Abstract
Theoretically, the pulsed- and steady-pedestal paradigms are thought to track contrast-increment thresholds (ΔC) as a function of pedestal contrast (C) for the parvocellular (P) and magnocellular (M) systems, respectively, yielding linear ΔC versus C functions for the pulsed- and nonlinear functions for the steady-pedestal paradigm. A recent study utilizing these paradigms to isolate the P and M systems reported no evidence of the M system being suppressed by red light, contrary to previous physiological and psychophysical findings. Curious as to why this may have occurred, we examined how ΔC varies with C for the P and M systems using the pulsed- and steady-pedestal paradigms and stimuli biased towards the P or M systems based on their sensitivity to spatial frequency (SF) and color. We found no effect of color and little influence of SF. To explain this lack of color effects, we used a quantitative model of ΔC (as it changes with C) to obtain Csat and contrast-gain values. The contrast-gain values (i) contradicted the hypothesis that the steady-pedestal paradigm tracks the M-system response, and (ii) our obtained Csat values indicated strongly that both pulsed- and steady-pedestal paradigms track primarily the P-system response.
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Portions of these findings were presented as a poster at the 2022 the Vision Sciences Society Meeting, St. Pete Beach, Florida, USA. The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request. No funding was received for conducting this study. The authors have no relevant financial or nonfinancial interests to disclose. The experiment was not preregistered.
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Song, J., Breitmeyer, B.G. & Brown, J.M. Examining Increment thresholds as a function of pedestal contrast under hypothetical parvo- and magnocellular-biased conditions. Atten Percept Psychophys 86, 213–220 (2024). https://doi.org/10.3758/s13414-023-02819-w
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DOI: https://doi.org/10.3758/s13414-023-02819-w