Abstract
We propose a stochastic guided search model for search asymmetries. Traditional saliency-based search model cannot account for the search asymmetry. Search asymmetry is likely to reflect changes in relative saliency between a target and distractors by the switch of target and distractor. However, the traditional models with a deterministic WTA always direct attention to the most salient location, regardless of relative saliency. Thus variation of the saliency does not lead to the variation of search efficiency in the saliency-based search models. We show that the introduction of a stochastic WTA enables the saliency-based search model to cause the variation of the relative saliency to change search efficiency, due to stochastic shifts of attention. The proposed model can simulate asymmetries in visual search.
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