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Koichi Iwata

Koichi Iwata

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Neuroscience 49 5989 5513 191 180 276 8694

Koichi Iwata publications per year

The chart shows the history of publications by Koichi Iwata between 1984 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Koichi Iwata published across 42 years, from 1984 to 2025, averaging 7 papers a year. Output peaked at 16 publications in 2011. 6 of the 295 publications appeared in the last two years.

No. of publications
5 10 15
Bar chart. Horizontal axis: year, 1984 to 2025. Vertical axis: number of publications, 0 to 16. Peak 16 publications in 2011. 1984: 2 publications 1985: 5 publications 1986: 4 publications 1987: 5 publications 1988: 3 publications 1989: 1 publication 1990: 4 publications 1991: 5 publications 1992: 4 publications 1993: 4 publications 1994: 4 publications 1995: 2 publications 1996: 4 publications 1997: 2 publications 1998: 9 publications 1999: 1 publication 2000: 3 publications 2001: 5 publications 2002: 6 publications 2003: 3 publications 2004: 7 publications 2005: 6 publications 2006: 7 publications 2007: 10 publications 2008: 14 publications 2009: 10 publications 2010: 15 publications 2011: 16 publications 2012: 13 publications 2013: 10 publications 2014: 4 publications 2015: 12 publications 2016: 8 publications 2017: 16 publications 2018: 9 publications 2019: 11 publications 2020: 12 publications 2021: 9 publications 2022: 14 publications 2023: 10 publications 2024: 2 publications 2025: 4 publications
1984 2025

295 publications in total across all disciplines

View publications per year as a table
Koichi Iwata: publications per year, 1984 to 2025
Year Publications
1984 2
1985 5
1986 4
1987 5
1988 3
1989 1
1990 4
1991 5
1992 4
1993 4
1994 4
1995 2
1996 4
1997 2
1998 9
1999 1
2000 3
2001 5
2002 6
2003 3
2004 7
2005 6
2006 7
2007 10
2008 14
2009 10
2010 15
2011 16
2012 13
2013 10
2014 4
2015 12
2016 8
2017 16
2018 9
2019 11
2020 12
2021 9
2022 14
2023 10
2024 2
2025 4
Total 295
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Koichi Iwata 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 Koichi Iwata 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, 268–277 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: 276 publications — 79th percentile

79% 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
238–247 203
248–257 174
258–267 176
268–277 175 276
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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Koichi Iwata 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 Koichi Iwata 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, 48–49 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: 49 D-Index — 39th percentile

39% 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 49
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
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

Koichi Iwata is affiliated with Nihon University in Japan and has contributed extensively to the fields of Medicine and Neuroscience. Their body of work spans 71 publications in Medicine and 37 in Neuroscience, with significant focus on physiology and cellular and molecular neuroscience. Subfields include Physiology, Cellular and Molecular Neuroscience, Neurology, Sensory Systems, and Endocrine and Autonomic Systems.

The scientist's research emphasizes diverse topics related mainly to pain mechanisms and neurological functions. Major themes include:

  • Pain Mechanisms and Treatments
  • Neuropeptides and Animal Physiology
  • Neuroscience of Respiration and Sleep
  • Botulinum Toxin and Related Neurological Disorders
  • Nerve Injury and Regeneration
  • Trigeminal Neuralgia and Treatments
  • Pediatric Pain Management Techniques

Koichi Iwata's publication record features work in a range of journals, with frequent publications in:

  • International Journal of Molecular Sciences
  • Journal of Oral Science
  • Neuroscience Research
  • Journal of Oral Biosciences
  • Neuroscience

Recent papers include:

  • Microglia-Astrocyte Communication via C1q Contributes to Orofacial Neuropathic Pain Associated with Infraorbital Nerve Injury, 2020, International Journal of Molecular Sciences
  • M2 macrophage-derived cathepsin S promotes peripheral nerve regeneration via fibroblast-Schwann cell-signaling relay, 2023, Journal of Neuroinflammation
  • Orofacial Neuropathic Pain-Basic Research and Their Clinical Relevancies, 2021, Frontiers in Molecular Neuroscience
  • P2X3 receptor upregulation in trigeminal ganglion neurons through TNFα production in macrophages contributes to trigeminal neuropathic pain in rats, 2021, The Journal of Headache and Pain
  • Pathophysiological mechanisms of persistent orofacial pain, 2020, Journal of Oral Science

The scientist collaborates regularly with several researchers, including:

  • Masamichi Shinoda
  • Yoshinori Hayashi
  • Suzuro Hitomi
  • Ikuko Shibuta
  • Kumi Soma

Best Publications

  • Phosphorylation of Extracellular Signal-Regulated Kinase in Primary Afferent Neurons by Noxious Stimuli and Its Involvement in Peripheral Sensitization

    Yi Dai;Koichi Iwata;Tetsuo Fukuoka;Eiji Kondo

  • Response Properties and Organization of Nociceptive Neurons in Area 1 of Monkey Primary Somatosensory Cortex

    Dan R. Kenshalo;Koichi Iwata;Maurice Sholas;David A. Thomas

  • Osteoclasts play a part in pain due to the inflammation adjacent to bone.

