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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Neuroscience 75 2007 1834 960 859 236 21471

James P. O'Callaghan publications per year

The chart shows the history of publications by James P. O'Callaghan between 1975 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. James P. O'Callaghan published across 51 years, from 1975 to 2025, averaging 4.9 papers a year. Output peaked at 12 publications in 2002. 10 of the 252 publications appeared in the last two years.

No. of publications
5 10
Bar chart. Horizontal axis: year, 1975 to 2025. Vertical axis: number of publications, 0 to 12. Peak 12 publications in 2002. 1975: 1 publication 1976: 0 publications 1977: 0 publications 1978: 0 publications 1979: 2 publications 1980: 5 publications 1981: 0 publications 1982: 1 publication 1983: 4 publications 1984: 3 publications 1985: 2 publications 1986: 1 publication 1987: 4 publications 1988: 5 publications 1989: 3 publications 1990: 3 publications 1991: 10 publications 1992: 3 publications 1993: 5 publications 1994: 8 publications 1995: 5 publications 1996: 4 publications 1997: 3 publications 1998: 7 publications 1999: 3 publications 2000: 11 publications 2001: 6 publications 2002: 12 publications 2003: 6 publications 2004: 6 publications 2005: 9 publications 2006: 8 publications 2007: 7 publications 2008: 10 publications 2009: 3 publications 2010: 8 publications 2011: 4 publications 2012: 4 publications 2013: 3 publications 2014: 9 publications 2015: 7 publications 2016: 4 publications 2017: 5 publications 2018: 10 publications 2019: 6 publications 2020: 9 publications 2021: 7 publications 2022: 3 publications 2023: 3 publications 2024: 3 publications 2025: 7 publications
1975 2025

252 publications in total across all disciplines

View publications per year as a table
James P. O'Callaghan: publications per year, 1975 to 2025
Year Publications
1975 1
1976 0
1977 0
1978 0
1979 2
1980 5
1981 0
1982 1
1983 4
1984 3
1985 2
1986 1
1987 4
1988 5
1989 3
1990 3
1991 10
1992 3
1993 5
1994 8
1995 5
1996 4
1997 3
1998 7
1999 3
2000 11
2001 6
2002 12
2003 6
2004 6
2005 9
2006 8
2007 7
2008 10
2009 3
2010 8
2011 4
2012 4
2013 3
2014 9
2015 7
2016 4
2017 5
2018 10
2019 6
2020 9
2021 7
2022 3
2023 3
2024 3
2025 7
Total 252
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James P. O'Callaghan publication distribution in Neuroscience in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Neuroscience in 2026. The highlighted bar marks where James P. O'Callaghan sits on this spectrum.

No. of scientists
100 200 300 400 500
Bar chart with 86 bars. Horizontal axis: publications, 38–47 to 887+. Vertical axis: number of scientists, 0 to 539. Most scientists, 539, have 98–107 publications. The last bar groups every scientist with 887 publications or more. The highlighted bar, 228–237 publications, is where this scientist sits. 38–47 publications: 18 scientists 48–57 publications: 79 scientists 58–67 publications: 193 scientists 68–77 publications: 323 scientists 78–87 publications: 406 scientists 88–97 publications: 452 scientists 98–107 publications: 539 scientists 108–117 publications: 505 scientists 118–127 publications: 522 scientists 128–137 publications: 469 scientists 138–147 publications: 456 scientists 148–157 publications: 459 scientists 158–167 publications: 397 scientists 168–177 publications: 383 scientists 178–187 publications: 350 scientists 188–197 publications: 302 scientists 198–207 publications: 306 scientists 208–217 publications: 262 scientists 218–227 publications: 242 scientists 228–237 publications: 220 scientists 238–247 publications: 203 scientists 248–257 publications: 174 scientists 258–267 publications: 176 scientists 268–277 publications: 175 scientists 278–287 publications: 125 scientists 288–297 publications: 116 scientists 298–307 publications: 127 scientists 308–317 publications: 128 scientists 318–327 publications: 99 scientists 328–337 publications: 89 scientists 338–347 publications: 78 scientists 348–357 publications: 96 scientists 358–367 publications: 66 scientists 368–377 publications: 59 scientists 378–387 publications: 65 scientists 388–397 publications: 54 scientists 398–407 publications: 48 scientists 408–417 publications: 49 scientists 418–427 publications: 34 scientists 428–437 publications: 31 scientists 438–447 publications: 30 scientists 448–457 publications: 31 scientists 458–467 publications: 36 scientists 468–477 publications: 40 scientists 478–487 publications: 35 scientists 488–497 publications: 30 scientists 498–507 publications: 23 scientists 508–517 publications: 26 scientists 518–527 publications: 20 scientists 528–537 publications: 23 scientists 538–547 publications: 20 scientists 548–557 publications: 20 scientists 558–567 publications: 17 scientists 568–577 publications: 14 scientists 578–587 publications: 20 scientists 588–597 publications: 20 scientists 598–607 publications: 19 scientists 608–617 publications: 18 scientists 618–627 publications: 17 scientists 628–637 publications: 11 scientists 638–647 publications: 11 scientists 648–657 publications: 11 scientists 658–667 publications: 8 scientists 668–677 publications: 7 scientists 678–687 publications: 11 scientists 688–697 publications: 10 scientists 698–707 publications: 4 scientists 708–717 publications: 6 scientists 718–727 publications: 5 scientists 728–737 publications: 5 scientists 738–747 publications: 9 scientists 748–757 publications: 9 scientists 758–767 publications: 3 scientists 768–777 publications: 7 scientists 778–787 publications: 7 scientists 788–797 publications: 6 scientists 798–807 publications: 2 scientists 808–817 publications: 2 scientists 818–827 publications: 7 scientists 828–837 publications: 0 scientists 838–847 publications: 9 scientists 848–857 publications: 3 scientists 858–867 publications: 1 scientist 868–877 publications: 3 scientists 878–886 publications: 6 scientists 887+ publications: 100 scientists
38–47 publications 887+

