The Dark Side of Peer Review: Bias, Anonymity, Fairness and Ethics

The Dark Side of Peer Reviews, or Should That Be Dark Sides?

Introduction: Peer Review Is Essential, but It Is Not Perfect

Peer review remains one of the central mechanisms through which academic and scientific journals evaluate new research. Before a manuscript is published, experts in the same or a related field are usually asked to assess its originality, methodology, interpretation, clarity and significance. In principle, this system helps journals identify strong research, detect errors and improve manuscripts before they enter the scholarly record.

Yet peer review is carried out by people, and people bring assumptions, preferences, professional rivalries and personal experiences to their decisions. Reviewers may be generous or severe, cautious or adventurous, methodologically conservative or enthusiastic about innovation. Most importantly, the amount of information available to them about the authors can influence how they interpret the same manuscript.

This is why the distinction between single-blind, double-blind and open peer review matters. Each model attempts to balance independence, accountability and practical feasibility in a different way. Each also has weaknesses.

The darker side of peer review does not arise only from deliberate misconduct. Bias can be subtle and unconscious. A famous author may receive more generous interpretation, while an unknown researcher may face greater scepticism. Work from a prestigious institution may be assumed to be more reliable than equivalent work from a less familiar university. A reviewer may react negatively to a theoretical argument that challenges their own publications without consciously recognising the influence of professional rivalry.

Understanding these possibilities allows authors and editors to think more critically about how review systems work and how they might be improved.

1. What Is Single-Blind Peer Review?

In a single-blind peer-review system, the reviewer normally knows the identity of the author, but the author does not know who the reviewer is.

This has historically been common across many academic fields. The logic is straightforward: reviewers may need information about the authors to assess previous work, potential overlap, methodological history or conflicts, while reviewer anonymity allows experts to provide candid criticism without fear of retaliation.

There are genuine benefits to this arrangement. A junior researcher, for example, may feel more comfortable criticising a highly influential senior scholar if the review remains anonymous. Reviewers can identify methodological weaknesses directly without worrying that strong comments will damage future collaborations or employment opportunities.

However, single-blind review creates a significant asymmetry of information and power. Reviewers know who they are evaluating, while authors do not know who is evaluating them.

2. How Author Identity Can Influence Review

Once reviewers know who wrote a manuscript, information unrelated to the scientific content can enter their judgement.

Potential influences include:

• the author’s academic reputation;
• institutional prestige;
• country or region;
• career stage;
• professional relationships;
• previous disagreements;
• competition for funding or recognition;
• known theoretical or methodological positions.

This does not mean that reviewers deliberately discriminate whenever identities are visible. Bias can operate unconsciously. A reviewer may simply approach a famous researcher’s paper with an expectation that it is likely to be strong, while approaching an unfamiliar author’s manuscript with greater suspicion.

The same phenomenon can work negatively. An established rivalry or disagreement can make a reviewer more critical than the manuscript itself warrants.

3. The Problem of Academic Competition

Science is collaborative, but it is also competitive. Researchers compete for grants, positions, citations, invitations, prestige and priority for discoveries. Peer review places one researcher in a position to influence the publication of another researcher’s work.

Most reviewers approach this responsibility ethically. Nonetheless, the structure creates opportunities for abuse.

A reviewer might:

• delay a competitor’s paper unnecessarily;
• demand excessive additional experiments;
• recommend rejection based on weak objections;
• pressure authors to cite the reviewer’s work;
• criticise a manuscript because it challenges the reviewer’s theory;
• use confidential knowledge from the manuscript to advance their own research.

Such behaviour violates the principles of responsible peer review, but anonymity can make it difficult for authors to know whether professional competition played a role.

4. Reputation Bias Can Work in Both Directions

Author identity can produce both favourable and unfavourable bias.

A highly regarded scientist may benefit from a “halo effect.” Reviewers recognise the name, assume competence and interpret unclear details generously. They may be more willing to believe that an unusual result is important rather than erroneous.

An unknown researcher may receive no such benefit.

Conversely, a prominent scholar whose previous work has attracted controversy may face reviewers who already hold strong opinions about them. A new manuscript can become entangled in old academic disputes.

In both situations, the ideal of judging the research independently is weakened.

