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i-Perception (2011) volume 2, pages 323–323 dx.doi.org/10.1068/ic323 ISSN 2041-6695 Dissociating Goal-Directed and Stimulus-Driven Determinants in Attentional Capture Louis K. H. Chan Department of Psychology, University of Hong Kong clouis@graduate.hku.hk William G. Hayward Department of Psychology, University of Hong Kong Abstract. Although attentional capture is now a commonplace finding, the exact roles played by goal-directed and stimulus-driven determents remain elusive. An unsettled issue is on the relative contribution of attentional set and visual saliency. In the present study, we investigated this issue by mixing color and orientation search trials, so that distractors of either feature dimension fell into the current attentional set. In our test, color features were more salient. As a result, in orientation search, whereas a color distractor produced huge capture (109 ms), an orientation distractor produced moderate capture (50 ms). With color targets, distractors were not interfering. On one hand, these results reflect that relative salience of the target and the distractor is critical for producing capture; on the other hand, a huge capture size associated with a nontarget dimension feature is novel. Similar previous measurements, but without matching the attentional set, consistently report attentional capture of only 20-30 ms. This comparison shows the role played by attentional set. Taken together, we suggest that visual saliency determines search order, and sets the platform for capture. However, attentional dwell time on the distractor is determined by how much it matches the current attentional set, and in turn explains the capture size. Copyright © 2011 Louis K. H. Chan, William G. Hayward Published under a Creative Commons Licence
i-Perception – SAGE
Published: Jan 1, 2011
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