In support of the “photopigment model” of vision in invertebrates

Summary Observations of the prolonged depolarising afterpotential (PDA) show that the rate of decay of a PDA is directly proportional of the extent of conversions of rhodopsin to metarhodopsin (regulated by controlled light stimuli). The experiments were designed to detect the effects of a hypothetical inhibitor (proposed by the Excitor-Inhibitor model of invertebrate vision); the results do not support the existence of an inhibitor, but further corroborate the already proposed Photopigment Model.Abbreviations E-I model Excitor-Inhibitor model - LRP late receptor potential - PDA prolonged depolarising afterpotentialThis work was part of the programme of the Sonderforschungsbereich 114, financed by the Deutsche Forschungsgemeinschaft