Effects
of Form in Koffka-Ring Type Patterns (2): Examination of Area-Ratio
of test Figure to Inducing Figure in Hue Contrast
T. Hanari, M. Ito, S. Takahashi, S. Nakamura, H. Nonami & T. Goto |
This
study examined how the area-ratio of a non-annular test figure (TF)
to an inducing figure (IF) affected simultaneous hue contrasts in
Koffka-ring type patterns. We manipulated three stimulus conditions
(three degrees of area, three degrees of joint-ratio, and two states
of division) of the TF, systematically. Four subjects were asked
to report, through matching, the apparent hue of the 'T"F overlapped
on the red-green IF. The results revealed that the magnitudes of
hue contrast (MHCs) decreased significantly as the TF's area increased
in the divided TFs, 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 contrast in Koffka-ring type patterns independently
of changing the area-ratio, while the effects of the area were produced
only in the divided TF. Key words: simultaneous hue contrast, Koffka-ring type pattern, area-ratio, joint-ratio, division |