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Maps of random walks on complex networks reveal community structure

M. Rosvall, C. T. Bergstrom

arXiv:0707.0609v3physics.soc-phcond-mat.dis-nnphysics.data-an

TL;DR

Understanding how information flows through large, differentiated systems requires maps that highlight important structures and relationships. This paper uses information-theoretic compression of random walks to map network communities, revealing a multicentric science network with citations flowing mainly from applied to basic fields.

  • Problem

    Scientific communication forms a differentiated system whose citation flows require a map that highlights important fields and their relationships.

  • Method

    The map equation optimally compresses random walks with a two-level code to identify modules in weighted and directed networks.

  • Results

    The science map reveals data-derived field boundaries, a backbone linking medicine, molecular biology, chemistry, and physics, and predominantly one-way citation from applied to basic sciences.

  • Takeaways & Limitations

    The map makes the organization and relationships of scientific fields comprehensible without imposing a preconceived taxonomy.

  • Takeaways & Limitations

    Flow-based mapping is most appropriate for network links representing movement, whereas combinatoric methods may be preferable for pairwise relationships without flow.

Abstract

from arXiv · show

To comprehend the multipartite organization of large-scale biological and social systems, we introduce a new information theoretic approach that reveals community structure in weighted and directed networks. The method decomposes a network into modules by optimally compressing a description of information flows on the network. The result is a map that both simplifies and highlights the regularities in the structure and their relationships. We illustrate the method by making a map of scientific communication as captured in the citation patterns of more than 6000 journals. We discover a multicentric organization with fields that vary dramatically in size and degree of integration into the network of science. Along the backbone of the network -- including physics, chemistry, molecular biology, and medicine -- information flows bidirectionally, but the map reveals a directional pattern of citation from the applied fields to the basic sciences.

Network maps and coding theory

The map equation identifies community structure in directed, weighted networks by optimally compressing random-walk information flow. Its two-level coding scheme preserves network directions and weights while representing modules and their relationships at an appropriate resolution.

  • Coding theory: Random walks provide a network-derived proxy for information flow, turning the description of flow into a coding or compression problem.The random walk uses all information in the network representation and nothing more, providing a default dynamics from the network diagram alone.
  • Coding theory: The method shows that finding community structure is equivalent to solving a coding problem and applies this idea to mapping citation flows among scientific journals.An efficient code describes a random walk on the network, and the resulting science map is based on information flows among journals through citations.
  • Map construction: The map uses two description levels: unique names for large-scale modules and reused names for individual nodes within each module.This separates important structures from insignificant details while retaining fine-grain information within modules.
  • Flow-based structure: Unlike methods that discard link directions and weights, flow-based mapping retains both and accounts for their interdependence in networks characterized by flows.For structured flow, the map equation can distinguish partitions through description length; one example gives 2.67 bits/step versus 4.13 bits/step.
  • Science map: In the science map, module boundaries emerge from citation data, while directed weighted links reveal extensive citation from applied fields toward basic sciences.Citation arrows encode both flow volume and direction, with A →B meaning “A cites B.”
  • Map resolution: The appropriate module resolution depends on the network universe, so focused subsets can reveal finer structure without cluttering the full map.The approach formalizes this balance between eliminating extraneous detail and highlighting relationships among important structures using information theory.

Supporting material

The supporting material defines the map equation as the description length of a random walk under a module partition and explains how to minimize it. It also details frequency and exit-probability calculations, optimization procedures, and map visualization.

  • Map equation: The map equation L(M) measures the average bits per step needed to describe an infinite random walk over n nodes partitioned into m modules.Each node belongs to exactly one module.
  • Map equation: The two-level code separates between-module movements from within-module movements, reusing node codewords within modules to compress regular flow patterns.The optimal partition minimizes the map equation, with modules representing regions where random walkers remain for long periods.
  • Probability calculations: The objective depends on ergodic node visit frequencies and module exit probabilities, which can be calculated or updated efficiently during optimization.The power method calculates steady-state node visit frequencies.
  • Probability calculations: For directed networks, teleportation probability τ = 0.15 makes the random walk an irreducible and aperiodic Markov chain with a unique steady-state distribution.The results are reported as robust to the choice of τ.
  • Optimization: Optimization first uses greedy merging and then heat-bath simulated annealing, which can improve the description length by up to several percent.The annealing stage starts from the greedy configuration and selects the run with the shortest map description.
  • Visualization: Visualization scales module areas by random-surfer residence time, bordering rings by exit probability, and intermodule link widths by transition probabilities excluding teleportation.These visual encodings represent the optimized map’s flow structure.

