Biomedical subjects

Seiyu Sohmiya

Publications and source records attributed to Seiyu Sohmiya.

3 recordsLinked to original sources

PubMed2005

Explanation for neon color effect in achromatic line segments on chromatic inducers based on the multiple interpretation hypothesis.

In van Tuijl's neon configurations, an achromatic line segment on a blue inducer produces yellowish illusory color in the illusory area. This illusion has been explained based on the idea of the complementary color induced by the blue inducer. However, it is proposed here that this illusion can be also explained by introducing the assumption that the visual system unconsciously interprets an achromatic color as information that is constituted by transparent and nontransparent colors. If this explanation is correct, not only this illusion, but also the simultaneous color contrast illusion can be explained without using the idea of the complementary color induction.

Adult↗

PubMed2004

Explanation for neon color effect of chromatic configurations on the basis of perceptual ambiguity in form and color.

Under reflected light conditions, we observed a neon color effect in a van Tuijl-type pattern for 30 combinations by pairing CMY inks. The results cannot be fully explained by Bressan's proposal as follows: (1) the illusory colors for the six configurations contradicted her predictions, (2) strong effects were not presented for complementary color pairs, and (3) for four configurations, the colors of line segments assimilated into those of the inducing patterns. Thus, the author proposes an hypothesis that the visual system treats neon color displays as ambiguous figures in form and color. This proposal can explain both illusory colors of the illusory area and those of the line segments themselves.

Color Perception↗

PubMed2003

New psychophysical method for visual consciousness during binocular rivalry: conventional method for binocular rivalry has a fatal flaw.

The alternation of dominance and suppression in a binocular-rivalry situation is involved closely in visual consciousness and unconsciousness. Therefore, binocular rivalry has recently been highlighted as a useful psychophysical phenomenon for the study of consciousness. However, we point out that the conventional method since Breese (1899) that rivalrous stimuli to the two eyes are presented simultaneously and for a long time has a fatal flaw for approaching the fundamental mechanisms underlying rivalry and, at the same time, our new method called "the suppression method" is, however, useful.

Consciousness↗