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Spectral Sensitivity of the Sooty Mangabey

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Spectral Sensitivity of the Sooty Mangabey Spectral sensitivity of the Sooty mangabey CALVIN K. ADAMS AND ARTHUR E. JONES1 us ARMY MEDICAL RESEARCH LABORA TORY, FORT KNOX, KENTUCKY Purkinje shift and scotopic and photopic spectral sensitivi­ 10-20 cps (Hecht & Shlaer, 1936). This is supposedly ty functions were determined for four Sooty mangabeys and due primarily to two factors: (I) the rods are more five human controls using a j1icker technique in a four-chDice sensitive to short wavelength light than the cones, discrete trials task. ResuHsindicate a Purkinje shift similar and (2) at low frequencies the rods are primarily in magnitude and frequency locus to that of human controls. the functioning receptors; at high frequencies, the Scotopic spectral sensitivity was almost identical to that of rods can no longer follow, so the cones dominate. human controls, although both species showed reduced sensi­ When one repeats this procedure using long wave­ tivity relative to the standard CIE function, -at short wave­ length light, the resulting curve should be continuous lengths. Photopic spectral sensitiVity disclosed enhanced since the two systems have about equal sensittvtty sensitivity in the blue and reduced sensitiVity (0.3-0.4 log in this region of the spectrum. If white light is used, units) in t~e redrelative to human cOfltrols. the results should be intermediate between the pre­ vious two because all wavelengths are present. Once Several recent reports have indicated that there the presence of a duplex retina has been established, are marked similarities between the visual function­ one can then determine the spectral sensitivity of ing of certain infrahuman primate species and man. each component by selecting a flicker frequency that These similarities relate not only to normal human falls clearly in the domain of that component and de­ trichromatic vision. but also to at least one of the termine cff as a function of intensity across several defective forms (protanomaly) as well. It would thus spectral loci. seem that because of these marked similarities. the use of infrahuman primates in the investigation of METHOD the mechanisms of human color vision should be Subjects particularly fruitful. The present report Is one of a Four adolescent Sooty mangabeys (Cercocebus lor­ planned series of behavioral. physiological. and ana­ quatys atys) with no previous test experience served tomical studies of the mangabey and other species. as Ss , Three were male, one female. The human con­ with the aim of obtaining a better understanding of trol Ss were five young adult men with normal color human color vision by providing a broader comparative vision (as determined by the Farnsworth-Munsell basis on which to interpret visual function. 100-Hue test). The mangabey was chosen because this species supposedly has the highest cone density of any primate Apparatus species reported (Polyak, 1946). This characteristic The testing situation was a four choice discrimina­ might well offer some unique advantages. Regardless, tion in which S had to discriminate one flickering these animals are docile compared to Rhesus ma­ stimulus from three steady ones under dark adapted caques. so this characteristic alone makes them conditions. Four stimulus beams taken from two attractive. tungsten ribbon-filament lamps were each passed The specific purpose of the present study was to through separate circular diffusing windows 1-1/16 determine. using a flicker technique. if this species in. in diameter in the light-tight testing chamber. has a functionally duplex retina and, if so, the relative On each trial one of the beams was interrupted at a spectral sensitivities of the two components. Human point aperture by a movable episcotister which had controls were run so that direct comparisons to man interchangeable discs, all of which yielded a light­ could be made. dark ratio of 1:1. Correction for Talbot brightness The flicker technique utilized in the present study (0.3 log ± 0.2 log units systematically varied across is based on the result of numerous physchophysical windows over trials) was inserted in the three steady studies with man and has previously been success­ beams to control for brightness cues. When the mon­ fully utilized in the testing of monkeys (DeValios. key pressed the "flickering" window, it received a 1965; Jacobs. 1963). 97 mg dextrose pellet from the food cup below that The theory and procedure for determining if the window. Between trials all beams were interrupted species under test has a duplex retina, and if duplex, by a movable beam block. Vertical restraining bars the relative sensitivities of each component, is as 6 in. behind the four stimulus windows restricted the follows: Using short wavelength light, one determines retinal subtense of each window to a maximum of 100 • the intensity required for cff at different flicker All surfaces of the interior of the test chamber were frequencies. If the species has a duplex retina similar flat black. to man's, the resulting curve will have a distinct The intensity and spectral composition of each of ''break'' (Purkinje shift) in it in the neighborhood of the four beams were controlled by Wratten No. 96 Perception & Psychophysics. 