Fields of science · 1 Molecular & Cell Biology (20%)

Molecular and Cell Biology accounts for 20% of the mapped fields of science and is represented by a ranked list of at least 503 journals. The list includes prominent molecular, cellular, immunological, genetic, biochemical, and biomedical journals, extending across specialized subfields.

  • 1 Molecular & Cell Biology (20%): 20% is the reported share for Molecular and Cell Biology in the field map.
  • 1 Molecular & Cell Biology (20%): The highest-ranked entries include Journal of Biological Chemistry, Cell, Journal of Immunology, EMBO Journal, and Blood.
  • 1 Molecular & Cell Biology (20%): The list spans molecular biology, cell biology, immunology, cancer research, genetics, biochemistry, virology, and developmental biology journals.
  • 1 Molecular & Cell Biology (20%): Mid-ranked entries include cancer, mammalian genetics, microscopy, endocrinology, plant physiology, proteomics, and clinical immunology journals.
  • 1 Molecular & Cell Biology (20%): Ranks 325–346 include developmental biology, medical microbiology, mutation research, membrane biology, microbial pathogenesis, immunology, and cell biology journals.
  • 1 Molecular & Cell Biology (20%): 503 is the highest journal rank visible in the Molecular and Cell Biology list.
  • 1 Molecular & Cell Biology (20%): The lower-ranked portion includes biochemistry, hematology, toxicology, peptide science, theoretical biosciences, genetics, biotechnology, and biomedicine journals.

2 Medicine (14%) … 6 Economics (3.5%)

The paper maps journal groupings across five fields, with Medicine the largest listed section at 14% and Economics the smallest at 3.5%. The sections span leading and specialized journals in Medicine, Physics, Neuroscience, Ecology & Evolution, and Economics.

  • 2 Medicine (14%): Medicine (14%) lists major journals including New Engl J Med, Lancet, Circulation, and Jama-J Am Med Assoc.The list continues through specialty and public-health journals such as J Clin Oncol, Diabetes, Pediatrics, and Am J Public Health.
  • 2 Medicine (14%): Medicine (14%) also includes hundreds of specialized journals spanning emergency medicine, surgery, nursing, cardiology, geriatrics, and international medical research.Examples include Ann Emerg Med, Brit J Anaesth, World J Surg, J Adv Nurs, Clin Transplant, and Jpn J Infect Dis.
  • 3 Physics (10%): Physics (10%) lists prominent journals such as Phys Rev Lett, Phys Rev B, Appl Phys Lett, J Appl Phys, and J Chem Phys.The section also includes materials, chemistry, optics, plasma, polymers, and instrumentation journals.
  • 4 Neuroscience (5.8%): Neuroscience (5.8%) includes leading journals such as J Neurosci, Neuron, Neurology, Nat Neurosci, Brain, and Neuroimage.The list extends to clinical, developmental, computational, sleep, pain, and neurotoxicology journals.
  • 5 Ecology & Evolution (4.3%): Ecology & Evolution (4.3%) lists journals including Ecology, P Roy Soc B-Biol Sci, Mar Ecol-Prog Ser, Oecologia, Evolution, and Mol Ecol.Additional titles cover conservation, forestry, aquatic science, animal behavior, biodiversity, and systematics.
  • 6 Economics (3.5%): Economics (3.5%) lists major journals including Am Econ Rev, J Financ, Q J Econ, Econometrica, J Polit Econ, and J Financ Econ.The section also includes econometrics, development, labor, public, health, urban, and financial economics journals.
  • 6 Economics (3.5%): Economics (3.5%) further lists journals spanning taxation, agriculture, law, banking, growth, environmental economics, accounting, industrial organization, and energy policy.Examples include Natl Tax J, Am J Agr Econ, J Law Econ, J Bank Financ, Ecol Econ, and Energ Policy.

