. Physical researches on sensation [by] Frank Allen [and others]. here the curve obtained afterstimulation is above the normal, it shows that that color has becomephysiologically less bright, and that the corresponding color sensalionhas been depressed in sensitiveness; where it is below the normal, itindicates that the color has become physiologically brighter thannormal, and therefore that the color sensation is enhanced. By tliismethod, wliich is adopted throughout this paper, all the curves obtainedafter stimulation with one color at dirftrcnt intensities can be arrangedfor comparison in a
. Physical researches on sensation [by] Frank Allen [and others]. here the curve obtained afterstimulation is above the normal, it shows that that color has becomephysiologically less bright, and that the corresponding color sensalionhas been depressed in sensitiveness; where it is below the normal, itindicates that the color has become physiologically brighter thannormal, and therefore that the color sensation is enhanced. By tliismethod, wliich is adopted throughout this paper, all the curves obtainedafter stimulation with one color at dirftrcnt intensities can be arrangedfor comparison in a single figure. EFFECTS OF RETINAL STIMLLAriON When the left eye was stimulated with the color .687/i of an intensity(7=) corresponding to a point in the lower branch of the graphin Fig. 2, depression of the receptors of all three fundamental sensationsin the right eye was produced, a result which is exactly in accordancewith the Fechner The curve obtained is that marked .1 inFig. 4. When the right eye was stimulated with the same color, but of a. 2= / y-ii\ttnitty 1=0/7?^-intensity j-oin /= oof 61=0 Ol9i^ 1= Iy-irXtt\%;f 1=0111 I -O OlS • -ifS -SO SS ••6o hs To IS Fic. 4. Direct and refiex effects of stimuUuing the right and left eyes viJh thewave Ungth .6S7n at different intensities. 390 Frank Allen [ & , 13 slightly greater intensity (7 = ), a similar curve, Z), Fig. 4, wasobtained. When the intensity of the stimulus was raised from to ,but still corresponding to the lowest branch of the Porter graph, thesame type of curve, £, Fig. 4, resulted, though the elevations abovethe normal are not as high as those in curve D. The three curves have one elevation extending from the beginningof the red to about wave length .590ju, and a second extending fromthat point over the rest of the spectrum. The second elevation showsindications of being composed of two parts corresponding to the greenand violet regions of the sp
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphysiol, bookyear1902