1967. Vol. 2 (10) Copyright 1967, Psuchonomic Press, Goleta, Calif. 419 neutral density filters and Kodak Wratten color filters, The human sa were run under the same general respectively. The eight color filters used for the conditions as the monkeys, except that a verbal re­ spectral sensitivity functions were Nos. 98, 75, 45+58, sponse and verbal knowledge of results were given. 74, 73, 72b, 29, and 92. Filters No. 45 and 29, plus Purkinje shift was determined using white light, and white light, were used for the Purkinje shift deter­ at spectral loci of 486 nm and 630 nm across five minations. Wavelength specification of each of the flicker frequencies, 10-30 cps. Scotopic sensitivity single filters was the dominant wavelength for illu­ functions were determined using 10 cps flicker, and minant A given by the manufacturer. The wavelength photopic sensitivity functions using 25 or 30 cps specification for the 45+58 combination was 510 nm, flicker, at eight spectral loci. which was the locus of maximum transmission of the combination. Spectral transmission of each of the RESULTS filters was determined with a Cary Model 11 spectro­ Purkinje Shift photometer. The spectral energy distribution of the The individual functions in Fig. 1 show the results tungsten ribbon filaments (operated at 6 V 18 A) of the three determinations of Purkinje shift for each was taken as that of a black body at 30000K, the com­ animal. All show a clear rod-cone break with the 486 puted color temperature for that voltage and amperage. nm filter, indicating a duplex retina. The frequency From these data the density correction required for locus of this shift was between 15 and 20 cps for each filter to produce an equal energy spectrum was Animals 2 and 3, and between 20 and 25 cps for Ani­ determined. mals 1 and 4. No significance is attached to this frequency difference, as the human controls showed Procedure comparable variability in shift frequency (three The objective at each wavelength-flicker frequency showed a shift between 15 and 20; two showed a shift combination was to determine that intensity of light between 20 and 25 cps). Comparable data on macaque at which S's ability to discriminate the flickering and Cebus (DeValois, 1965) show a shift between 20 stimulus from the three steady ones reached the 50% and 25 cps, while for the squirrel monkey, the shift point. is between 15 and 20 cps (Jacobs, 1963). As expected, The method of constant stimuli was used. For each the results for the 630 nm filter show no rod-cone wavelength-flicker frequency combination, five light break, and the result for white light are intermediate intensities spaced 0.3 log units apart were selected between those for the two color filters. such that percent correct responses ranged from near perfect to chance (25%). Five-trial blocks at Scotopic Function each of these intensities, in random order, were given The individual scotopic functions are shown in on each of four sessions. The data for the four ses­ Fig. 2 (10 cps curves) and summarized and compared sions were then averaged and an intensity by percent cc 1 CC2 correct response function drawn. The intensity yield­ »f ::/ i ing 50% correct responses was then determined by " J ,/ interpolation, corrected for energy transmission for IS I' that particular fUter, and used as the measure of /'/1:' ( performance for that animal at that wavelength-flicker 10 .;:/_~( ,/',.. frequency combination. / Testing was conducted five days each week with IS ,, .' lC i -, ':.- 6». ..... ":-WltlllllGHl one session per day. The session on the first day v \/ :-6• .- >- / v 10 j ,.- , of each week was considered as a warm-up to stabilize ! :::l performance; only data from the last four days each S week were utilized in tabulations. Each session con­ ~ CC3 CC4 fll » ,. sisted of either 100 trials (sensitivity functions) or '" n i 125 trials (Purklnje shift problems). The sequence ~ i' in which each spectral locus or frequency was tested IS /' , was counterbalanced over sessions. // II r S was allowed to dark adapt a minimum of 10 min •• ./0 I~ Wlll1lllGIIl before testing was begun. Trials were run 15-20 sec "y, v :' I'' IS .. ," apart with S allowed a maximum of 10 sec within r ,-:--6». \ / : which to respond (latencies were almost always less /-;:6)0_-. / !'WllI1IlIGH1 j than 5 sec). Location of the positive stimulus was 10 varied according to a predetermined random order, .6.0 ·S.O ·U .1.1 ·1.0 -1.D U ·u -S.O .6.0 -11 .l.O~- with the restriction that all windows were positive lOG RELATIVE INTENSITY an equal number of times (over all trials) and that Fig.
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