7 Geosciences (3.4%) … 14 Analytic Chemistry (1.4%)

The map contains eight consecutive disciplinary sections, spanning Geosciences at 3.4% to Analytic Chemistry at 1.4%. Each section is represented through ranked journal lists.

  • 7 Geosciences (3.4%): 3.4%: Geosciences is represented by ranked journals including J Geophys Res, Geophys Res Lett, Earth Planet Sc Lett, and Geology.The listed geoscience journals extend through at least 223 entries, including climate, oceanographic, geological, and planetary-science titles.
  • 8 Psychology (2.8%): 2.8%: Psychology is represented by ranked journals including J Pers Soc Psychol, Am Psychol, Psychol Bull, and Child Dev.The list also includes cognitive, developmental, social, health, and behavioral psychology journals.
  • 9 Chemistry (2.7%): 2.7%: Chemistry is represented by ranked journals including J Am Chem Soc, Angew Chem Int Edit, Chem Commun, and Chem Rev.The rankings include organic, inorganic, medicinal, analytical, physical, and materials-related chemistry titles.
  • 10 Psychiatry (2.4%): 2.4%: Psychiatry is represented by ranked journals including Am J Psychiat, Biol Psychiat, Arch Gen Psychiat, and J Consult Clin Psych.The list covers clinical psychiatry, addiction, psychopharmacology, child and adolescent psychiatry, and related behavioral-health journals.
  • 11 Environmental Chemistry & Microbiology (2.3%): 2.3%: Environmental Chemistry & Microbiology is represented by ranked journals including Appl Environ Microb, Environ Sci Technol, Water Res, and Chemosphere.The rankings include environmental toxicology, soil science, hydrology, microbiology, biotechnology, agriculture, and marine-pollution journals.
  • 12 Mathematics (2.0%): 2.0%: Mathematics is represented by ranked journals including Commun Math Phys, P Am Math Soc, J Algebra, and T Am Math Soc.The list also includes journals in analysis, geometry, algebra, differential equations, and mathematical physics.
  • 13 Computer Science (1.4%): 1.4%: Computer Science is represented by ranked journals including Lect Notes Comput Sc, Commun Acm, Lect Notes Artif Int, and Ieee T Comput.The rankings include theoretical computer science, artificial intelligence, machine learning, algorithms, software engineering, and information systems.
  • 14 Analytic Chemistry (1.4%): 1.4%: Analytic Chemistry is represented by ranked journals including Anal Chem, J Agr Food Chem, J Chromatogr A, and Anal Chim Acta.The list includes chromatography, spectroscopy, mass spectrometry, electroanalysis, chemometrics, food science, and phytochemistry journals.

15 Business & Marketing (1.2%) … 23 Gastroenterology (0.80%)

The map identifies journal-based communities spanning business, political science, physical sciences, medicine, social science, statistics, astronomy, and gastroenterology. Their reported shares range from 1.2% for Business & Marketing and Political Science to 0.80% for Gastroenterology.

  • 15 Business & Marketing (1.2%): Business & Marketing (1.2%) includes management, marketing, organizational behavior, information systems, advertising, ethics, and technology-management journals.The listed cluster includes Acad Manage J, Manage Sci, J Marketing Res, J Marketing, J Organ Behav, and related outlets through J Bu.
  • 16 Political Science (1.2%): Political Science (1.2%) is represented by journals covering political science, international relations, security, comparative politics, democracy, conflict resolution, and public administration.Leading titles include Am Polit Sci Rev, Am J Polit Sci, Int Organ, World Polit, Int Security, J Polit, and Public Admin Rev.
  • 17 Fluid Mechanics (1.1%): Fluid Mechanics (1.1%) centers on fluid dynamics, computational physics, heat transfer, numerical analysis, combustion, and related engineering applications.The cluster lists J Fluid Mech, Phys Fluids, J Comput Phys, Int J Heat Mass Tran, and Combust Flame.
  • 18 Medical Imaging (1.1%): Medical Imaging (1.1%) spans radiology, neuroradiology, nuclear medicine, magnetic resonance, radiation oncology, imaging technology, and related clinical specialties.Its journals include Radiology, Int J Radiat Oncol, Am J Roentgenol, J Neurosurg, Magnet Reson Med, and Comput Med Imag Grap.
  • 19 Material Engineering (1.1%): Material Engineering (1.1%) comprises journals on solids and structures, numerical engineering methods, mechanics, composites, cement, fracture, fatigue, and aerospace engineering.Representative titles include Int J Solids Struct, Comput Method Appl M, J Mech Phys Solids, Compos Sci Technol, and Eng Fail Anal.
  • 20 Sociology (0.97%): Sociology (0.97%) includes journals focused on sociology, marriage and family, demography, criminology, social psychology, population, migration, gender, and social research.The listed titles include Am Sociol Rev, Am J Sociol, Annu Rev Sociol, J Marriage Fam, Demography, and Criminology.
  • 23 Gastroenterology (0.80%): Gastroenterology (0.80%) is represented by journals covering gastrointestinal medicine, hepatology, endoscopy, liver disease, inflammatory bowel disease, and related digestive disorders.Leading titles include Gastroenterology, Hepatology, Am J Gastroenterol, Gut, J Hepatol, and Gastrointest Endosc.