This scientist: 236 publications — 71st percentile

71% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 887 publications or more.

View publications distribution as a table
Number of Neuroscience scientists by publication count, Research.com 2026 ranking edition. Based on 9,597 ranked scientists.
Publications Scientists This scientist
38–47 18
48–57 79
58–67 193
68–77 323
78–87 406
88–97 452
98–107 539
108–117 505
118–127 522
128–137 469
138–147 456
148–157 459
158–167 397
168–177 383
178–187 350
188–197 302
198–207 306
208–217 262
218–227 242
228–237 220 236
238–247 203
248–257 174
258–267 176
268–277 175
278–287 125
288–297 116
298–307 127
308–317 128
318–327 99
328–337 89
338–347 78
348–357 96
358–367 66
368–377 59
378–387 65
388–397 54
398–407 48
408–417 49
418–427 34
428–437 31
438–447 30
448–457 31
458–467 36
468–477 40
478–487 35
488–497 30
498–507 23
508–517 26
518–527 20
528–537 23
538–547 20
548–557 20
558–567 17
568–577 14
578–587 20
588–597 20
598–607 19
608–617 18
618–627 17
628–637 11
638–647 11
648–657 11
658–667 8
668–677 7
678–687 11
688–697 10
698–707 4
708–717 6
718–727 5
728–737 5
738–747 9
748–757 9
758–767 3
768–777 7
778–787 7
788–797 6
798–807 2
808–817 2
818–827 7
828–837 0
838–847 9
848–857 3
858–867 1
868–877 3
878–886 6
887+ 100
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James P. O'Callaghan D-index placement in Neuroscience in 2026

The chart shows the D-index (discipline H-index) distribution of Neuroscience scientists ranked by Research.com in 2026. The highlighted bar marks where James P. O'Callaghan sits on this spectrum.

No. of scientists
100 200 300 400 500
Bar chart with 68 bars. Horizontal axis: D-Index, 30–31 to 163+. Vertical axis: number of scientists, 0 to 512. Most scientists, 512, have 46–47 D-Index. The last bar groups every scientist with 163 D-Index or more. The highlighted bar, 74–75 D-Index, is where this scientist sits. 30–31 D-Index: 42 scientists 32–33 D-Index: 172 scientists 34–35 D-Index: 296 scientists 36–37 D-Index: 435 scientists 38–39 D-Index: 459 scientists 40–41 D-Index: 456 scientists 42–43 D-Index: 467 scientists 44–45 D-Index: 478 scientists 46–47 D-Index: 512 scientists 48–49 D-Index: 435 scientists 50–51 D-Index: 425 scientists 52–53 D-Index: 418 scientists 54–55 D-Index: 392 scientists 56–57 D-Index: 357 scientists 58–59 D-Index: 334 scientists 60–61 D-Index: 328 scientists 62–63 D-Index: 260 scientists 64–65 D-Index: 278 scientists 66–67 D-Index: 239 scientists 68–69 D-Index: 250 scientists 70–71 D-Index: 210 scientists 72–73 D-Index: 200 scientists 74–75 D-Index: 189 scientists 76–77 D-Index: 170 scientists 78–79 D-Index: 146 scientists 80–81 D-Index: 113 scientists 82–83 D-Index: 126 scientists 84–85 D-Index: 100 scientists 86–87 D-Index: 84 scientists 88–89 D-Index: 99 scientists 90–91 D-Index: 84 scientists 92–93 D-Index: 85 scientists 94–95 D-Index: 72 scientists 96–97 D-Index: 76 scientists 98–99 D-Index: 45 scientists 100–101 D-Index: 49 scientists 102–103 D-Index: 43 scientists 104–105 D-Index: 32 scientists 106–107 D-Index: 45 scientists 108–109 D-Index: 50 scientists 110–111 D-Index: 32 scientists 112–113 D-Index: 39 scientists 114–115 D-Index: 32 scientists 116–117 D-Index: 29 scientists 118–119 D-Index: 27 scientists 120–121 D-Index: 19 scientists 122–123 D-Index: 23 scientists 124–125 D-Index: 27 scientists 126–127 D-Index: 16 scientists 128–129 D-Index: 24 scientists 130–131 D-Index: 13 scientists 132–133 D-Index: 21 scientists 134–135 D-Index: 17 scientists 136–137 D-Index: 14 scientists 138–139 D-Index: 15 scientists 140–141 D-Index: 10 scientists 142–143 D-Index: 10 scientists 144–145 D-Index: 13 scientists 146–147 D-Index: 9 scientists 148–149 D-Index: 8 scientists 150–151 D-Index: 6 scientists 152–153 D-Index: 6 scientists 154–155 D-Index: 7 scientists 156–157 D-Index: 7 scientists 158–159 D-Index: 10 scientists 160–161 D-Index: 4 scientists 162 D-Index: 8 scientists 163+ D-Index: 100 scientists
30–31 D-Index 163+

