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Biomedical research can form bubbles, similar to financial markets, where inflated attention leads to collapses. A new diffusion index reveals that limited knowledge diffusion predicts decreased research popularity and relevance.

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Area of Science:

  • Biomedical research
  • Bibliometrics
  • Science of science

Background:

  • Scientific fields can experience periods of inflated attention, termed
  • bubbles
  • akin to financial markets. This phenomenon can lead to unsustainable hype and subsequent dramatic declines in research relevance and funding.
  • Understanding the dynamics of knowledge diffusion is crucial for evaluating the long-term impact of scientific research.

Purpose of the Study:

  • To introduce a novel diffusion index to quantify the amplification and broad evaluation of biomedical research areas.
  • To analyze the trajectories of specific research fields, such as cardiac stem cells and cancer immunotherapy, as case studies.
  • To investigate the relationship between knowledge diffusion patterns and the subsequent popularity and attention received by biomedical subfields.

Main Methods:

  • Development of a diffusion index to measure research area amplification versus broad evaluation.
  • Application of the index to track the historical development of cardiac stem cell research and cancer immunotherapy.
  • Analysis of diffusion patterns across 28,504 biomedical subfields using publication and citation data (1.9 million papers, 80 million citations).

Main Results:

  • The diffusion index successfully differentiated between research "bubbles" (e.g., cardiac stem cells) and sustained growth areas (e.g., cancer immunotherapy).
  • Analysis of a large corpus of biomedical literature revealed that limited diffusion of knowledge within specific subfields anticipates sharp decreases in their popularity.
  • Restricted diffusion, indicative of a socio-epistemic bubble, consistently preceded dramatic collapses in scientific relevance and attention.

Conclusions:

  • The diffusion index provides a valuable tool for identifying and understanding research bubbles in biomedicine.
  • Limited knowledge diffusion is a significant predictor of declining research relevance and attention, highlighting the risks of socio-epistemic bubbles.
  • Promoting broader diffusion of scientific findings may be essential for sustaining the long-term impact and relevance of biomedical research.