    Maho Nagae;Toru Hiraga;Hiroki Wakabayashi;Liyang Wang

  • Astroglia in medullary dorsal horn (trigeminal spinal subnucleus caudalis) are involved in trigeminal neuropathic pain mechanisms.

    Akiko Okada-Ogawa;Ikuko Suzuki;Barry J. Sessle;Chen-Yu Chiang

  • Medullary Dorsal Horn Neuronal Activity in Rats with Persistent Temporomandibular Joint and Perioral Inflammation

    Koichi Iwata;Akimasa Tashiro;Yoshiyuki Tsuboi;Takao Imai

  • Potassium channels as a potential therapeutic target for trigeminal neuropathic and inflammatory pain

    Mamoru Takeda;Yoshiyuki Tsuboi;Junichi Kitagawa;Kazuharu Nakagawa

  • Role of Glia in Orofacial Pain

    Chen-Yu Chiang;Jonathan O. Dostrovsky;Koichi Iwata;Barry J. Sessle

  • Morphological and electrophysiological properties of ACCx nociceptive neurons in rats.

    H. Yamamura;K. Iwata;Y. Tsuboi;K. Toda

  • Orofacial deep and cutaneous tissue inflammation and trigeminal neuronal activation. Implications for persistent temporomandibular pain.

    Hiroki Imbe;Koichi Iwata;Qi Qi Zhou;Shiping Zou

  • Alteration of the second branch of the trigeminal nerve activity following inferior alveolar nerve transection in rats.

    Yoshiyuki Tsuboi;Mamoru Takeda;Takeshi Tanimoto;Mizuho Ikeda

  • Satellite glial cell P2Y12 receptor in the trigeminal ganglion is involved in lingual neuropathic pain mechanisms in rats

    Ayano Katagiri;Ayano Katagiri;Masamichi Shinoda;Kuniya Honda;Akira Toyofuku

  • Diencephalic projections from the superficial and deep laminae of the medullary dorsal horn in the rat.

    Koichi Iwata;Dan R. Kenshalo;Ronald Dubner;Richard L. Nahin

  • Mechanisms involved in modulation of trigeminal primary afferent activity in rats with peripheral mononeuropathy

    Junichi Kitagawa;Mamoru Takeda;Ikuko Suzuki;Jun Kadoi

  • Anterior cingulate cortical neuronal activity during perception of noxious thermal stimuli in monkeys.

    Koichi Iwata;Hiroshi Kamo;Akiko Ogawa;Yoshiyuki Tsuboi

  • Organization of pERK‐immunoreactive cells in trigeminal spinal nucleus caudalis and upper cervical cord following capsaicin injection into oral and craniofacial regions in rats

    Noboru Noma;Yoshiyuki Tsuboi;Masahiro Kondo;Mitsuhiko Matsumoto

  • Alteration of Medullary Dorsal Horn Neuronal Activity Following Inferior Alveolar Nerve Transection in Rats

    Koichi Iwata;Takao Imai;Yoshiyuki Tsuboi;Akimasa Tashiro;Akimasa Tashiro

  • Plastic changes in nociceptive transmission of the rat spinal cord with advancing age

    Koichi Iwata;Tetsuo Fukuoka;Eji Kondo;Yoshiyuki Tsuboi

  • Effects of central administration of opioids on facial scratching in monkeys

    D.A. Thomas;G.M. Williams;K. Iwata;D.R. Kenshalo

  • The medullary dorsal horn : a site of action of morphine in producing facial scratching in monkeys

    David A. Thomas;Gene M. Williams;Koichi Iwata;Daniel R. Kenshalo

  • Induction of Fos protein-like immunoreactivity in the trigeminal spinal nucleus caudalis and upper cervical cord following noxious and non-noxious mechanical stimulation of the whisker pad of the rat with an inferior alveolar nerve transection.

    Hirofumi Nomura;Akiko Ogawa;Akimasa Tashiro;Akimasa Tashiro;Toshifumi Morimoto

Frequent Co-Authors

Barry J. Sessle
Barry J. Sessle University of Toronto
Ke Ren
Ke Ren University of Maryland, Baltimore
Koichi Noguchi
Koichi Noguchi Hyogo College of Medicine
James W. Hu
James W. Hu University of Toronto
Ronald Dubner
Ronald Dubner University of Maryland, Baltimore
Jonathan O. Dostrovsky
Jonathan O. Dostrovsky University of Toronto
Yi Dai
Yi Dai Hyogo University of Health Sciences
David A. Bereiter
David A. Bereiter University of Minnesota
Richard L. Huganir
Richard L. Huganir Johns Hopkins University School of Medicine
Atsushi Tokunaga
Atsushi Tokunaga Hyogo College of Medicine

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