5. Institutional Prestige Can Affect Perception

The institution attached to an author's name may also shape expectations. Reviewers may consciously or unconsciously assign greater credibility to work from internationally recognised universities, laboratories or research institutes.

Researchers at smaller, newer or less familiar institutions may therefore worry that their work is judged more harshly.

This is one reason double-blind review appeals to many authors. Removing author names and affiliations theoretically reduces the opportunity for institutional prestige to influence the first evaluation of the work.

6. What Is Double-Blind Peer Review?

In double-blind review, neither the authors nor the reviewers are formally told each other’s identities.

Authors usually prepare an anonymised manuscript by removing:

• names;
• affiliations;
• contact details;
• acknowledgements that reveal identity;
• funding information where necessary;
• obvious references to the authors’ institution or previous work.

A separate title page containing author information is then supplied for the editorial office.

The purpose is not to make authors permanently anonymous. It is to reduce the influence of identity during the evaluative stage.

7. Why Double-Blind Review Can Be Attractive

The central argument for double-blind review is simple: if reviewers do not know who wrote the paper, they have fewer opportunities to evaluate it according to reputation, institution or personal history.

Potential advantages include:

• reduced prestige bias;
• less opportunity for personal rivalry to influence judgement;
• greater confidence among early-career researchers;
• reduced institutional or geographic stereotyping;
• stronger emphasis on the manuscript itself.

Theoretically, a manuscript from a doctoral student at a small university should enter the review process on the same footing as one written by a famous professor at an elite institution.

8. Double-Blind Does Not Mean Truly Anonymous

The major limitation is that anonymity is often imperfect.

In specialised fields, reviewers may be able to infer authorship from:

• the subject of the research;
• a unique dataset;
• specialised equipment;
• distinctive methods;
• previous conference presentations;
• preprints;
• self-citations;
• writing style.

If only a handful of laboratories in the world use a particular technique, removing author names may do little to conceal identity.

Double-blind review therefore reduces some identifying information; it cannot guarantee genuine anonymity.

9. Self-Citation Presents a Particular Challenge

Authors often need to cite their own earlier work. Removing those references entirely can damage the literature review and make the manuscript scientifically incomplete.

Some journals instruct authors to replace identifying phrases such as “in our previous study” with neutral wording, while retaining the citation itself. Others request temporary placeholders for certain references.

Authors should follow the journal's anonymisation instructions exactly. Excessive attempts to hide identity can make the paper awkward or even academically misleading.

10. Preprints Make Blinding More Difficult

The growth of preprint publication adds another complication. If a manuscript has already been uploaded to a public preprint server, a reviewer can potentially identify its authors by searching the title, topic or distinctive phrases.

This does not make double-blind review meaningless, but it shows why the system should be understood as reducing identity cues rather than eliminating them completely.

11. Can Double-Blind Review Reduce Unfair Reviews?

It can plausibly reduce unfairness that depends directly on knowing who the author is.

A reviewer cannot deliberately punish a particular academic rival if they genuinely do not know that the rival wrote the manuscript. Nor can they favour a famous researcher simply because of the name on the title page.

However, anonymity cannot remove intellectual competition. A reviewer may recognise that the paper challenges their own theory or competes with their research programme even without recognising the authors.

The reviewer may still respond defensively to the content itself.

Double-blind review therefore addresses one source of bias, not every source.

12. Scientific Bias Can Exist Without Personal Bias

Some of the most difficult peer-review disagreements arise not from personalities but from genuine intellectual commitments.

A reviewer may strongly favour:

• quantitative over qualitative methods;
• one statistical framework over another;
• a particular theoretical school;
• one interpretation of a disputed body of evidence.

Such preferences can influence assessment even if the manuscript is perfectly anonymous.

The solution therefore cannot rest solely on hiding identities. Editors must choose reviewers carefully, seek multiple perspectives where necessary and evaluate reviewer recommendations critically.

13. The Editor Remains Crucial

Peer reviewers advise; editors decide. This distinction is essential when thinking about the darker side of peer review.

A responsible editor should not simply count reviewer votes. If one reviewer recommends acceptance and another recommends rejection, the editor must examine the reasoning behind both recommendations.

Editors should be alert to:

• personal or insulting language;
• unsupported criticism;
• unreasonable demands;
• requests for excessive self-citation;
• possible conflicts of interest;
• comments that appear unrelated to the actual manuscript.