24 Law (0.79%) … 33 Crop Science (0.47%)

The map identifies ten disciplinary journal clusters, each represented by a ranked set of core journals and accounting for 0.47%–0.79% of the network. The sections span law, engineering, education, communications, health, operations research, ophthalmology, and crop science.

  • 24 Law (0.79%): 24 Law (0.79%) is represented by ranked law journals, led by Yale Law J, Harvard Law Rev, and Stanford Law Rev.The listed set extends through specialized legal outlets including Law Philos, Law Libr J, and J Marit Law Commer.
  • 25 Chemical Engineering (0.77%): 25 Chemical Engineering (0.77%) is led by Ind Eng Chem Res, Chem Eng Sci, J Catal, and Appl Catal A-Gen.The ranked journals also include membrane science, fuel, catalysis, desalination, separation, and chemical-process publications.
  • 29 Control Theory (0.64%): 29 Control Theory (0.64%) is represented by Ieee T Automat Contr, Automatica, Ieee T Neural Networ, and Fuzzy Set Syst, alongside robotics, optimization, and systems journals.The ranked set also includes control engineering, robust nonlinear systems, mechanical design, and autonomous systems.

34 Geography (0.47%) … 43 Rheumatology (0.32%)

The map identifies ten specialized fields spanning geography, anthropology, veterinary science, imaging, agriculture, parasitology, dentistry, dermatology, urology, and rheumatology, with shares ranging from 0.47% to 0.32%. Each field is represented by a distinct set of journals centered on its disciplinary topic.

  • 34 Geography (0.47%): Geography (0.47%) is represented by journals focused on urban studies, environmental planning, regional studies, human geography, and geographic information science.The listed titles include Urban Studies, Environment and Planning, Regional Studies, Progress in Human Geography, and International Journal of Geographical Information Science.
  • 35 Anthropology (0.45%): Anthropology (0.45%) comprises journals covering physical and cultural anthropology, human evolution, archaeology, primatology, gender studies, and regional studies.The list includes American Journal of Physical Anthropology, Public Culture, Current Anthropology, American Ethnologist, Journal of Human Evolution, and Journal of Archaeological Science.
  • 36 Veterinary (0.45%): Veterinary (0.45%) is organized around veterinary medicine, microbiology, immunology, pathology, surgery, diagnostics, wildlife disease, and animal health.Representative titles include Veterinary Record, Veterinary Microbiology, Veterinary Immunology and Immunopathology, Veterinary Pathology, and Veterinary Surgery.
  • 37 Computer Imaging (0.43%): Computer Imaging (0.43%) centers on pattern analysis, image processing, pattern recognition, computer vision, graphics, visualization, and image communication.Its leading journals include IEEE Transactions on Pattern Analysis, IEEE Transactions on Image Processing, Pattern Recognition, and International Journal of Computer Vision.
  • 38 Agriculture (0.40%): Agriculture (0.40%) is represented primarily by journals on dairy science, animal science, livestock production, poultry, meat, reproduction, genetics, nutrition, and animal husbandry.The two passages list titles including Journal of Dairy Science, Journal of Animal Science, Theriogenology, Poultry Science, Meat Science, and Livestock Production Science.
  • 39 Parasitology (0.37%): Parasitology (0.37%) includes journals on tropical medicine, parasites, veterinary parasitology, medical entomology, fish diseases, protists, and parasite immunology.Leading titles include American Journal of Tropical Medicine and Hygiene, International Journal for Parasitology, Journal of Parasitology, and Veterinary Parasitology.
  • 40 Dentistry (0.37%): Dentistry (0.37%) is centered on dental research, periodontology, oral surgery, orthodontics, prosthodontics, endodontics, implantology, dental materials, and caries research.The list includes Journal of Dental Research, Journal of Periodontology, Oral Surgery Oral Medicine, Journal of Clinical Periodontology, and Dental Materials.

