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A discrete magno–parvo additive model in early vision for explaining brightness perception in varying contrastive contexts

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Abstract

A varying contrastive context filter (VCCF)-based model of brightness perception has been proposed. It is motivated first by a recently proposed difference of difference-of-Gaussian (DDOG) filter. Alongside, it is also inspired from the fact that the nature evolves various discrete systems and mechanisms to carry out many of its complex tasks. A weight factor, used for the linear combination of two filters representing the magnocellular and parvocellular channels in the central visual pathway, has been defined and termed as the factor of contrastive context (FOCC) in the present model. This is a binary variable that lends a property of discretization to the DDOG filter. By analyzing important brightness contrast as well as brightness assimilation illusions, we arrive at the minimal set of values (only two) for FOCC, using which one is able to successfully predict the direction of brightness shift in both situations of brightness contrast, claimed and categorized here as low contrastive context, and those of brightness assimilation, claimed and categorized here as high contrastive context perception, depending upon whether the initial M-channel-filtered stimulus is above or below a threshold of the contrastive context. As distinct from Michelson/Weber/RMS contrast, high or low, the contrastive context claimed is dependent on the edge information in the stimulus determined by the Laplacian operator, also used in the DDOG model. We compared the proposed model against the already well-established oriented difference-of-Gaussian (ODOG) model of brightness perception. Extensive simulations suggest that though for most illusions both ODOG and VCCF produce correct output, for certain intricate cases in which the ODOG filter fails to correctly predict the illusory effect, our proposed VCCF model continues to remain effective.

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Fig. 1

reproduced from Fig. 11(g), Bakshi and Ghosh 2018). The red curve shows the step function discretization of the M channel weights where all values below a threshold of 0.35 are mapped to 0.1 and all values above 0.35 are mapped to 0.55. b The dotted curve shows intensity profile of a sine grating input stimulus and the solid curve shows the corresponding DDOG output. This stimulus corresponds to the leftmost point in Fig. 1(a) where it is pointed out with an arrow. c The intensity profile (dotted line) of an intermediate stimulus lying between sine and square gratings with the corresponding DDOG output (solid curve). This stimulus is also pointed out with an arrow in Fig. 1(a). d The intensity profile (dotted line) of a square grating stimulus with the corresponding DDOG output profile (solid line). This stimulus corresponds to the rightmost point in Fig. 1(a) and is pointed out with an arrow as well

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Data and Code Availability

The data and code are available at https://github.com/ashbakcode/Contrastive-Context-Filter-Code.

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Funding

The authors acknowledge the financial support received from TAC-DCSW-CCSD, ISI (MIU-15-18 18-21), and the Cognitive Science Research Initiative (CSRI/307/2016), Govt. of India. The authors are very grateful to Alan Robinson for providing the MATLAB code of the ODOG filter that has been used in Robinson et al. (2007), and for permitting the use of the same in the present work for the sake of comparison with the proposed VCCF model.

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Correspondence to Kuntal Ghosh.

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Communicated by Benjamin Lindner.

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Bakshi, A., Roy, S., Mallick, A. et al. A discrete magno–parvo additive model in early vision for explaining brightness perception in varying contrastive contexts. Biol Cybern 116, 5–21 (2022). https://doi.org/10.1007/s00422-021-00896-4

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