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Target uncertainty does not lead to more distraction by singletons: intertrial priming does
Yaïr Pinto1, Christian N L Olivers, Jan Theeuwes
1Department of Cognitive Psychology, Vrije Universiteit, Van der Boechhorststraat 1, 1081 BT Amsterdam, The Netherlands. y.pinto@psy.vu.nl
Perception & Psychophysics
|March 25, 2006
Summary
Target uncertainty in visual search amplifies distractor effects, but this is due to intertrial priming, not strategic shifts in attention. Automatic priming mechanisms, enhanced by attentional competition, drive these effects.
Area of Science:
- Cognitive Psychology
- Visual Perception
- Attention Studies
Background:
- Singleton distractors can impede visual search performance.
- Target uncertainty may exacerbate distractor interference.
Purpose of the Study:
- To investigate the mechanisms behind increased singleton distractor interference under target uncertainty.
- To determine if target uncertainty leads to strategic attentional adjustments.
Main Methods:
- Two experiments involving visual search tasks with pure and mixed blocks.
- Manipulation of target and distractor identity across trials.
- Analysis of reaction times to measure interference effects.
Main Results:
- A color singleton distractor caused greater slowing in mixed blocks (uncertain target identity) compared to pure blocks (certain target identity).
- This increased interference was solely attributable to intertrial priming effects.
- Priming occurred when target and distractor identities swapped or when only the target identity changed.
Conclusions:
- Target uncertainty does not appear to induce strategic changes in attentional selection of singletons.
- Intertrial priming mechanisms, potentially enhanced by attentional competition, significantly influence singleton distractor effects.
- Visual search interference is modulated by automatic priming rather than conscious strategic control under uncertainty.