Effects
of Form in Koffka-Ring Type Patterns (1): Comparison Between Hue
and Brightness Contrasts
S. Takahashi, M. Ito, T. Hanari & S. Nakamura |
The
purpose of this study is to examine the effects of figural unity
of non-annular test figure (TF) on simultaneous hue and brightness
contrasts in Koffka-ring type patterns. To manipulate the TF's unity
systematically, we investigated two stimulus conditions (five degrees
of separation and two styles of division) of the TF. Eight subjects
measured, through matching, the apparent hue and brightness of the
TF overlapping red-green or black-white inducing figures. The results
revealed that the magnitudes of hue and brightness contrasts (MHCs
and MBCs) in divided and undivided TFs decreased as the degree of
separation decreased. However, both MHCs and MBCs in the undivided
TFs decreased more steeply than those in the divided TFs. In conclusion,
the MHCs and the MBCs were significantly influenced by the separation
and the division of the TF in almost the same manner, and the effects
of dividing line on perceiving the figural unity were discussed.
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