| Sumario: | Part of a special issue on visual attention. Two experiments were conducted to measure the effects of location-based grouping processes in visual research. Findings from spatial probes in searches for a color-shape combination suggest that a cluster of same-color or same-shape elements surrounding the target were grouped and selected together. In searches for a shape target (feature search), however, evidence for grouping is found by an irrelevant feature dimension to be weaker or nonexistent. In addition, it is found that grouping processes assisted search for a visual target by selecting groups of locations that had a common feature, although there was little or no grouping by an irrelevant feature when the target was defined by a unique salient feature.
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