| Abstract |
| A tilt illusion occurs when the perceived orientation of a central stimulus is distorted by the orientation of a surrounding stimulus. This study examined how chromatic (hue) and brightness contrast information influence tilt illusion by controlling brightness and saturation across various colors. In Experiment 1, chromatic and achromatic contrast gratings were used as stimuli, whereas Experiment 2 employed equiluminant chromatic gratings. The results showed that for chromatic stimuli, the tilt illusion was stronger when the central and surrounding stimuli shared the same hue, regardless of the wavelength, opponent hue, or brightness contrast. This hue similarity effect was not observed with achromatic stimuli. Moreover, the overall strength of the tilt illusion was reduced with equiluminant stimuli in Experiment 2 compared to contrast stimuli in Experiment 1. These results suggest that similar stimuli can influence tilt illusion independently of hue and brightness contrast. They also highlight the importance of processing individual attributes such as hue and brightness and the integration of these attributes into orientation perception. |
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| Key Words |
| 방위 지각, 기울기 착시, 색, 밝기, 유사성, Orientation Perception, Tilt Illusion, Color, Brightness, Similarity |
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