Ironic capture: top-down expectations exacerbate distraction in visual search

Huffman, Greg; Rajsic, Jason; Pratt, Jay · 2019 · Crossref

DOI: 10.1007/s00426-017-0917-z

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Summary

This paper investigates "ironic capture" in visual search, a phenomenon where top-down expectations regarding a distractor’s location exacerbate attentional distraction rather than mitigating it. The authors address the question of whether observers can intentionally inhibit a known distractor to improve search efficiency. While previous research suggested that distractor inhibition is possible, those studies often relied on implicit learning or cues that allowed participants to attend to non-distractor locations. This study isolates top-down control by testing if explicit foreknowledge of a salient distractor’s location leads to successful inhibition or ironic processing, where the attempt to ignore the distractor results in increased attentional capture. The researchers conducted three experiments using an additional singleton paradigm. Participants searched for a shape singleton (a circle among squares) while ignoring a color singleton distractor. Experiment 1 explicitly informed participants that the color singleton would move predictably clockwise around the display, instructing them to ignore it. This was compared to conditions where the singleton was absent, static, or randomly located. Experiment 2 replicated this design but withheld information about the singleton’s predictable movement to test if the effect was due to implicit statistical learning. Experiment 3 controlled for block order and cognitive load, and verified whether participants actively used the location foreknowledge by asking them to predict the distractor’s next location at the end of the block. The results demonstrated that explicit foreknowledge of a distractor’s location increased response times (RTs). In Experiment 1, RTs in the predictable condition (734 ms) were significantly slower than in the random condition (675 ms), indicating that attempting to inhibit the known distractor ironically increased its interfering influence. Experiment 2 found no significant difference between predictable and random conditions when participants were not informed of the pattern, ruling out implicit statistical learning as the cause. Experiment 3 confirmed that the cost was specific to participants who successfully tracked and attempted to use the distractor’s location; those who did not use the strategy showed no significant difference between predictable and random conditions. Furthermore, the static singleton condition did not incur a cost, suggesting that repeated exposure allows visual memory to bias attention away from the distractor without active inhibition. These findings conclude that top-down expectations can exacerbate distraction in visual search. When observers attempt to actively inhibit a salient distractor based on explicit foreknowledge, they ironically increase attentional capture, leading to slower performance. This suggests that the human cognitive system struggles with purposeful inhibition of known stimuli, supporting the theory of ironic processing in perceptual tasks. The study highlights a limitation in voluntary attentional control, indicating that knowing where a distractor will appear does not necessarily help ignore it and may instead draw attention to it.

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Topics

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• visual search
• inattentional change blindness