Reaction time as a function of peripheral retinal locus around fovea: effect of stimulus size.
Using targets of four sizes between 18' and 116' at a fixed luminance of 5.8 cd/m2, human visual reaction times (RT) were measured on a circle at 30 degrees eccentric to the fovea. A foveal and 12 peripheral retinal loci were explored, covering the range between 0 degrees and 330 degrees in steps of 30 degrees units on a circle about the fovea. RT decreased significantly by the stimulation to the quadrant retinal loci between nasal and superior side. RT decreased as a function of increasing target size and the amount of decrement was relatively larger in the periphery than in the fovea.
D005260:Female; D005584:Fovea Centralis / Q000502:physiology*; D006801:Humans; D008029:Lighting; D008266:Macula Lutea / Q000502:physiology*; D009949:Orientation; D011930:Reaction Time; D012160:Retina / Q000502:physiology*; D012858:Size Perception; D013028:Space Perception; D013997:Time Factors; D014796:Visual Perception