonic units in Imc; (iii) Imc units respond vigorously to moving contrast targets, of which 35% units burst only at the moment when targets are moving into and out of their receptive fields, none react to either tactile or auditory stimulation; (iv) there exist binocular units in Imc; and (v) visual field is topographically projected onto Imc.
mesh_terms: D000818:Animals; D004594:Electrophysiology; D008116:Lizards / Q000502:physiology*; D009899:Optic Lobe, Nonmammalian / Q000502:physiology*; D010828:Physiology, Comparative; D014796:Visual Perception / Q000502:physiology*