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Growth of International Cooperation in Science: Revisiting Six Case Studies
Caroline S. Wagner, Travis Whetsell, Loet Leydesdorff
TL;DR
The study examines whether specialty-level collaboration networks reveal distinctive structures and epistemic differences. Using aggregate international-collaboration observations and impact measures, it finds continued growth, increasing connectedness, and convergence across specialties.
Problem
The study asks whether networked sub-communities reveal distinctive topological structures and whether disciplinary differences illuminate epistemic organization.
Method
The analysis uses aggregate observations of international collaboration and normalized citation-impact measures, including FWCI.
Results
International collaboration continues to grow, all specialties become more connected over time, and their network measures appear to converge.
Takeaways & Limitations
The convergence of specialty networks suggests that collaborative organization does not simply reflect distinct underlying disciplinary cultures.
Takeaways & Limitations
Regional heterogeneity remains, and observed patterns may partly reflect the initial dominance of larger, scientifically advanced nations.
Abstract
from arXiv · showhide
International collaboration in science continues to grow at a remarkable rate, but little agreement exists about dynamics of growth and organization at the discipline level. Some suggest that disciplines differ in their collaborative tendencies, reflecting their epistemic culture. This study examines collaborative patterns in six previously studied specialties to add new data and conduct analyses over time. Our findings show that the global network of collaboration continues to add new nations and new participants; each specialty has added many new nations to its lists of collaborating partners since 1990. We also find that the scope of international collaboration is positively related to impact. Network characteristics for the six specialties are notable in that instead of reflecting underlying culture, they tend towards convergence. This observation suggests that the global level may represent next-order dynamics that feed back to the national and local levels (as subsystems) in a complex, networked hierarchy.
1. Introduction
International collaboration has expanded rapidly, with higher citation impact and lessening geographic barriers, while debate remains about how collaboration differs across fields. This study revisits six specialties over time to test their network structures, growth patterns, and relationship to the global system.
- Growth and motivation: Internationally coauthored papers accounted for 25 percent of Web of Science records in 2011, up from 10 percent in 1990.The growth involves both large-scale projects and smaller projects among otherwise unrelated parties.
- Growth and motivation: Long-distance collaboration is increasing, while proximity effects and the importance of territorial borders appear to be diminishing over time.International collaboration remains costlier, but distance has become less of a barrier than in the past.
- Growth and motivation: International publications have higher-than-expected citation rates across all scientific fields.The cited literature links the added effort of international collaboration with greater citation impact.
- Disciplinary differences: The literature reports substantial variation in collaborative activity across fields, but differences may reflect data collection, analytical methods, or field definitions.Prior studies variously identify higher collaboration in Physics, Life Sciences, and related fields, and lower collaboration in Mathematics.
- Study aims: The study examines Astrophysics, Virology, Seismology, Polymers, Soil Science, and Mathematical Logic using new data and analysis, alongside all-field comparisons.It focuses on whether specialties have distinctive network topologies, different growth rates, and a relationship to the global collaboration system.
- Study aims: The paper asks whether the global collaboration network is evolving into a next-order dynamic that feeds back to national and local levels.This question connects specialty-level network structure with broader processes of knowledge creation and epistemic organization.
2. Data and Methods
The study reconstructs nation-to-nation collaboration networks for six specialties and compares their structure across multiple years. It combines network measures with mixed-effects models relating added nations to field-weighted citation impact.
- Data: Nation-to-nation collaboration data are compared for 1990, 2000, 2008, and 2013 using publications from the six specialties.The analysis also includes all publications in all fields for the years studied.
- Network construction: The researchers reconstruct collaboration matrices in which nations are nodes and publication years index the networks.Cosine-normalized weights represent publication counts for each nation-nation combination.
- Network analysis: Network size, cohesion, cliquishness, small-world structure, redundancy, openness, and local search capacity are assessed with multiple structural measures.Measures include nodes, edges, diameter, average degree, density, clustering, and betweenness.
