. Physical researches on sensation [by] Frank Allen [and others]. he color ofan intensity (7 = ) corresponding to the point where the change ofslope occurs would produce no effect of either kind. Curve B, Fig. 4,shows the reflex action obtained in the right eye after stimulation ofthe left. It is marked by three slight depressions indicating enhance-ment of the three sensations. Curve 7^, in the same figure, shows theeffect when the right eye was stimulated directly. In this case the redsensation is slightly reduced in sensitiveness, and the green and violetsensations are enhanced. Eviden
. Physical researches on sensation [by] Frank Allen [and others]. he color ofan intensity (7 = ) corresponding to the point where the change ofslope occurs would produce no effect of either kind. Curve B, Fig. 4,shows the reflex action obtained in the right eye after stimulation ofthe left. It is marked by three slight depressions indicating enhance-ment of the three sensations. Curve 7^, in the same figure, shows theeffect when the right eye was stimulated directly. In this case the redsensation is slightly reduced in sensitiveness, and the green and violetsensations are enhanced. Evidently there is an intensity of the stimuluswhich gives the transition from one type of action to the other, thoughthe intensity used was evidently a little too high. Curve F, however,shows that the reversal of actions may not occur for the three sensationsat the same intensity of stimulation. The measurements for the eight curves just discussed are givenin Table 2 for the right eye, and in Table 3 for the left. October, 1926] Variation of Visual Reflex Action 391. X 7 = ReducediV = 100 7 = a-intcnsity sec. ReducedA = 100 .740,i .720 .0242 .0251 .700 .0209 .0219 .660 .0166 .0170 .620 .0142 .0142 .5W .0131 .0136 .550 .0137 .0142 10^) 0 .530 .0147 .0152 .500 .0185 .0193 .480 .0226 .0236 .470 .0260 ia<.2 .450 .0.^04 .433 .0338 .0352 .420 .0373 ill ilu L.\i»clillKnl^ tlcscribed in the papers to which reference hasbeen made, it was found that when the right eye was stimulated withcolors from an arc light spectrum, one or two sensations were alwaysrendered less sensitive and the others enhanced. With the red )u the red sensation was depressed in sensitiveness and the greenand violet enhanced. This is shown as curve D, Fig. 8, wliich is re-produced here from the original paper. The data and reference a
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