title: The contrast-response of the periphery effect.
abstract: This report examines the effect of varying the contrast of a flickering remote surround on thresholds for flicker detection, and color detection in rapidly flickering red and green foveal test targets, presented on a steady white background. Flicker in the surround reduced flicker sensitivity for the foveal test stimuli and yielded a periphery effect (PE), whereas it had no effect on color sensitivity (no PE). The magnitude of the PE increased non-linearly as a function of increasing surround flicker contrast. Much of the increase took place at low contrasts (< 0.20) and half-saturation of the PE occurred at 0.16 and 0.29 contrast for the red and green targets, respectively.
authors.affiliation: Department of Optometry, University of Alabama at Birmingham 35294-0010, USA.
authors.forename: P S
authors.initials: PS
authors.lastname: Fuhr
authors.forename: T
authors.initials: T
authors.lastname: Kuyk
mesh_terms: D000328:Adult; D003118:Color Perception / Q000502:physiology*; D015350:Contrast Sensitivity / Q000502:physiology*; D005425:Flicker Fusion / Q000502:physiology*; D005584:Fovea Centralis / Q000502:physiology*; D006801:Humans; D012684:Sensory Thresholds / Q000502:physiology; D013997:Time Factors; D014794:Visual Fields