‘The last channel’: vision at the temporal margin of the field

Abstract

The human visual field, on the temporal side, extends to at least 90° from the line of sight. Using a two-alternative forced-choice procedure in which observers are asked to report the direction of motion of a Gabor patch, and taking precautions to exclude unconscious eye movements in the direction of the stimulus, we show that the limiting eccentricity of image-forming vision can be established with precision. There are large, but reliable, individual differences in the limiting eccentricity. The limiting eccentricity exhibits a dependence on log contrast; but it is not reduced when the modulation visible to the rods is attenuated, a result compatible with the histological evidence that the outermost part of the retina exhibits a high density of cones. Our working hypothesis is that only one type of neural channel is present in the far periphery of the retina, a channel that responds to temporally modulated stimuli of low spatial frequency and that is directionally selective.

Using Eye Tracking to Measure Overall Usability of Online Grocery Shopping Websites

“…Because usability is largely experiential, relying solely on explicit self-report metrics runs the risk of misinterpretation because experiences might be conscious or unconscious (Likierman, 2006). That said, one of the methods which have been frequently used for measuring non-conscious experience is eye-tracking (Beattie & McGuire, 2012;Veto, Thomas, Alexander, Wemyss, & Mollon, 2020). Thanks to the recent development of eye-tracking technology, modern eye-tracking systems can now accurately and unobtrusively measure eye movements and pupil dilation of the users while they are working with the systems which their usability is to be measured.…”