This scientist: 75 D-Index — 80th percentile

80% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 163 D-Index or more.

View D-Index distribution as a table
Number of Neuroscience scientists by D-index, Research.com 2026 ranking edition. Based on 9,597 ranked scientists.
D-Index Scientists This scientist
30–31 42
32–33 172
34–35 296
36–37 435
38–39 459
40–41 456
42–43 467
44–45 478
46–47 512
48–49 435
50–51 425
52–53 418
54–55 392
56–57 357
58–59 334
60–61 328
62–63 260
64–65 278
66–67 239
68–69 250
70–71 210
72–73 200
74–75 189 75
76–77 170
78–79 146
80–81 113
82–83 126
84–85 100
86–87 84
88–89 99
90–91 84
92–93 85
94–95 72
96–97 76
98–99 45
100–101 49
102–103 43
104–105 32
106–107 45
108–109 50
110–111 32
112–113 39
114–115 32
116–117 29
118–119 27
120–121 19
122–123 23
124–125 27
126–127 16
128–129 24
130–131 13
132–133 21
134–135 17
136–137 14
138–139 15
140–141 10
142–143 10
144–145 13
146–147 9
148–149 8
150–151 6
152–153 6
154–155 7
156–157 7
158–159 10
160–161 4
162 8
163+ 100
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Overview

James P. O'Callaghan is affiliated with the National Institute for Occupational Safety and Health in the United States. Their research contributions span across the field of Medicine, with a focus on several subfields including Psychiatry and Mental Health, Neurology, Physiology, Molecular Biology, and Genetics.

O'Callaghan has published extensively on topics related to Fibromyalgia and Chronic Fatigue Syndrome Research, Spaceflight Effects on Biology, Neuroinflammation and Neurodegeneration Mechanisms, Long-Term Effects of COVID-19, Stress Responses and Cortisol, Tryptophan and Brain Disorders, and Pain Mechanisms and Treatments.

Frequent coauthors in their work include Lindsay T. Michalovicz, Kimberly A. Kelly, Byron C. Jones, Lu Lu, and Kimberly Sullivan.

Publication venues where O'Callaghan has made repeated contributions include:

  • Brain Behavior and Immunity
  • International Journal of Molecular Sciences
  • Brain Sciences
  • Life Sciences
  • Frontiers in Toxicology

Some of the recent papers associated with O'Callaghan's research interests are:

  • Reactive astrocyte nomenclature, definitions, and future directions, 2021, Nature Neuroscience
  • Colonic microbiota is associated with inflammation and host epigenomic alterations in inflammatory bowel disease, 2020, Nature Communications
  • Acetylcholinesterase inhibitor exposures as an initiating factor in the development of Gulf War Illness, a chronic neuroimmune disorder in deployed veterans, 2020, Neuropharmacology
  • Microglial activation and responses to vasculature that result from an acute LPS exposure, 2020, NeuroToxicology
  • Alterations in high-order diffusion imaging in veterans with Gulf War Illness is associated with chemical weapons exposure and mild traumatic brain injury, 2020, Brain Behavior and Immunity

Best Publications

  • Reactive astrocyte nomenclature, definitions, and future directions

    Carole Escartin;Elena Galea;András Lakatos;James P. O’Callaghan

  • Neuroendocrine aspects of the response to stress

    Diane B. Miller;James P. O'Callaghan

  • DARPP-32: Regulator of the Efficacy of Dopaminergic Neurotransmission

    A. A. Fienberg;N. Hiroi;Paul G Mermelstein;W. J. Song

  • Neurotoxicity profiles of substituted amphetamines in the C57BL/6J mouse.

