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° eccentric to the fovea. A foveal and 12 peripheral retinal loci were explored, covering the range between 0° and 330° in steps of 30° 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.
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