Strong editorial oversight can therefore reduce problems under any review model.

14. What Is Open Peer Review?

Open peer review generally refers to systems in which some aspect of the identities, reports or interactions involved in review is made visible. There is no single universal model.

A journal might:

• reveal reviewer identities to authors;
• publish reviewer reports alongside the article;
• publish author responses;
• allow direct discussion between authors and reviewers;
• name reviewers only after acceptance;
• combine several of these practices.

The underlying argument is that greater transparency creates greater accountability.

15. Why Openness May Improve Reviewer Behaviour

An anonymous reviewer can write comments knowing that the author may never discover who wrote them. Open review changes that calculation.

When reviewers know their names may be associated with their reports, they may be more likely to:

• use professional language;
• support criticism with evidence;
• avoid personal comments;
• consider whether requests are reasonable;
• write reports they would be comfortable defending publicly.

Published review reports can also demonstrate the intellectual work involved in peer review and allow readers to see how a manuscript changed during evaluation.

16. The Problem with Complete Openness

Transparency also has costs. Reviewer anonymity can protect researchers who need to criticise influential authors.

Imagine a junior postdoctoral researcher reviewing a manuscript written by a senior professor who may later sit on grant panels, hiring committees or conference boards. A completely open system may make the junior reviewer reluctant to identify serious weaknesses.

The same concern can arise in small academic fields where professional relationships are unavoidable.

Open review may therefore reduce excessively harsh criticism while simultaneously increasing excessively cautious criticism.

17. Is Reviewer Anonymity Necessary for Honest Criticism?

This is one of the central questions in peer-review reform.

Supporters of anonymous review argue that scholarship benefits when reviewers can speak freely. A reviewer who identifies a serious methodological flaw should not have to worry about professional retaliation.

Critics argue that anonymity can encourage irresponsible behaviour because reviewers are protected from accountability.

Both concerns are legitimate. The challenge is to design systems that encourage frank evaluation while maintaining professional standards.

18. Reviewer Conflicts of Interest Matter Under Every System

No review model can work properly if conflicts of interest are ignored.

A reviewer should normally disclose or decline where there is a relationship that could compromise impartiality, such as:

• recent co-authorship;
• shared institutional affiliation;
• close personal relationships;
• direct supervisory relationships;
• major professional disputes;
• direct competition that prevents objective assessment.

Editors should also consider whether a reviewer has an unusually strong intellectual stake in the manuscript's conclusions.

A perfectly double-blind system cannot solve conflicts that editors fail to recognise before assigning the manuscript.

19. Reviewer Suggestions Can Create Additional Complexity

Many journals allow authors to suggest preferred reviewers or identify researchers they would prefer not to review the manuscript.

Used responsibly, this can help editors locate specialists, especially in narrow fields. Used strategically, it can create concerns about authors attempting to shape the outcome of peer review.

Authors should suggest reviewers who genuinely possess relevant expertise and have no inappropriate relationship with the research team. Non-preferred reviewers should generally be excluded only for defensible reasons such as direct competition or conflict of interest.

The ultimate choice should remain with the editor.

20. Coercive Citation Is Another Dark Side of Reviewing

Reviewers are entitled to identify important literature missing from a manuscript. However, problems arise when reviewers pressure authors to cite their own work unnecessarily.

A legitimate recommendation might explain that a specific study is directly relevant to the method or interpretation.

An inappropriate request may involve a long list of marginally related papers written by the reviewer, particularly when acceptance appears to depend on adding those citations.

Authors faced with such requests should assess each suggested reference on scholarly relevance. If a citation is not appropriate, it is acceptable to explain this respectfully in the response to reviewers and, if necessary, draw the editor's attention to the issue.

21. Excessive Reviewer Demands Can Distort a Paper

Another potential problem occurs when reviewers ask authors to transform a focused study into something far beyond its original scope.

Examples include requests for:

• entirely new experiments;
• additional participant recruitment;
• new datasets;
• major theoretical frameworks unrelated to the original question;
• large numbers of secondary analyses.

Some additional work may genuinely be necessary. However, not every reviewer preference must be implemented.

Authors should determine whether a request is essential to the validity of the conclusions or merely something that would make the study different.

