2009.101: Elongated S-cone stimuli reveal the importance of the intermediate temporal filter

2009.101: Rigmor C. Baraas, Janus J. Kulikowski and Mark R. Muldoon (2009) Elongated S-cone stimuli reveal the importance of the intermediate temporal filter.

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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.

Available Versions of this Item

• Bar-like S-cone stimuli reveal the importance of an intermediate temporal filter (deposited 30 January 2010)
  • Elongated S-cone stimuli reveal the importance of the intermediate temporal filter (deposited 14 December 2009) [Currently Displayed]

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