Concept · psychology
Cognitive Bias
6 studies
A cognitive bias is a systematic departure of judgement from a defined normative standard. The term covers a collection of distinct measured effects with different causes and different moderators — not a single trait some people have more of.
Treating bias as one quantity licenses two mistakes that the studies here contradict: that a group showing a bias differs in kind from a group that does not, and that a bias measured on one judgement predicts bias on another. Both matter for how clinical and educational claims about 'debiasing' get read.
Can a finding about one cognitive bias generalise to other biases?
Start with the findings and their cited studies, then compare the boundaries below.
The clinical group was further along a shared distribution, not on a different one.
The bias was in what the rating scale actually captured, not in the raters' effort.
Before applying these findings
Identify the specific bias, its normative benchmark, and the comparison group. Keep different interventions and outcome measures separate.
A tension to inspect
The exercise trials here cannot be pooled into a single 'exercise reduces bias' claim. They differ in intensity, duration, outcome measure and control condition — a single session of walking or cycling against a within-subject baseline versus a multi-week table-tennis programme against a passive control that matched neither activity nor social contact.
Use the Claims tab to inspect each claim and its supporting, challenging, or qualifying studies.
Inspect source passages
Do gamblers have a general bias in perceiving control?
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
49 participants in the pathological gambling group
It consisted of 49 participants (42 men and 7 women, mean age = 40.4, SD = 11.31) who had been diagnosed of pathological gambling using the South Oak Gambling Screen Questionnaire (i.e., SOGS, see Leiseur and Blume, , Spanish adaptation by Echeburua et al., ).
The experiment was available online for 6 months
The experiment was available during 6 months at our online laboratory, http://www.labpsico.deusto.es , so that participants in both groups could access the experiment at their convenience.
Inspect source passages
Why exciting pictures look more complicated than they are
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
35 participants
A total of 35 female volunteers (ages 18–40) with normal or corrected-to-normal vision participated.
720 images
A total of 720 pictures were used in the experiment: 239 pictures were selected from the International Affective Picture System (IAPS; ) database, and were supplemented by an additional 481 pictures found on the Internet that were thematically similar to pictures in the IAPS (and were adjusted to have the same picture dimensions as the IAPS pictures).
This is a selected set of studies, not an exhaustive literature review. A watch follows covered updates in PaperFren.
Studies
6
Findings
4
5 supporting · 0 challenging · 0 qualifying citations
Open tensions
1
Currently
What we know
- The clinical group was further along a shared distribution, not on a different one.
- The bias was in what the rating scale actually captured, not in the raters' effort.
- Simplification moved felt competence, and the study did not show judgement improved with it.
- Where an effect appeared, it depended on intensity — and both trials used passive controls.
Largest unresolved question
The exercise trials here cannot be pooled into a single 'exercise reduces bias' claim. They differ in intensity, duration, outcome measure and control condition — a single session of walking or cycling against a within-subject baseline versus a multi-week table-tennis programme against a passive control that matched neither activity nor social contact.
Common misconceptions
Cognitive bias is one underlying tendency that varies between people.
The effects measured here have different moderators: illusion of control tracked gambling status, complexity ratings tracked arousal, credibility judgements tracked processing ease, and contingency judgements varied with individualist versus collectivist values. Nothing in these studies shows they index a common factor.
People with a gambling problem think about chance in a fundamentally different way.
Both gamblers and controls showed the illusion of control on the same task. The gambler group's ratings were higher (70.61 versus 57.20), a difference of magnitude within a shared effect.
Making research easier to read helps people evaluate it better.
Simplified summaries raised both perceived credibility and self-rated ability to evaluate the work. The study measured confidence, not accuracy, so it shows the easiness effect rather than improved judgement.
Related
Claim ledger
What the evidence shows
Drawn from 6 studies in this library. Mix labels say which citation roles are present; they are not a strength score. Supports means evidence for a finding; Challenges means evidence against a stated position; Qualifies marks scope.
The clinical group was further along a shared distribution, not on a different one.
Biases are graded rather than present or absent. Both pathological gamblers and controls fell for the illusion of control in an associative learning task; the groups differed in degree (mean effectiveness rating 70.61 versus 57.20), and the difference was not explained by gamblers administering the treatment more often.
The bias was in what the rating scale actually captured, not in the raters' effort.
Judgements can track how a stimulus feels rather than the property being judged. Images rated as highly arousing were consistently judged more visually complex even though algorithmic measures showed no difference in physical detail, and eye movements did not explain the effect.
Simplification moved felt competence, and the study did not show judgement improved with it.