- Impact analysis: Mixed-effects regressions estimate the marginal impact of each additional nation on field-weighted citation impact.Country combinations are modeled as random effects and year as a fixed effect, separately for each specialty and all fields.
- Impact analysis: The analysis treats the nation-to-nation collaboration instance as the observation rather than the publication.Each observation aggregates publications sharing a country-country combination, with FWCI representing its citation impact within the specialty.
3. Results
Across the six specialties, international collaboration expanded through more participating nations, denser links, and greater connectivity from 1990 to 2013. The networks generally became less centralized and more structurally cohesive, while specialties retained notable differences in internationalization and connectivity.
- Network growth: Soil Science increased its international collaboration links by 550 percent from 1990 to 2013, while all specialties increased their links by more than 200 percent.Soil Science’s participating nations more than doubled, from 40 to 100.
- Network structure: The global networks had diameters of 3 to 5, indicating that nations were tightly linked through short paths.Not every nation appeared in every specialty, but the global network connected nations through intermediate collaborations.
- Network structure: Average degree rose from 22.4 in 1990 to 73.6 in 2013, while network density increased from .13 to .30.These changes indicate substantially greater structural cohesion and connectivity among nations.
- Network structure: Centralization declined in all six specialties, while dense, redundant connections increased and power became less concentrated in a few large nodes.The United States remained dominant in Astrophysics, but larger nations generally became less critical to overall cohesion in the other fields.
4. Discussion
International collaboration continued to expand across all six specialties while network structures converged toward denser, more equitable, and similarly connected forms. The findings suggest global collaboration operates through emergent, partially nested feedback structures rather than a simple top-down hierarchy.
- Growth and participation: International collaboration grew across all six specialties, adding nations and participants over time.New entrants were not necessarily connecting directly to the largest hubs, instead potentially following regional or socioeconomic similarities.
- Network structure: Network measures indicate increasing connectivity and declining dominance by scientifically advanced countries.Average degree increased, while declining betweenness centralization supported a more equitable network.
- Convergence across specialties: The six specialties converged toward similar levels of international activity despite differing expected epistemic cultures.Astrophysics and Virology had contrasting centralized and decentralized collaboration modes but showed similar network structures and rapid growth.
- Specialty differences: Soil Science and Polymer Science showed unexpectedly strong increases in participation, while Mathematical Logic remained an outlier with lower global participation.Soil Science grew especially rapidly, and its network measures increasingly resembled those of more internationally active specialties.
- Global network dynamics: The authors interpret convergence as evidence that global networked communication may develop norms distinct from national, regional, or disciplinary cultures.Combining all specialties supported convergence and suggested an emergent global layer influencing subsystem dynamics.
- Hierarchy and heterarchy: The resulting organization is better described as a heterarchy of partially nested structures than as a classic hierarchy.Scientists can simultaneously participate in far-flung international projects and local collaborations, producing interactive feedback loops rather than strictly layered levels.
Astrophysics journals
The supplied passages enumerate journal titles associated with Astrophysics and related specialties. They include astronomy and astrophysics journals alongside mathematical logic, polymer science, seismology, and engineering titles.
- The list includes multiple astronomy and astrophysics journals, such as Astronomy & Astrophysics and Astrophysical Journal.
- The journal listings span several distinct specialty areas rather than only astrophysics.
- The passages also list journals covering mathematical logic, polymer science, seismology, and soil dynamics.
Soil Science
The supplied passage lists journals in Soil Science together with journals in agronomy, forestry, and virology. It therefore presents Soil Science within a broader set of environmental and life-science publication venues.
- The list includes major Soil Science journals such as European Journal of Soil Science and Geoderma.
- Additional titles cover agronomy, forestry, soil research, and soil management.
- The passage also includes a substantial group of virology journals, including Journal of Virology and Virology.