Journal article

Publication year: 2008

Journal: Journal of Vision

Volume number: 8

Issue number: 1

ISSN: 1534-7362

Open access status: Gold

DOI Link: https://doi.org/10.1167/8.1.2

Publisher: Association for Research in Vision and Ophthalmology

Abstract: 
Studies of chromatic discrimination are typically based on homogeneously colored patches. Surfaces of natural objects, however, cannot be characterized by a single color. Instead, they have a chromatic texture, that is, a distribution of different chromaticities. Here we study chromatic discrimination for natural images and synthetic stimuli with a distribution of different chromaticities under various states of adaptation. Discrimination was measured at the adaptation point, where the mean chromaticity of the test stimuli was the same as the chromaticity of the adapting background, and away from the adaptation point. At the adaptation point, discrimination for natural objects resulted in threshold contours that were selectively elongated in a direction of color space matching the chromatic variation of the colors within the natural object. Similar effects occurred for synthetic stimuli. Away from the adaptation point, discrimination thresholds increased and threshold ellipses were elongated along the contrast axis connecting adapting color and test color. Away from the adaptation point, no significant differences between the different stimulus classes were found. The effect of the chromatic texture on discrimination seemed to be masked by the overall increase in discrimination thresholds. Our results show that discrimination of chromatic textures, either synthetic or natural, differs from that of simple uniform patches when the chromatic variation is centered at the adaptation point.

Harvard Citation style: Hansen, T., Giesel, M. and Gegenfurtner, K. (2008) Chromatic discrimination of natural objects, Journal of Vision, 8(1), Article 2. https://doi.org/10.1167/8.1.2

APA Citation style: Hansen, T., Giesel, M., & Gegenfurtner, K. (2008). Chromatic discrimination of natural objects. Journal of Vision. 8(1), Article 2. https://doi.org/10.1167/8.1.2