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01-03-2006 | Original Article

Visual search for a motion singleton among coherently moving distractors

Auteurs: Ulrich Ansorge, Ingrid Scharlau, Kirsten Labudda

Gepubliceerd in: Psychological Research | Uitgave 2/2006

Abstract

In the current study, we tested whether search for a visual motion singleton presented among several coherently moving distractors can be more efficient than search for a motion stimulus presented with a single distractor. Under a variety of conditions, multiple spatially distributed and coherently moving distractors facilitated search for a uniquely moving target relative to a single-motion-distractor condition (Experiments 1, 3, and 4). Color coherencies among static distractors were not equally effective (Experiments 1 and 2). These results confirm that humans are highly sensitive to antagonistically directed motion signals in backgrounds compared with spatially more confined regions of visual images.

vorige artikel Perceptual or motor learning in SRT tasks with complex sequence structures

volgende artikel Intentional pre-cueing does not influence the Simon effect

It could be argued that, under these conditions, neither the target nor the distractor qualifies as a singleton because both of these stimuli are not presented among homogenous nonsingletons. However, functionally the outcome would be very similar. There would be no advantage for the processing of the target relative to that of the distractors due to the singleton status of the former compared with the latter.

Alpha levels of the t-tests were Bonferroni-adjusted (Hays, 1988), except where noted otherwise.

Search times from single-motion-distractor conditions were not included in the regression analysis. To determine whether search time decrements with coherently moving distractors are an all-or-none process, estimates from the multiple distractor conditions alone provide a more appropriate test.

In fact, our manipulation of heterogeneity in Experiment 4 was inspired by the effects of distractor start positions on perceived induced target motion.

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Titel: Visual search for a motion singleton among coherently moving distractors
Auteurs: Ulrich Ansorge
Ingrid Scharlau
Kirsten Labudda
Publicatiedatum: 01-03-2006
Uitgeverij: Springer-Verlag
Gepubliceerd in: Psychological Research / Uitgave 2/2006
Print ISSN: 0340-0727
Elektronisch ISSN: 1430-2772
DOI: https://doi.org/10.1007/s00426-004-0194-5

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