Study of Interrelations between Mechanisms at Threshold*

摘要: A new method for the study of color vision is introduced where two test flashes are used in an increment-threshold experiment. Summation index defined as logarithm factor by which threshold reduced when light presented together ratio their individual radiances. When wavelength one flash fixed at 630 mμ and other varied, a summation-index curve can be drawn function second flash. This assumed to reveal interrelations between underlying mechanisms discrimination stimulated first flash, respectively. Two different durations employed curves obtained. It found that under certain conditions summation becomes smaller than predicted probability summation, suggests inhibition mechanisms. With aid experimental spectral sensitivity obtained same adapting above, interpreted with help conceptions opponent-colors theory.