Abstract
Target prevalence influences many cognitive processes during visual search, including target detection, search efficiency, and item processing. The present research investigated whether target prevalence may also impact the spread of attention during search. Relative to low-prevalence searches, high-prevalence searches typically yield higher fixation counts, particularly during target-absent trials. This may emerge because the attention spread around each fixation may be smaller for high than low prevalence searches. To test this, observers searched for targets within object arrays in Experiments 1 (free-viewing) and 2 (gaze-contingent viewing). In Experiment 3, observers searched for targets in a Rapid Serial Visual Presentation (RSVP) stream at the center of the display while simultaneously processing occasional peripheral objects. Experiment 1 used fixation patterns to estimate attentional spread, and revealed that attention was narrowed during high, relative to low, prevalence searches. This effect was weakened during gaze-contingent search (Experiment 2) but emerged again when eye movements were unnecessary in RSVP search (Experiment 3). These results suggest that, although task demands impact how attention is allocated across displays, attention may also narrow when searching for frequent targets.
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Data availability
Experiment materials and data analysis files for this study can be accessed at: https://osf.io/3q4f8/?view_only=6d20e4698184446ea411b8a9f1857ba4.
Notes
We utilize the term “spread of attention” in this paper, as our goal is not to distinguish across these various concepts but to examine how attention generally spreads across space during search as a result of target prevalence.
Both window sizes were chosen arbitrarily and were not derived the estimates of attention spread observed in Experiment 1 as Experiments 1 and 2 were conducted in the same semester.
These rates are slightly different from Experiment 1 to have equal numbers of trial types across blocks.
The medium prevalence condition yielded surprisingly fast “no window” target-absent RTs relative to the other prevalence levels, which is not consistent with most work in the LPE literature. However, it is important to also note that a performance ceiling on raw scores might be present for target-absent RTs when a small gaze window is included. Please refer to Appendix Table 1 and Figs. 14, 15 and 16 for analyses of raw scores and corresponding graphs.
We thank an anonymous reviewer for suggesting an alternative explanation: Given that the central RSVP target is more likely to appear during high-, relative to low-, prevalence searches, it is possible for the target to interfere with and thus displace the representation of the peripheral probe, resulting in lower identification accuracy. The Target Prevalence × Probe Distance interaction remains reliable even when only analyzing target-absent trials, F(2, 188) = 3.37, p = .037, ηp2 = .035, suggesting that the effect is not driven by the target displacing the representation of the peripheral shape.
Note that Wolfe (2021) suggested that, in practice, the attentional FVF and the resolution FVF could be similar to one another as observers are unlikely to attend items they cannot recognize.
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Acknowledgments
We thank Niels Dickson, Abigail Jahnke, Haley Pettingill, Amber Pham, Dilyn Stewart, and Fatima Umaña Hernandez for assistance with data collection. A portion of this research was completed in part to fulfill the first author’s doctoral dissertation requirements at Louisiana State University.
Funding
Provided by the Graduate School at Louisiana State University. This study was not preregistered.
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Pinto, J.D.G., Papesh, M.H. High target prevalence may reduce the spread of attention during search tasks. Atten Percept Psychophys 86, 62–83 (2024). https://doi.org/10.3758/s13414-023-02821-2
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DOI: https://doi.org/10.3758/s13414-023-02821-2