. Physical researches on sensation [by] Frank Allen [and others]. nt .660^. Up to the present time thewriter has found no wav to determine the wave-length ofthe fundamental red color with any greater precision thanthis. Another problem in color vision may be resolved fromthese curves. The cause ot the sharp division ot color-theorists into rival camps is largely the question as towhether yellow is a simple or a compound sensation. Inpuritv of appearance it apparcnrlv demands recognition 23 AMERICAN JOURNAL OF PHYSIOLOGICAL OPTICS • as a primary sensation as much as red or green. Thecurves for
. Physical researches on sensation [by] Frank Allen [and others]. nt .660^. Up to the present time thewriter has found no wav to determine the wave-length ofthe fundamental red color with any greater precision thanthis. Another problem in color vision may be resolved fromthese curves. The cause ot the sharp division ot color-theorists into rival camps is largely the question as towhether yellow is a simple or a compound sensation. Inpuritv of appearance it apparcnrlv demands recognition 23 AMERICAN JOURNAL OF PHYSIOLOGICAL OPTICS • as a primary sensation as much as red or green. Thecurves for the colors .65Im, .625^. .620m, .589*. and .577**, allof which lie in the orange and yellow regions, are of preciselythe same character as that shown in Fig. 11. Since the yellowfatiguing colors affect the red and green sensations in thesame manner and to the same degree as do the orange colors,they must be of the same fundamental nature. That is,yellow must be a compound sensation. Surely experimentslike these, which any one may perform for himself, are more. •50 -60 M/ai/e Length. Figure I4. Retina Fatigued with a Transition Color. 24 PRIMARY COLOR SENSATIONS ALLEN — t \ 1 r-^ J -J ■a175^ \ \ L o f ^ \ J ? \ — \ / 1 Mct i 1 t^-L^ L^^. i>.^ >TICU 1 10 i ••onu ^-h-T- i 1 A AVE lCHGTHS <*0/^ -. 1 60 1 ! 70 ; Figure 15. Retina Fatigued with a Deep-blue Color. to be relied upon in determining the nature of the sensationof yellow than dogmatic assertions based on its mere appear-ance. When the green colors .560^, .540^ and .C^o^, were usedto fatigue the retina persistency curves of the same tvpewere obtained exhibiting one elevation in the part correspond-ing to green, the two ends of the spectrum coinciding withthe normal. This is clearly shown in that obtained for thewave-length .540^ which is exhibited in Fig. ij;. When wecompare the double elevation curves of the tvpe of Fig. ilwith those of the single elevation curves of Fig. 13, it isevident t
Size: 1349px × 1853px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectphysiol, bookyear1902
