Experimental
Study on Geometrical Illusions Presented Under Special Environment:
I. Effects of Continuous and Intermittent Presentations of a Homogeneously
Illuminated Hemisphere Background
T. Goto, K. Kohmura, K. Teramoto, K. Ohya, N. Maruyama, J. Kuze & S. Takahashi |
The
characteristic appearances of geometrical illusions (GIs) were investigated
under a "special environment" in which the GIs are exposed
under continuous and intermittent presentations of a homogeneous
red background (BG). Six typical GIs (Muller-Lyer, Ponzo, Delboeuf,
Ebbinghaus, Hering, and Wundt) were used in two experiments. Six
subjects were asked to report the appearances of the GIs under two
kinds of BG presentation. The apparent depth of the GI segments alternated
remarkably with the unstable localization in visual space. The general
magnitudes of illusion (MIs) represented almost normal and stable
estimations for most of the GIs. In contrast, the MIs in the GIs,
particularly those constructed by cross segments varied clearly under
the two kinds of BG presentation. These results suggest that the
factor based on the stimulus configuration is influenced little through
the BG manipulation, however, another factor based on the stimulus
presenting condition is affected under the "special environment".
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