Karmakar S, Sarkar S, 2011, "Role of orientation enhancement at early phase of visual processing to generate simultaneous brightness contrast and White's illusion" Perception 40 ECVP Abstract Supplement, page 200
Role of orientation enhancement at early phase of visual processing to generate simultaneous brightness contrast and White's illusion
S Karmakar, S Sarkar
A ‘Mexican hat’ orientation distribution (Ringach et al, 1997 Nature 387 281–284; Ringach, 1998 Vision Research 38 963–972) at an early phase of visual information processing (59–78 ms) in V1 can emerge due to lateral inhibition in the orientation domain (Blakemore et al, 1970 Nature 228 37–39). Lateral inhibition in orientation domain suggests that Ernst Mach’s proposition can be applied for the enhancement of initial orientation distribution which is generated due to interaction of visual stimulus with spatially oriented difference of Gaussian filters and temporal filter. In this study, we have introduced time dependent derivative filtering in orientation domain and enhanced the initial orientation distribution following Mach’s proposition. Since orientation response at early phase of brightness processing (58–117 ms) is responsible for producing brightness induction in a square grating and White’s stimulus (Robinson and de Sa, 2008 Vision Research 48 2370–2381; McCourt and Foxe, 2004 NeuroReport 15 49–56), our numerical study suggests that enhancement of orientation response at early phase of visual processing can guide visual system to predict the brightness by ‘Max rule’ or ‘winner takes all’ (WTA) estimation and thus producing brightness illusions (eg White’s illusions and simultaneous brightness contrast) which appear at the extreme ends of the brightness continuum.
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