EFFECTS OF FORM IN KOFFKA-RING TYPE PATTERNS (2) - EXAMINATION OF AREA-RATIO OF TEST FIGURE TO INDUCING FIGURE IN HUE CONTRAST

This study examined how the area-ratio of a non-annular test figure (T F) to an inducing figure (IF) affected simultaneous hue contrasts in K offka-ring type patterns. We manipulated three stimulus conditions (th ree degrees of area, three degrees of joint-ratio, and two states of d ivision) of the TF, systematically. Four subjects were asked to report , through matching, the apparent hue of the TF overlapped on the red-g reen IF. The results revealed that the magnitudes of hue contrast (MHC s) decreased significantly as the TF's area increased in the divided T Fs, whereas the MHCs remained unchanged in the undivided TFs. Further, as the degree of joint-ratio increased in different sizes of both the divided TF and the undivided TF, the MHCs were found to decrease. In conclusion, the joint-ratio of the TF affected the simultaneous hue co ntrast in Koffka-ring type patterns independently of changing the area -ratio, while the effects of the area were produced only in the divide d TF.