Visual Response Time to Colored Stimuli in Peripheral Retina

Binocular summation of chromatic changes as measured by visual reaction time

“…This test also indicated for each observer that the VRT for the right and left eye did not differ significantly ( p = .78 for J.A., p = .32 for J.M., and p = .30 for J.R.). VRT was also found to be shorter for binocular than for monocular viewing, as reported in other studies (Blake et al, 1980;Gilliland & Haines, 1975;Haines, 1977;Minucci & Connors, 1964;Ueno, 1977;Westendorf & Blake, 1988).…”

“…They were observed foveally with the natural pupil (Blake et al, 1980;Haines, 1977;Westendorf & Blake, 1988) under three conditions: right and left monocular (in this case one eye was covered with a black patch) and binocular.…”

“…The first studies (Haines, 1977;Ueno, 1977) of binocular summation using a reaction time measure for detecting a change in chromaticity found evidence of binocular summation, but the stimuli contained both achromatic and chromatic variations. Later, Trick and Guth (1980) found binocular summation with dichoptically presented monochromatic stimuli of different wavelengths.…”

The effect of pupil size on binocular summation at suprathreshold conditions

“…In accordance with a "kill the twin" procedure, [33][34][35] reactions shorter than 110 ms were discarded as false alarms while those exceeding 1500 ms were also excluded as misses. These cut-off values were similar to those used in other studies of binocular summation for luminance changes 17,25,36,37 and other studies of reaction time. 29,34,35,38 We ran a number of sessions until no fewer than 80 VRTs had been collected for each test stimulus under each experimental condition.…”

“…For both subjects (JM and JR), a three-way analysis of variance (ANOVA) showed significant differences in the main factors between the natural and artificial pupil (JM, 17,22,25,36,37,40 On the other hand, there were no differences in VTRs between the two eyes for monocular viewing (JM, right eye vs. left eye, p = 0.70; JR, right eye vs. left eye, p = 0.81). Figure 1 presents for both subjects and for each observational condition, the total VRT average on 12 experimental conditions, for natural and artificial pupils.…”