Feature priming in visual search does not depend on the dimensional context

Visual search is speeded when the target-defining property (a feature- or dimension difference relative to the distractors) is repeated relative to when it changes, a phenomenon referred to as intertrial priming. Feature priming is usually weaker than dimension priming, and sometimes even absent. Four experiments tested the hypothesis that feature priming effects are especially weakened when the visual search task also involves dimension changes, the idea being that feature changes become less salient or less relevant relative to the bigger dimension changes. Feature changes were embedded in blocks that only contained feature changes, or in blocks that also carried dimension changes. However, regardless of type of search task, and level of display ambiguity, the dimensional context had little to no effect on the magnitude of feature priming. There were only reliable effects of ambiguity, in line with recent proposals (Meeter & Olivers, 2006).