44 Applied Acoustics (0.30%) … 54 Tribology (0.16%)

The sections list ranked journal clusters across eleven fields, with shares ranging from 0.30% to 0.16%. Together, they span acoustics, pharmacology, pathology, humanities, engineering, information, communication, power systems, and tribology.

  • 44 Applied Acoustics (0.30%): Applied Acoustics (0.30%) centers on journals including J Acoust Soc Am, J Speech Lang Hear R, Hearing Res, and Ultrasound Med Biol.The listed cluster contains 25 ranked journals, extending from acoustic and speech research to audiology, ultrasound, and related applications.
  • 45 Pharmacology (0.30%): Pharmacology (0.30%) is led by Biomaterials, J Control Release, Int J Pharm, Pharm Res, and Adv Drug Deliver Rev.The ranking continues through drug delivery, tissue engineering, biomaterials, pharmaceutical development, and related journals.
  • 46 Pathology (0.27%): Pathology (0.27%) is represented by Am J Surg Pathol, Hum Pathol, Modern Pathol, Am J Clin Pathol, and J Clin Pathol.The ranked list also includes diagnostic, cytopathology, histopathology, molecular pathology, and surgical pathology journals.
  • 47 History & Philosophy of Science (0.19%): History & Philosophy of Science (0.19%) includes Philos Sci, Soc Stud Sci, Stud Hist Philos Sci, Am Math Mon, and Arch Hist Exact Sci.Additional journals cover the history and philosophy of science, mathematics, medicine, technology, and related disciplines.
  • 48 Otolaryngology (0.19%): Otolaryngology (0.19%) is led by Laryngoscope, Otolaryng Head Neck, Arch Otolaryngol, Ann Oto Rhinol Laryn, and Head Neck-J Sci Spec.The list spans otology, rhinology, laryngology, pediatric otorhinolaryngology, voice, dysphagia, and related clinical journals.
  • 49 Electromagnetic Engineering (0.18%): Electromagnetic Engineering (0.18%) features Ieee T Microw Theory, Ieee T Antenn Propag, Microw Opt Techn Let, Ieee Microw Wirel Co, and Ieee Antennas Propag.The ranked journals cover microwave, antenna, electromagnetic, infrared, radiofrequency, and related electrical engineering research.
  • 53 Power Systems (0.16%); 54 Tribology (0.16%): Power Systems (0.16%) and Tribology (0.16%) conclude the block with rankings led by Ieee T Power Syst and J Mater Process Tech, respectively.Power Systems includes industrial electronics, power delivery, energy conversion, and electrical engineering journals, while Tribology includes Wear, Int J Mach Tool Manu, J Manuf Sci E-T Asme, and J Tribol-T Asme.

55 History (0.15%) … 66 Nuclear Energy (0.055%)

The sections list ranked journals across twelve specialized fields, spanning history, engineering, materials, radiation, language, social services, psychoanalysis, regional studies, forensic science, transfusion, mycology, and nuclear energy. The supplied passages provide journal rankings for eleven of these fields, while no passage is provided for Mycology.

