APPLYING THE AHP APPROACH TO EVALUATE HUMAN SENSITIVITY TO CHROMATIC LIGHT

The difference threshold of judging chromatic light was evaluated in t his study. The experimental factors included target colour, background colour, interspacing, target surface interferences, and luminance lev el. Results showed that humans were more sensitive to green light than to red or blue light. The differential brightness sensitivity was hig her for dark target on bright background than for bright target on dar k background. The interspacing between two targets also affected diffe rential brightness sensitivity, but the luminance level of the standar d stimulus was found to have no effect on difference threshold. In add ition, there was significant individual differences in differential br ightness sensitivity. Further, by comparing the results obtained from the Analytic Hierarchy Process (AHP) and the method of constant stimul i, it suggests that the AHP approach was a valid and effective method to assess difference threshold.