Preprints, Postprints & ePrints
A preprint is an article that has not yet undergone peer review, a postprint is an article which has been peer reviewed in preparation for publication in a journal. Both the preprint and postprint may differ from the final published version of an article. Preprints and postprints together are referred to as e-prints or eprints.
Peer Reviewed vs Preprints?
Peer-reviewed research — the kind that appears in academic journals has undergone a detailed critique by scholars with expertise in the field
A preprint has not been vetted through a formal peer-review process. However, preprints tend to be more complete. Also, preprints submitted to public servers such as the Social Science Research Network and the health sciences server medRxiv get a cursory screening before they’re published online for public view.
Preprints, like academic journal articles, are assigned a Digital Object Identifier, or DOI, and become a permanent part of the scientific record.
Preprints and PubMed
Preprints are complete and public drafts of scientific documents, not yet certified by peer review. These documents ensure that the findings of the research community are widely disseminated, priorities of discoveries are established and they invite feedback and discussion to help improve the work.
Certification by peer review is the key distinction between a preprint and an accepted author manuscript or published article. Many preprints are submitted to journals for publication, and as a result, subsequent versions of the paper may also be made available after peer review. Readers of preprints should be aware that any aspect of the research, including the results and conclusions, may change as a result of peer review (see PMC Disclaimer). Authors may also revise preprints and post updated versions to the preprint server.
Preprints in PubMed
From June 2020 through June 2022, National Library of Medicine, the publisher of PubMed, made more than 3,300 preprints reporting NIH-supported COVID-19 research discoverable in PubMed Central (PMC) and PubMed recognizing that preprint records in PMC and PubMed could provide an avenue for discovery of NIH-supported research prior to journal publication during the ongoing public health emergency.
In January 2023 the NIH Preprint Pilot launched. This phase expands the scope of preprints included in PMC and PubMed beyond COVID, to include all preprints reporting NIH-funded research and posted to an eligible preprint server.
To ensure that researchers, clinicians, and the public can all easily distinguish between preprints and the journal literature, PMC and PubMed include a prominent green information panel on all preprint records. The text in this panel notes that the article has not yet been peer reviewed and includes a link to more information about the “NIH Preprint Pilot.” A “Preprint” indicator has also been added to the citation metadata and Cite tool, both on the record page and in the search results of PMC and PubMed.
Preprint Servers
Preprint servers are online repositories which enable you to post this early version of your paper online.
In most academic disciplines preprint servers are now commonly used. Among the most well known are:
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ArXiv (physical sciences) - https://arxiv.org/ (Hosted by Cornell) arXiv is an open-access archive for articles in the fields of physics, mathematics, computer science, quantitative biology, quantitative finance, statistics, electrical engineering and systems science, and economics
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medRxiv (medicine) - https://www.medrxiv.org/ (Hosted by Yale, BMJ & Cold Spring Harbor Laboratory) medRxiv accepts preprints of articles covering all aspects of research in the health sciences.
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PsyArVix (psychiatry) - https://psyarxiv.com/ (Hosted by The Society for Improvement of Psychological Science) PsyArVix accepts preprints of articles in the psychological sciences.
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Research Square (Multidisciplinary) - https://www.researchsquare.com/ (Research Square is a multidisciplinary preprint server that posts research in all scientific areas, including physical, biomedical, and social sciences)
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SocArXiv (social sciences) - https://osf.io/preprints/socarxiv (Hosted by the University of Maryland) Open archive of the social sciences
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bioRxiv (biology) - https://www.biorxiv.org/ (Hosted by Cold Springs Harbor Laboratory) Open archive of articles in the life sciences
There are equivalents Pre-Print servers for most research areas.
Keep in mind that preprints have NOT been through a formal peer review process.