Wonder of Color vision

Color Constancy

You may perceive RED of the apple even when bluish filter overlaps. This ability to recover the surface color despite illuminant change is called as color constancy. Understanding the mechanisms mediating color constancy is one of the central topics in the color vision research field.

Color Transparency

You may find the opaque item among transparent items immediately after the checker-patterned background appears. Mechanisms underlying this perceptual transparency are thought to be in the relatively early stage in the visual pathway and similar to those for achieving color constancy.

Material Perception

Every object in the world is made of a certain material and we usually can imagine what material it is just by looking. It is understood that the human is easily judging the feature of material feeling on the surface that consists of an extremely complex optical phenomenon. In this study, therefore, aims to reveal the mechanisms of the material perception in the visual system by a series of visual search experiments.

Cast Shadow

This study aims to investigate how visual system solves a correspondence problem between an object and its cast shadow by a series of psychopysical experiments. We created the animations with one object (a ball) and two cast shadows in which trajectory and motion of the cast shadows and an object were manipulated. Most subjects perceived that the cast shadow closest to a ball as a ball's shadow. However, when object or cast shadow were blinking, correspondence between the ball and the cast shadow depends on such a dynamic feature rather on a relative distance between the ball and the cast shadow.