Visual response time to colored stimuli in peripheral retina: evidence for binocular summation

Simple onset response time (RT) experiments, previously shown to exhibit binocular summation effects for white stimuli along the horizontal meridian, were performed for red and green stimuli along 5 oblique meridians. Binocular RT was significantly shorter than monocular RT for a 45-min-diameter spot of red, green, or white light within eccentricites of about 50 deg from the fovea. Relatively large meridian differences were noted that appear to be due to the degree which the images fall on corresponding retinal areas.