Early-Career Citation Patterns Reveal Both Achievement and Risk

A recent study by John Ioannidis of Stanford University, published in PLOS One, examined the traits of scientists who quickly attain high citation impact in their early careers. By analyzing data from hundreds of thousands of researchers across 174 scientific fields, the study sought to uncover patterns and potential warning signs among those with unusually rapid citation success.

Citation impact measures a scientist’s influence, calculated partly by how frequently their published research is cited by peers. Some scientists reach high citation status swiftly thanks to exceptional talent. However, others might achieve this through questionable means—such as data manipulation or deliberate self-citation to artificially inflate their numbers. Uncovering undetected citation manipulation could improve the scientific record’s integrity.

Ioannidis defined “precocious” citation impact as attaining top-cited status within eight years of first publication, with “ultra-precocious” reserved for those achieving it within five years. Between 2017 and 2023, the numbers in both categories rose, prompting deeper analysis. When examining 59 ultra-precocious scientists, several shared characteristics emerged. These individuals were more likely to be affiliated with institutions in less developed countries and were often active in Environmental Sciences, Energy, Artificial Intelligence and Image Processing, or Mechanical Engineering and Transports.

The study noted that ultra-precocious scientists frequently had high self-citation rates, with many relying on self-citations to maintain their top-cited status. Additionally, a substantial proportion had experienced paper retractions, although these retractions typically occurred well after the scientists had become highly cited.

These findings could help to identify scientists who may have engaged in problematic practices. Yet, Ioannidis urges cautious interpretation. Efforts to detect fraudulent or questionable behaviors should avoid biases based on an author’s geographic or demographic background. Outstanding contributions often arise from less developed countries, and structural disadvantages affect non-white, non-Western, and non-native English-speaking researchers. Moreover, rapidly developing scientific fields, the practice of listing numerous co-authors (hyper-authorship), and large collaborative projects can all contribute to early high citation rates. Each case therefore requires careful, individualized assessment.

“Precocious authors seem to be a mixture of some of the very best, outstanding scientists and some of the very worst, manipulative ones. Hopefully, this work will provide impetus to improve our ability to understand how citation gaming processes operate as the scientific literature is burgeoning with massive production of new scientific papers.”