Abstract
Visual search can be disrupted by irrelevant salient stimuli. Recently, Moher (Psychological Science, 31(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.
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
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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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