Abstract
In two visual search experiments, the detection of singleton feature targets redundantly defined on multiple dimensions was investigated. Targets differed from the distractors in orientation, color, or both (redundant targets). In Experiment 1, the various target types were presented either in separate blocks or in random order within blocks. Reaction times to redundant targets significantly violated therace model inequality (Miller, 1982), but only when there was constancy of the target-defining dimension(s) within trial blocks. In Experiment 2, there was dimensional variability within blocks. Consistent with Experiment 1, constancy of the target-defining dimension(s), but this time across successive trials (rather than within blocks), was critical for observing violations of the race model inequality. These results provide evidence for parallel-coactive processing of multiple dimensions, consistent with thedimension-weighting account of Müller, Heller, and Ziegler (1995).
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This work was supported by Deutsche Forschungsgemeinschaft Grants HE 1132/5-1 and Schr 375/8-1. We thank Asher Cohen and one anonymous reviewer for their valuable comments on a draft of this article.
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Krummenacher, J., Müller, H.J. & Heller, D. Visual search for dimensionally redundant pop-out targets: Evidence for parallel-coactive processing of dimensions. Perception & Psychophysics 63, 901–917 (2001). https://doi.org/10.3758/BF03194446
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DOI: https://doi.org/10.3758/BF03194446