title: Reaction time measurement of receptive field properties in the human fovea.
abstract: A Westheimer -like function has been obtained for simple reaction time (RT) to target luminance increments superimposed upon homogeneous background fields. RT to a constant-luminance target progressively increases as the outer diameter of a constant-luminance background is increased up to approximately 6'-8'. Further increases in background diameter up to approximately 10'-22' then result in progressive decreases in RT. Beyond this background diameter RT remains relatively constant. The magnitude of this effect diminishes rapidly as target luminance is increased beyond a near-threshold value.
mesh_terms: D005584:Fovea Centralis / Q000502:physiology*; D006801:Humans; D008027:Light; D008266:Macula Lutea / Q000502:physiology*; D008297:Male; D010775:Photic Stimulation; D011930:Reaction Time / Q000502:physiology*; D014785:Vision, Ocular / Q000502:physiology*