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Examples of visual search stimuli with typical results. (a) A single feature search where the target is the open circle and (b) a conjunctive search with the same target. Note that it is not sufficient to find the hollow object, nor a circular object. The target is defined by a conjunction of colour and shape. (c) Typical experimental results, where the reaction times increase as a function of the number of distractors for conjunctive search but not for single-feature search.
