Kristian Donner

TL;DR: In this paper, the authors investigated the accuracy limits of putative universal templates for visual pigment absorbance spectra, and if possible to amend the templates to overcome the limitations, and concluded that the idea of universal templates remains valid and useful at the present level of accuracy of data on photoreceptor absorbance.

TL;DR: The performance of dark-adapted toads and frogs is studied and it is shown that the performance limit of visually guided behaviour is also set by thermal isomerizations, as visual sensitivity limited by thermal events should rise when the temperature falls.

TL;DR: It is concluded that the threshold performance of dark-adapted cone as well as rod vision can be consistently described as noise-limited, but not by postulating a multi-quantum coincidence requirement for single receptors; the underlying intrinsic activity in both the cone and the rod system is light-like as regards correspondence between noise effect and background adaptation effect.

TL;DR: The evidence obtained in experiments at different temperatures suggests that it is metarhodopsin II, which exists in a tautomeric equilibrium with metar Rhodopsin I, that causes this desensitization of the rods.

TL;DR: The results in weak but clearly supra-threshold illumination indicate that snaps were aimed at the advancing head as seen by the brain, but landed further backwards in proportion to the retinal latency, suggesting that the animal had recourse to a neural representation of the regularly moving dummies to correct for the slowness of vision.