Evidence Inhibition Responds Reactively to the Salience of Distracting Information during Focused Attention

Wyatt, Natalie; Machado, Liana · 2013 · OpenAlex-citations

DOI: 10.1371/journal.pone.0062809

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Summary

This study investigates the mechanism of distractor inhibition within selective attention, specifically testing whether inhibitory processing responds reactively to the salience of distracting information. The authors contrast two theoretical frameworks: the reactive inhibition hypothesis, which posits that inhibition strength is proportional to distractor intensity, and the non-reactive inhibition hypothesis, which suggests inhibition strength is independent of distractor intensity. To resolve this debate, the researchers employed a flanker task with variable distractor-target stimulus-onset asynchronies (SOAs) to measure both initial distractor interference and subsequent distractor inhibition. The experimental design comprised two experiments manipulating distractor intensity differently. Experiment 1 varied the spatial proximity of the distractor to the target (1°, 2°, or 3° separation), using colored squares as stimuli. Experiment 2 manipulated distractor luminance (brighter or dimmer than the target), using gray letters to avoid color identity confounds. In both experiments, participants identified the central target while ignoring the peripheral distractor. The paradigm allowed for the measurement of interference via positive compatibility effects at short SOAs (50 ms) and inhibition via negative compatibility effects at long SOAs (950 ms). The results provided consistent support for the reactive inhibition hypothesis. In Experiment 1, distractors positioned closer to the target elicited stronger interference at short SOAs and significantly stronger inhibition at long SOAs compared to distant distractors. Similarly, in Experiment 2, brighter distractors produced greater interference and significantly stronger negative compatibility effects (indicating stronger inhibition) at the 950 ms SOA compared to dimmer distractors. These findings demonstrate that more intense distractors trigger both increased initial interference and more robust subsequent inhibition. The significance of these findings lies in their support for models of selective attention that propose flexible, reactive inhibitory mechanisms. The data refute the non-reactive hypothesis, which would predict that stronger distractors overwhelm fixed inhibitory processes, thereby reducing observable inhibition. Instead, the results indicate that the attentional system scales inhibitory strength in proportion to distractor salience, optimizing response accuracy and speed by suppressing more potent distracting inputs more effectively. This provides novel empirical evidence for the reactive inhibition component of Houghton and Tipper’s model of selective attention.

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• attention selective divided