Bar-like S-cone stimuli reveal the importance of an intermediate temporal filter

Baraas, Rigmor C. and Kulikowski, Janus J. and Muldoon, Mark R. (2010) Bar-like S-cone stimuli reveal the importance of an intermediate temporal filter. Journal of the Optical Society of America A, 27 (4). pp. 766-780. ISSN 1749-9097

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The relative involvement of different temporal frequency-selective filters underlying detection of chromatic stimuli were studied. Diverse spectral stimuli were used, namely flashed blue and yellow light spots, wide bars and narrow bars. The stimuli were temporally modulated in luminance having constant wavelength. Although stimulus elongation apparently reduced the sensitivity at short and long wavelengths, the cone-opponent mechanism still remained responsible for the actual stimulus detection at different temporal frequencies. Stimulus elongation increased sensitivity for temporal frequencies around 3-6 Hz, revealing involvement of the intermediate temporal frequency-selective filters to detection, the so-called first transient-1 filter. A probability summation model for the method of adjustment was developed that assumes that detection depends on the properties of the temporal filters underlying the temporal frequency-sensitivity curve. The model supports the notion that at least two temporal frequency-selective filters are necessary to account for the shape of the sensitivity curves obtained for blue stimuli.

Item Type: Article
Uncontrolled Keywords: color vision, psychophysics, temporal discrimination, spectral discrimination
Subjects: MSC 2010, the AMS's Mathematics Subject Classification > 92 Biology and other natural sciences
PACS 2010, the AIP's Physics and Astronomy Classification Scheme > 80 INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY > 87 Biological and medical physics
Depositing User: Dr Mark Muldoon
Date Deposited: 30 Jan 2010
Last Modified: 20 Oct 2017 14:12

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