Ease of processing inflates confidence in one's own judgement. Viewers of simplified plain-language video abstracts rated the studies as more credible and felt more confident in their ability to evaluate them than viewers of complex abstracts, while their perceived ability to decide without expert help did not significantly change.
Where an effect appeared, it depended on intensity — and both trials used passive controls.
Bias measures respond to intervention, but the dose and the outcome both matter. Moderate-intensity cycling significantly reduced immediate and general anxiety, perceived stress and depressive symptoms, while low-intensity walking lowered general anxiety without changing negative cognitive biases; a table-tennis programme reduced negative cognitive bias, which mediated a reduction in short-video addiction.
Debates
Tensions and limits
Some items are genuine disagreements on the same question. Others mark different assays, populations, or outcomes.
The exercise trials here cannot be pooled into a single 'exercise reduces bias' claim. They differ in intensity, duration, outcome measure and control condition — a single session of walking or cycling against a within-subject baseline versus a multi-week table-tennis programme against a passive control that matched neither activity nor social contact.
The exercise trials here cannot be pooled into a single 'exercise reduces bias' claim. They differ in intensity, duration, outcome measure and control condition — a single session of walking or cycling against a within-subject baseline versus a multi-week table-tennis programme against a passive control that matched neither activity nor social contact.
PaperFren reads this as a limit on how far one study travels — different assays, populations, or outcomes — not a forced fight between papers.
Timeline
How understanding moved
Study years are when the paper was published. Evidence edits are dated changes to this page's claims. Explanations are when PaperFren added a Discovery — not a claim that the science happened that day.
2026
Concept page published
Cognitive Bias
Change log
What changed
Dated edits to this page's evidence: studies added or removed from a claim, claims added or withdrawn, and new explanations tagged here. Coverage edits are distinct from reviewed research changes and corrections. Dates record PaperFren updates; study publication dates appear in the timeline.
- Coverage updated · Concept page published
Papers
6 studies in this library bear on Cognitive Bias, ordered by citations.
- Do gamblers have a general bias in perceiving control?
Pathological gamblers show a stronger illusion of control than healthy individuals even in non-gambling situations.
- Why exciting pictures look more complicated than they are
People judge emotionally exciting images as visually more complex, even when the actual visual features are not more complicated.
- How cultural values shape our sense of personal control
Individualist and collectivist values alter how people learn about control and dictate whether feeling in control influences mood symptoms.
- Does a brief workout reduce anxiety, depression, and negative thinking?
A brief moderate-intensity workout reduces symptoms of anxiety, depression, and stress while encouraging more positive interpretations of ambiguous situations.
- Do simplified animated science summaries mislead viewers?
Simplified animated research summaries make scientific findings seem more credible and leave viewers overconfident in their ability to evaluate the study, but watching a debiasing video does not reduce this bias.
- Can Playing Table Tennis Reduce Short Video Addiction?
Engaging in a 16-week table tennis program significantly reduced college students' addiction to short videos by correcting negative cognitive biases and boosting self-control.
Compare studies
Select 2–10 studies. Design and N are labels, not a ranking.
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Questions
What is still open
The exercise trials here cannot be pooled into a single 'exercise reduces bias' claim. They differ in intensity, duration, outcome measure and control condition — a single session of walking or cycling against a within-subject baseline versus a multi-week table-tennis programme against a passive control that matched neither activity nor social contact.
Ask PaperFren about Cognitive Bias
Study this conceptflashcards and short-answer questions
A clinical group scores higher on a bias measure than controls. What does that establish, and what does it not?
It establishes a difference in degree on that measure. In the gambling study both groups showed the illusion of control and the difference was in magnitude (70.61 versus 57.20), with equal rates of administering the treatment ruling out a behavioural explanation. It does not establish a qualitatively distinct reasoning style, nor that the bias caused the condition, since the design is cross-sectional.
Why is the easiness effect a problem for science communication rather than a success?
Because the outcome that moved was confidence, not accuracy. Viewers of simplified abstracts rated the studies as more credible and felt more able to evaluate them, with no evidence presented that their evaluations were better. A communication format that raises self-assessed competence without raising competence increases the chance of confident misreading.
Two exercise studies both report reduced cognitive bias. Why should they not be combined?
They share a label and almost nothing else. One tested single sessions of walking and cycling against a within-subject baseline, finding effects only at moderate intensity and none on interpretation bias for walking; the other ran a multi-week table-tennis programme against a passive control matched for neither activity nor social contact. Pooling them would average over the intensity dependence and inherit the weaker control.