  • 55 History (0.15%): History is represented by 23 ranked journals, led by J Econ Hist, Am Hist Rev, and J Am Hist.The list includes economic, American, Slavic, environmental, urban, family, labor, social, and interdisciplinary history journals.
  • 56 Geotechnology (0.14%); 57 Wood Products (0.12%): Geotechnology and Wood Products are represented by ranked journal lists led by J Geotech Geoenviron and Holzforschung, respectively.The geotechnology list contains 16 journals, while the Wood Products list contains 18.
  • 58 Radiation (0.10%); 59 Linguistics (0.093%): Radiation and Linguistics feature ranked journal lists led by Radiat Res and J Pragmatics, respectively.The Radiation list contains 13 journals, and the Linguistics list contains 13.
  • 60 Social Work (0.079%); 61 Psychoanalysis (0.077%): Social Work and Psychoanalysis are represented by 17 and 9 ranked journals, led by Soc Work and J Am Psychoanal Ass.Their lists include journals focused on social services, family and youth services, clinical practice, and psychoanalytic theory and practice.
  • 62 Middle Eastern Studies (0.073%): Middle Eastern Studies is represented by 7 ranked journals, led by Int J Middle E Stud, New Left Rev, and Middle Eastern Stud.The list also includes Middle East J, Mon Rev, Sci Soc, and Race Class.
  • 63 Forensic Science (0.067%); 64 Transfusion (0.066%): Forensic Science and Transfusion each have specialized ranked journal lists, led by Forensic Sci Int and Transfusion, respectively.The lists contain 8 forensic-science journals and 11 transfusion or systems-oriented journals.
  • 66 Nuclear Energy (0.055%): Nuclear Energy is represented by 8 ranked journals, led by Nucl Eng Des, Ann Nucl Energy, and Nucl Technol.The remaining entries include journals covering nuclear science, nuclear engineering, atomic energy, and nuclear power.

67 offshore Engineering (0.036%) … 1 Ann Tourism Res, 2 Tourism Manage

The listed sections identify representative journals across offshore engineering, environmental ethics, entomology, higher education, other topics, civil engineering, and laboratory veterinary science. Their displayed shares range from 0.017% to 0.036%.

  • 67 offshore Engineering (0.036%): Offshore Engineering (0.036%) is represented by Coast Eng, Ocean Eng, J Waterw Port C-Asce, and related journals.
  • 68 Environmental Ethics (0.034%): Environmental Ethics (0.034%) includes Ethics, Soc Philos Policy, Environ Ethics, Environ Value, and J Agr Environ Ethic.
  • 69 Entomology (0.033%): Entomology (0.033%) includes P Entomol Soc Wash, Entomol News, T Am Entomol Soc, and related journals.
  • 70 Higher Education (0.028%): Higher Education (0.028%) includes J Coll Student Dev, Res High Educ, J High Educ, and Rev High Educ.
  • 73 Other (0.023%): Other (0.023%) includes J Leisure Res, Leisure Sci, J Am Leather Chem As, J Soc Leath Tech Ch, and J Sci Ind Res India.
  • 74 Civil Engineering (0.022%): Civil Engineering (0.022%) includes J Comput Civil Eng, J Constr Eng M Asce, Build Res Inf, J Surv Eng-Asce, and J Prof Iss Eng Ed.
  • 75 Lab Veterinary (0.017%): Lab Veterinary (0.017%) includes Lab Anim-Uk, Comparative Med, Contemp Top Lab Anim, Lab Animal, and Scand J Lab Anim Sci.

78 Textiles (0.015%) … Fields of social science

The excerpt lists representative journals for textiles and medical informatics, covering textile research, computational biology, medicine, and measurement control.

  • 78 Textiles (0.015%): Textiles is represented by Text Res J, Sen-I Gakkaishi, Indian J Fibre Text, and Tekstil.The textiles subsection is labeled 78 Textiles (0.015%).
  • 81 Medical Informatics (0.011%): Medical informatics is represented by Comput Meth Prog Bio, Comput Biol Med, and Meas Control-Uk.The medical informatics subsection is labeled 81 Medical Informatics (0.011%).

1 Economics (19%) … 9 Education (2.7%)

The map organizes journals into nine disciplinary sections, from Economics (19%) and Psychology (18%) to Education (2.7%). Each section lists representative journals in rank order, illustrating the field-specific composition of the mapped scientific communication network.

