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In order for our visual system to deal with the massive amount of sensory input, some of this input is discarded, while other parts are processed [Wolfe, J. M. (1994). Guided search 2.0: a revised model of visual search. Psychonomic Bulletin and Review, 1, 202–238]. From the visual search literature it is unclear how well one set of items can be selected that differs in only one feature from target...