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2009.101: Bar-like S-cone stimuli reveal the importance of an intermediate temporal filter

2009.101: Rigmor C. Baraas, Janus J. Kulikowski and Mark R. Muldoon (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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DOI: 10.1364/JOSAA.27.000766

Abstract

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 2000 > 92 Biology and other natural sciences
PACS 2003 > 87 Biological and medical physics
MIMS number:2009.101
Deposited By:Dr Mark Muldoon
Deposited On:30 January 2010

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