  • 1 Economics (19%): Economics (19%) includes leading journals such as Am Econ Rev, Q J Econ, J Financ, Econometrica, and J Polit Econ.The list continues through 91 ranked economics journals, including J Health Econ, J Labor Econ, and Energy J.
  • 4 Healthcare (7.2%): Healthcare (7.2%) features journals focused on public health, medicine, health services, aging, nursing, and health education.Representative titles include Am J Public Health, Soc Sci Med, Health Affair, Med Care, and J Adv Nurs.
  • 5 Political Science (4.9%): Political Science (4.9%) is represented by journals covering comparative politics, international relations, security, conflict, democracy, and public opinion.The ranked list begins with Am Polit Sci Rev, Am J Polit Sci, Int Organ, World Polit, and J Polit.
  • 6 Sociology (Behavioral) (4.4%): Sociology (Behavioral) (4.4%) includes journals addressing social structure, families, demography, criminology, migration, gender, work, and sociological methods.Leading examples are Am Sociol Rev, Am J Sociol, J Marriage Fam, Annu Rev Sociol, and Soc Forces.
  • 7 Management (4.1%): Management (4.1%) is represented by journals in applied psychology, organizational studies, strategy, management science, human resources, and innovation.The list starts with J Appl Psychol, Acad Manage J, Acad Manage Rev, Strategic Manage J, and Manage Sci.
  • 8 Law (3.9%): Law (3.9%) comprises ranked law reviews and legal journals spanning constitutional, international, corporate, criminal, environmental, and comparative law.The leading titles include Yale Law J, Harvard Law Rev, Stanford Law Rev, Columbia Law Rev, and Va Law Rev.
  • 9 Education (2.7%): Education (2.7%) includes journals focused on educational psychology, research, pedagogy, literacy, science education, learning, and teacher education.Representative journals include J Educ Psychol, Am Educ Res J, Educ Psychol, Phi Delta Kappan, and Educ Leadership.

10 Geography (2.5%) … 20 Human-Computer Interface (0.54%)

The paper maps eleven smaller disciplinary sections, led by Geography at 2.5% and extending to Human-Computer Interface at 0.54%. Each section is represented by a ranked list of journals, showing the publication venues associated with these fields.

  • 10 Geography (2.5%): Geography accounts for 2.5% and includes leading journals such as Urban Stud, Environ Plann A, and Prog Hum Geog, with additional venues including Cartogr J and J Urban Technol.The listed journals span urban studies, environmental planning, regional studies, geography, cartography, and urban technology.
  • 11 Physical Anthropology (1.5%): Physical Anthropology accounts for 1.5% and is led by Am J Phys Anthropol, J Hum Evol, Curr Anthropol, and J Archaeol Sci.The ranked list also includes journals focused on human biology, archaeology, osteoarchaeology, and anthropology.
  • 12 Cultural Anthropology (1.2%): Cultural Anthropology accounts for 1.2%, with Public Culture, Am Ethnol, Cult Anthropol, and Signs among its highest-ranked journals.The list also covers regional studies, gender studies, development, African and Asian studies, and cultural studies.
  • 13 Marketing (1.0%): Marketing accounts for 1.0% and centers on J Marketing Res, J Marketing, Market Sci, J Consum Res, and J Acad Market Sci.Other listed venues address business research, retailing, advertising, consumer affairs, services, and decision science.
  • 14 Information Science (0.99%): Information Science accounts for 0.99%, led by J Am Soc Inf Sci Tec, Scientometrics, Coll Res Libr, J Doc, and Inform Process Manag.The ranked journals include library science, information processing, documentation, knowledge organization, and electronic libraries.
  • 17 Communication (0.80%); 18 Educational Assessment (0.70%): Communication accounts for 0.80% and Educational Assessment for 0.70%, represented respectively by communication journals and measurement-focused journals.Communication is led by J Commun and Journalism Mass Comm; Educational Assessment is led by Psychol Methods and Psychometrika.
  • 19 Educational Psychology (0.66%); 20 Human-Computer Interface (0.54%): Educational Psychology accounts for 0.66%, and Human-Computer Interface accounts for 0.54%, with ranked journals focused on school psychology and information systems or human-computer interaction.Educational Psychology begins with J School Psychol and School Psychol Rev, while Human-Computer Interface begins with Mis Quart and Inform Syst Res.

21 Applied Linguistics (0.51%) … 32 Ergonomics (0.34%)

The map lists leading journals across twelve fields spanning 0.51% to 0.34% of the network. Applied Linguistics is largest, while Ergonomics is smallest, with each field represented by a distinct journal cluster.