    J P O'Callaghan;D B Miller

  • Biomarkers of Parkinson's disease: present and future.

    Diane B. Miller;James P. O’Callaghan

  • Mice deficient in TNF receptors are protected against dopaminergic neurotoxicity: implications for Parkinson’s disease

    Krishnan Sriram;Joanna M. Matheson;Stanley A. Benkovic;Diane B. Miller

  • Induction of gp130-related Cytokines and Activation of JAK2/STAT3 Pathway in Astrocytes Precedes Up-regulation of Glial Fibrillary Acidic Protein in the 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine Model of Neurodegeneration KEY SIGNALING PATHWAY FOR ASTROGLIOSIS IN VIVO?

    Krishnan Sriram;Stanley A. Benkovic;Meleik A. Hebert;Diane B. Miller

  • Quantification of the analgesic activity of narcotic antagonists by a modified hot-plate procedure.

    J P O'Callaghan;S G Holtzman

  • Astrogliosis in CNS pathologies: is there a role for microglia?

    Dan Zhang;Xiaoming Hu;Xiaoming Hu;Li Qian;Li Qian;James P. O’Callaghan

  • The Impact of Gender and Estrogen on Striatal Dopaminergic Neurotoxicity.

    Diane B. Miller;Syed F. Ali;James P. O'callaghan;Susan C. Laws

  • Distinct roles of PDE4 and PDE10A in the regulation of cAMP/PKA signaling in the striatum

    Akinori Nishi;Mahomi Kuroiwa;Diane B. Miller;James P. O'Callaghan

  • Environment-, drug- and stress-induced alterations in body temperature affect the neurotoxicity of substituted amphetamines in the C57BL/6J mouse.

    D B Miller;J P O'Callaghan

  • Glial fibrillary acidic protein and related glial proteins as biomarkers of neurotoxicity

    James P O’Callaghan;Krishnan Sriram

  • Divergent roles for tumor necrosis factor-alpha in the brain.

    Krishnan Sriram;James P. O’Callaghan

  • Time course of the development of Alzheimer-like pathology in the doubly transgenic PS1+APP mouse.

    Marcia N. Gordon;Leigh A. Holcomb;Paul T. Jantzen;Giovanni DiCarlo

  • Trimethyltin-induced neuronal damage in the rat brain: comparative studies using silver degeneration stains, immunocytochemistry and immunoassay for neuronotypic and gliotypic proteins.

    C D Balaban;J P O'Callaghan;M L Billingsley

  • Deficiency of TNF receptors suppresses microglial activation and alters the susceptibility of brain regions to MPTP-induced neurotoxicity: role of TNF-alpha.

    Krishnan Sriram;Joanna M. Matheson;Stanley A. Benkovic;Diane B. Miller

  • Minocycline attenuates microglial activation but fails to mitigate striatal dopaminergic neurotoxicity: role of tumor necrosis factor-alpha.

    Krishnan Sriram;Diane B. Miller;James P. O'Callaghan

  • Effects of 3,4-methylenedioxymethamphetamine on autonomic thermoregulatory responses of the rat.

    Christopher J. Gordon;William P. Watkinson;James P. O'Callaghan;Diane B. Miller

  • Brain injury in a dish : A model for reactive gliosis

    Michael K. McMillian;Linda Thai;J-S. Hong;James P. O'Callaghan

  • Aging, stress and the hippocampus.

    D.B. Miller;J.P. O’Callaghan

  • Functional profile of a novel modulator of serotonin, dopamine, and glutamate neurotransmission.

    Gretchen L. Snyder;Kimberly E. Vanover;Hongwen Zhu;Diane B. Miller

Frequent Co-Authors

Nancy G. Klimas
Nancy G. Klimas Nova Southeastern University
Robert W. Williams
Robert W. Williams University of Tennessee Health Science Center
Lu Lu
Lu Lu University of Tennessee Health Science Center
Akinori Nishi
Akinori Nishi Kurume University
Timothy Heeren
Timothy Heeren Boston University
Paul Greengard
Paul Greengard Rockefeller University
Giorgio Carmignoto
Giorgio Carmignoto National Research Council (CNR)
Xiaoming Hu
Xiaoming Hu University of Pittsburgh
Pierre J. Magistretti
Pierre J. Magistretti École Polytechnique Fédérale de Lausanne

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