title: The Weber relation for position is not an artefact of eccentricity.
abstract: We have measured the spatial threshold for discriminating the length of arcs falling on isoeccentric circles in the periphery out to 4 deg. The just-noticeable-difference rises with the arc length in the range 10-500 arc min, repeating the usual finding with foveally presented straight-line stimuli. Our results do not support a recent suggestion that the Weber relation is mainly due to greater positional uncertainty in the peripheral retina.
authors.affiliation: Department of Psychology, University College London, England.
authors.forename: M J
authors.initials: MJ
authors.lastname: Morgan
authors.forename: R J
authors.initials: RJ
authors.lastname: Watt
mesh_terms: D006801:Humans; D011601:Psychophysics; D014792:Visual Acuity / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*