Two male observers were administered a binocular visual response time task to small (45' arc), flashed, photopic stimuli at four dominant wavelengths (632 nm red;583 nm yellow;526 nm green;464 run blue) imaged across the horizontal retinal meridian. The stimuli were imaged at 10° arc intervals from 80° left to 90° right of fixation. Testing followed either prior light adaptation or prior dark adaptation. Results indicated that mean response time (RT) varies with stimulus color. RT is faster to yellow than to blue and green and slowest to red. In general, mean RT was found to increase from fovea to periphery for all four colors, with the curve for red stimuli exhibiting the most rapid positive acceleration with increasing angular eccentricity from the fovea. The shape of the RT distribution across the retina was also found to depend upon the state of light or dark adaptation. The findings are related to previous RT research and are discussed in terms of optimizing the color and position of colored visual displays on instrument panels.
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