Abstract
Dynamics of orientation tuning in V1 indicates that computational model of V1 should not only comprise of bank of static spatially oriented filters but also include the contribution for dynamical response facilitation or suppression along orientation. Time evolution of orientation response in V1 can emerge due to time- dependent excitation and lateral inhibition in the orientation domain. Lateral inhibition in the orientation domain suggests that Ernst Mach’s proposition can be applied for the enhancement of initial orientation distribution that is generated due to interaction of visual stimulus with spatially oriented filters and subcortical temporal filter. Oriented spatial filtering that appears much early (\(<\)70 ms) in the sequence of visual information processing can account for many of the brightness illusions observed at steady state. It is therefore expected that time evolution of orientation response might be reflecting in the brightness percept over time. Our numerical study suggests that only spatio-temporal filtering at early phase can explain experimentally observed temporal dynamics of brightness contrast illusion. But, enhancement of orientation response at early phase of visual processing is the key mechanism that can guide visual system to predict the brightness by “Max-rule” or “Winner Takes All” (WTA) estimation and thus producing White’s illusions at any exposure.
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Notes
Signal of luminance contrast appeared at the edges by a faster mechanism (spatial filtering), travels with a finite speed to influence the brightness of a uniform region in its neighborhood.
Oriented Difference of Gaussian
Frequency-specific Locally normalized ODoG
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Acknowledgments
Authors are thankful to Mark E McCourt, Shaibal Saha, and Alan E Robinson for useful discussions and to the anonymous reviewers for their valuable comments and suggestions to improve the manuscript. Authors also wish to thank Supratic Chakraborty for helping in editing language of the manuscript.
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Karmakar, S., Sarkar, S. Orientation enhancement in early visual processing can explain time course of brightness contrast and White’s illusion . Biol Cybern 107, 337–354 (2013). https://doi.org/10.1007/s00422-013-0553-7
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DOI: https://doi.org/10.1007/s00422-013-0553-7