22. Hostile Language Should Not Be Normalised

Peer review can be critical without being insulting. Statements such as “the authors clearly do not understand basic science” do little to improve a manuscript and may reveal more about the reviewer than the research.

Constructive criticism identifies a problem and explains why it matters:

This is firm criticism, but it gives the authors something useful to address.

Editors should intervene when reports become personal, discriminatory or abusive.

23. Authors Should Separate Harshness from Validity

Authors also have responsibilities. A review may feel unfair because it is negative, but negativity alone does not make it biased.

When receiving a difficult report, ask:

• Is the criticism scientifically valid?
• Does the reviewer provide evidence?
• Would addressing the point improve the paper?
• Is the problem the content of the comment or merely its tone?

A badly phrased comment can still identify a genuine weakness. Conversely, a politely worded comment can still be scientifically unreasonable.

Separate tone from substance before deciding how to respond.

24. When Authors Should Contact the Editor

Editorial intervention may be appropriate where a review contains:

• personal attacks;
• demonstrable factual errors central to the decision;
• obvious conflicts of interest;
• requests that appear coercive;
• incompatible demands from different reviewers;
• comments unrelated to the manuscript's scientific quality.

The author's message should remain concise and evidence-based. Accusing a reviewer of jealousy or misconduct without evidence is unlikely to help.

Instead, identify the specific concern and explain why it may prevent a fair evaluation.

25. How Authors Can Prepare for Double-Blind Review

If a journal uses double-blind review, anonymisation should be performed carefully.

Follow the journal's specific instructions, because anonymisation requirements vary.

26. How Authors Can Respond to a Possibly Biased Review

Even if you suspect bias, your response should focus on scholarly evidence.

Rather than writing:

write something such as:

If there is genuine evidence of a conflict, raise it separately with the editor.

27. No Review Model Can Replace Ethical Culture

The debate over single-blind, double-blind and open reviewing can sometimes imply that selecting the correct technical model will solve the weaknesses of peer review.

It will not.

A fair system also requires:

• ethical reviewers;
• active editors;
• clear conflict-of-interest policies;
• reasonable reviewer guidelines;
• mechanisms for authors to raise concerns;
• appropriate consequences for serious misconduct.

Review design can reduce opportunities for bias, but culture determines how people use the system.

28. Comparing the Main Peer-Review Models

29. Which System Is Best?

There is no perfect answer. Different disciplines and journals face different challenges.

Double-blind review may be particularly useful where concerns about prestige, geography or institutional bias are strong. Open review may work well in communities that value transparent scholarly dialogue. Single-blind review may remain practical in specialised fields where identities would be obvious regardless of formal anonymisation.

Hybrid systems are also possible. A journal might use double-blind review during evaluation but publish anonymous reviewer reports after acceptance, or allow reviewers to reveal their identities voluntarily.

The important issue is whether the process encourages reviewers to focus on the quality of the work and gives editors the tools to correct unfair or unprofessional behaviour.

30. Practical Advice for Authors Navigating Peer Review

Conclusion: One Dark Side or Several?

Peer review has no single dark side. Its weaknesses arise from several interacting problems: anonymity without accountability, identity-based bias, academic competition, intellectual rivalry, coercive citation, excessive reviewer demands and unequal power relationships. Different review systems address different parts of this problem.

Single-blind review protects reviewers but allows author identity to influence judgement. Double-blind review can reduce some forms of reputation, institutional and personal bias, but genuine anonymity is often difficult to maintain and intellectual conflicts remain possible. Open review increases transparency and accountability, yet it can discourage junior researchers from criticising powerful authors honestly.

The question is therefore not simply whether one side of peer review should be made darker or lighter. A fair review system depends on thoughtful editorial oversight, responsible reviewer selection, clear conflict-of-interest policies and professional communication from everyone involved.

For authors, understanding the review model used by a journal can help reduce uncertainty and improve preparation. Careful anonymisation, clear scholarly writing and calm responses to reviewer criticism cannot eliminate bias, but they make it easier for editors to evaluate disputes on their merits.

Peer review remains imperfect because scholarship itself is a human activity. Its weaknesses should be acknowledged rather than ignored, but they should also be addressed constructively. Whether journals choose single-blind, double-blind, open or hybrid models, the fundamental objective should remain the same: to ensure that research is assessed as fairly as possible according to its evidence, methods, reasoning and contribution to knowledge.

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