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The effect of prevalence on distractor speeded search termination

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Abstract

Visual search can be disrupted by irrelevant salient stimuli. Recently, Moher (Psychological Science31(1), 31–42, 2020) found salient distractors to speed search when a target was absent and increase error rates when the target was present. That is, distractors lowered search-quitting thresholds. Nonetheless, the salient distractors Moher used were present on 50% of all trials. Since distractor prevalence has been found to influence search processes more broadly, here, we aimed to test the effect of distractor prevalence on this distractor-quitting threshold effect (QTE). To do so, we conducted two experiments. Experiment 1 compared the performance of individuals in a search task where the target was present on 50% of trials across two distractor-prevalence conditions (25% vs. 75% prevalence). Experiment 2 followed the same procedure, except with a wider probability margin (10% vs. 90% prevalence). In Experiment 1, distractor prevalence did not modulate the QTE. Critically, in Experiment 2, the QTE was modulated. For high-prevalence distractors (90%), a QTE was observed. However, as low-prevalence distractors (10%) did not speed search, no QTE was observed. One potential reason no QTE was observed was because low-prevalence distractors have significantly greater attentional capture, which washed out speeded termination effects.

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Data availability

Data associated with the current study are found at the following link: https://osf.io/gskvu/?view_only=d44ca1f8672b4af381f4a1f7ac0bae79

Coding of the experiment and other study materials can be made available upon request. None of the experiments were preregistered.

Notes

  1. Experiments 1 and 2 used different loop types in Psychopy to assign conditions. Experiment 1 had a conditions file with 16 trials that used the Psychopy ‘random’ loop, which presents the condition file ‘N’ number of times and randomises within the file on each occasion. Experiment 2 used the ‘full random’ function, which randomises the entire list of possible trial types after combining the conditions files ‘N’ number of times.

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Correspondence to Lisa Lui.

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Approval was obtained from the ethics committee of Griffith University. The study was performed in line with the principles of the Declaration of Helsinki.

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Informed consent was obtained from all individual participants included in the study.

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The authors declare no financial or proprietary interest in any material discussed in this article.

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Lui, L., Pratt, J. & Lawrence, R.K. The effect of prevalence on distractor speeded search termination. Psychon Bull Rev 31, 303–311 (2024). https://doi.org/10.3758/s13423-023-02337-8

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  • DOI: https://doi.org/10.3758/s13423-023-02337-8

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