要旨
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Background: While specialization plays an essential role in how scientific research is pursued, we understand little
about its effects on a researcher’s impact and career. In particular, the extent to which one specializes within their
chosen fields likely has complex relationships with productivity, career stage, and eventual impact. Here, we develop
a novel and fine-grained approach for measuring a researcher’s level of specialization at each point in their career
and apply it to the publication data of almost 30,000 established biomedical researchers to measure the effect that
specialization has on the impact of a researcher’s publications.
Results: Using a within-researcher, panel-based econometric framework, we arrive at several important results.
First, there are significant scientific rewards for specialization—25% more citations per standard deviation increase
in specialization. Second, these benefits are much higher early in a researcher’s career—as large as 75% per standard
deviation increase in specialization. Third, rewards are higher for researchers who publish few papers relative to their
peers. Finally, we find that, all else equal, researchers who make large changes in their research direction see generally
increased impact.
Conclusions: The extent to which one specializes, particularly at the early stages of a biomedical research career,
appears to play a significant role in determining the citation-based impact of their publications. When this measure of
impact is, implicitly or explicitly, an input into decision-making processes within the scientific system (for example, for
job opportunities, promotions, or invited talks), these findings lead to some important implications for the systemlevel
organization of scientific research and the incentives that exist therein. We propose several mechanisms within
modern scientific systems that likely lead to the scientific rewards we observe and discuss them within the broader
context of reward structures in biomedicine and science more generally.
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