Extraction of Perceptually Salient Contours by Striate Cortical Networks

Extraction of Perceptually Salient Contours by Striate Cortical Networks (1998)

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by Shih-cheng Yen , Leif H. Finkel

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@MISC{Yen98extractionof,
    author = {Shih-cheng Yen and Leif H. Finkel},
    title = {Extraction of Perceptually Salient Contours by Striate Cortical Networks},
    year = {1998}
}

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Abstract

We present a cortical-based model for computing the perceptual salience of contours embedded in noisy images. It has been suggested (Gilbert, 1992; Field, Hayes & Hess, 1993) that horizontal intra-cortical connections in primary visual cortex may modulate contrast detection thresholds and pre-attentive "popout ". In our model, horizontal connections mediate context-dependent facilitatory and inhibitory interactions among oriented cells. Strongly facilitated cells undergo temporal synchronization; and perceptual salience is determined by the level of synchronized activity. The model accounts for a range of reported psychophysical and physiological effects of contour salience (Polat & Sagi, 1993, 1994; Kapadia, Ito, Gilbert & Westheimer, 1995; Field et al., 1993; Kovács, Polat & Norcia, 1996; Pettet, McKee & Grzywacz, 1996). In particular, the model proposes that intrinsic properties of synchronization account for the increased salience of smooth, closed contours (Kovács & Julesz, 1993, ...

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