Attention
Do we unconsciously learn to ignore a frequent distractor colour?
Open access · cc by · source: Europe PMC
People learned to ignore a distractor in its most frequent colour, but the effect was small and short-lived, and noticing the pattern actually made it weaker.
Study at a glance
- Design
- Human experiment — Online additional-singleton visual search task: a learning phase where one distractor colour was far more frequent, then an extinction phase with equal colour frequencies; participants randomly assigned to be informed (and tested for awareness) before extinction or after it.
- N
- N=160 · 160 online participants: 82 in the informed (early awareness test) group and 78 in the uninformed (late awareness test) group.
- Population
- Adults aged 18-35 with English as their first language, recruited through Prolific.
- Outcome
- Search reaction time and accuracy for high- vs. low-probability distractor colours (colour-suppression effect) in learning and extinction phases; percentage estimates of how often each distractor colour appeared.
Structured fields used in claim comparison tables when every cited study has a complete layer.
Key findings
During learning, search was 23ms faster when the distractor had the high-probability colour, a colour-suppression effect of moderate size. Part of this reflected short-term priming from the previous trial, and in the extinction phase the reaction-time effect disappeared, leaving only a tiny accuracy benefit of no more than 1%. People tested right after learning estimated the frequent colour at 29% versus 18% for those tested after extinction, so awareness was underestimated by late testing. Crucially, in the informed group, people who were more aware of the frequent colour showed less suppression, suggesting awareness works against the learned bias rather than producing it.
Methodology
160 online participants searched for an odd shape among six items while one item was sometimes a salient colour singleton distractor. During the learning phase the distractor appeared in one high-probability colour on 65% of distractor trials and in each of four other colours on 8.75%; in the following extinction phase all colours were equally likely. Half the participants were asked to estimate colour percentages immediately after learning and were then told that the imbalance would stop, while the other half were tested for awareness only at the end and never told. The study was pre-registered.
Limitations
Because the learned bias vanished almost immediately in extinction, the study could not properly test whether people can deliberately switch it off; the informed vs. uninformed difference was only a non-significant trend. The findings concern distractor colour in a task where participants search for a known odd shape, and the authors note that learning of distractor location or in other search modes may behave differently. Testing was online with uncontrolled viewing conditions and no eye tracking, and a non-pre-registered rule automatically replaced low-performing participants. The negative awareness-suppression correlation is correlational and appeared only in the early-test group.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
Not yet placed on a claim. This paper has study layers, but no concept page yet cites it as support, challenge, or qualifier.
Related papers in this topic
Same topic cluster — not a recommendation engine.