  • 21 Applied Linguistics (0.51%): Applied Linguistics accounts for 0.51% and is led by J Pragmatics, Discourse Soc, Lang Soc, and Res Lang Soc Interac.The listed ranking contains 15 journals, ending with Foreign Lang Ann.
  • 22 Experimental Psychology (0.49%): Experimental Psychology accounts for 0.49% and is led by J Exp Anal Behav, J Exp Psychol Anim B, Physiol Behav, and Behav Process.The ranking includes 12 journals, ending with Jpn Psychol Res.
  • 25 Speech And Hearing (0.40%): Speech And Hearing accounts for 0.40% and is led by J Speech Lang Hear R, Appl Psycholinguist, Int J Lang Comm Dis, and J Phonetics.The list contains 11 journals, ending with Folia Phoniatr Logo.
  • 26 Disabilities (0.39%): Disabilities accounts for 0.39% and is led by Am J Ment Retard, J Intell Disabil Res, J Appl Behav Anal, and Behav Modif.The ranking contains 10 journals, ending with Res Pract Pers Sev D.
  • 27 Transportation (0.39%); 28 Psychoanalysis (0.38%): Transportation accounts for 0.39% and is led by Transport Res A-Pol, J Oper Res Soc, Transport Res B-Meth, and Interfaces, while Psychoanalysis accounts for 0.38%.Psychoanalysis is led by J Am Psychoanal Ass, Int J Psychoanal, Psychoanal Quart, and Psychoanal Inq, with nine journals listed.

33 Medical Ethics (0.33%) … 43 Sexuality (0.16%)

The paper maps eleven small disciplinary sections, spanning medical ethics, public administration, ethics, economic history, sport psychology, public affairs, social policy, family relations, law and behavior, criminology, and sexuality. Their reported shares range from 0.33% for Medical Ethics to 0.16% for Criminology and Sexuality.

  • 33 Medical Ethics (0.33%): Medical Ethics accounts for 0.33% and lists Hastings Cent Rep, J Med Ethics, and J Law Med Ethics among its leading journals.The passage lists eleven journals in the subsection.
  • 36 Economic History (0.26%): Economic History accounts for 0.26% and is led by J Econ Hist, Econ Hist Rev, and Explor Econ Hist.The list also includes Business History, social-science history, interdisciplinary history, and agricultural history journals.
  • 37 Sport Psychology (0.25%): Sport Psychology accounts for 0.25% and lists Res Q Exercise Sport, J Sport Exercise Psy, and Quest among its leading journals.The passage lists nine journals, including applied sport psychology, physical education, sport psychology, sociology of sport, and sport history titles.
  • 38 Public Affairs (0.22%); 39 Social Policy (0.19%): Public Affairs accounts for 0.22%, while Social Policy accounts for 0.19%, with each subsection listing journals focused on its respective field.Public Affairs begins with Public Admin and Parliament Aff; Social Policy begins with Soc Policy Admin and Policy Polit.
  • 40 Family Relations (0.18%): Family Relations accounts for 0.18%, listing Fam Relat, Fam Process, and J Marital Fam Ther among six leading journals.The remaining listed journals are American, family, and contemporary family therapy titles.
  • 43 Sexuality (0.16%): Sexuality accounts for 0.16% and lists Arch Sex Behav, J Sex Res, J Sex Marital Ther, and J Homosexual.This is the shortest journal list among the subsections in the supplied block.

44 Higher Education (0.14%) … 1 Int J Clin Exp Hyp, 2 Am J Clin Hypn

The section lists leading journals across 15 specialized fields, spanning higher education, leisure, neurorehabilitation, Pacific studies, tourism, creativity, death and dying, regional sociology, maritime law, and hypnosis.

  • 44 Higher Education (0.14%): Higher Education (0.14%) is led by J Coll Student Dev, Res High Educ, J High Educ, and Rev High Educ.These are ranked first through fourth, respectively.
  • 45 Leisure Studies (0.14%): Leisure Studies (0.14%) is represented by Environ Behav, J Environ Psychol, J Leisure Res, and Leisure Sci.
  • 46 Neurorehabilitation (0.14%): Neurorehabilitation (0.14%) is led by J Head Trauma Rehab, Rehabil Psychol, Neurorehabilitation, Rehabil Couns Bull, J Rehabil, and Int J Rehabil Res.
  • 47 Pacific Studies (0.10%): Pacific Studies (0.10%) lists Contemp Pacific, Oceania, J Polynesian Soc, and J Mat Cult.
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