World's Best Scientists 2026 revealed!
Yoshitaka Oka

Yoshitaka Oka

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Neuroscience 50 5841 5372 188 177 178 6584

Yoshitaka Oka publications per year

The chart shows the history of publications by Yoshitaka Oka between 1980 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Yoshitaka Oka published across 47 years, from 1980 to 2026, averaging 4.8 papers a year. Output peaked at 20 publications in 2023. 8 of the 227 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1980 to 2026. Vertical axis: number of publications, 0 to 20. Peak 20 publications in 2023. 1980: 1 publication 1981: 1 publication 1982: 0 publications 1983: 1 publication 1984: 4 publications 1985: 2 publications 1986: 2 publications 1987: 6 publications 1988: 0 publications 1989: 3 publications 1990: 1 publication 1991: 5 publications 1992: 3 publications 1993: 1 publication 1994: 2 publications 1995: 3 publications 1996: 3 publications 1997: 5 publications 1998: 7 publications 1999: 3 publications 2000: 4 publications 2001: 11 publications 2002: 6 publications 2003: 5 publications 2004: 5 publications 2005: 2 publications 2006: 4 publications 2007: 9 publications 2008: 7 publications 2009: 10 publications 2010: 10 publications 2011: 7 publications 2012: 6 publications 2013: 7 publications 2014: 5 publications 2015: 7 publications 2016: 4 publications 2017: 1 publication 2018: 4 publications 2019: 3 publications 2020: 1 publication 2021: 7 publications 2022: 8 publications 2023: 20 publications 2024: 13 publications 2025: 7 publications 2026: 1 publication
1980 2026

227 publications in total across all disciplines

View publications per year as a table
Yoshitaka Oka: publications per year, 1980 to 2026
Year Publications
1980 1
1981 1
1982 0
1983 1
1984 4
1985 2
1986 2
1987 6
1988 0
1989 3
1990 1
1991 5
1992 3
1993 1
1994 2
1995 3
1996 3
1997 5
1998 7
1999 3
2000 4
2001 11
2002 6
2003 5
2004 5
2005 2
2006 4
2007 9
2008 7
2009 10
2010 10
2011 7
2012 6
2013 7
2014 5
2015 7
2016 4
2017 1
2018 4
2019 3
2020 1
2021 7
2022 8
2023 20
2024 13
2025 7
2026 1
Total 227
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Yoshitaka Oka 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 Yoshitaka Oka 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, 178–187 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: 178 publications — 55th percentile

55% 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
178–187 350 178
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
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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Yoshitaka Oka 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 Yoshitaka Oka 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, 50–51 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: 50 D-Index — 41st percentile

41% 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 50
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

What is he best known for?

The fields of study he is best known for:

  • Gene
  • Neuron
  • Internal medicine

Yoshitaka Oka spends much of his time researching Internal medicine, Endocrinology, Hypothalamus, Preoptic area and Terminal nerve. His Internal medicine study combines topics from a wide range of disciplines, such as Vertebrate and Nucleus. His Endocrinology study frequently draws connections between adjacent fields such as Cell biology.

His Hypothalamus research includes themes of Central nervous system and Estrogen. His Preoptic area study deals with Cerebrum intersecting with Olfactory bulb. His research in Terminal nerve focuses on subjects like Gonadotropin-releasing hormone, which are connected to Free nerve ending, Biocytin, Electrophysiology and Neuroscience.

His most cited work include:

  • Identification of KiSS-1 product kisspeptin and steroid-sensitive sexually dimorphic kisspeptin neurons in medaka (oryzias latipes). (174 citations)
  • Immunocytochemical demonstration of salmon GnRH and chicken GnRH-II in the brain of masu salmon, Oncorhynchus masou. (173 citations)
  • Lesions of gonadotropin-releasing hormone-immunoreactive terminal nerve cells: effects on the reproductive behavior of male dwarf gouramis. (142 citations)

What are the main themes of his work throughout his whole career to date?

His primary areas of investigation include Internal medicine, Endocrinology, Neuroscience, Terminal nerve and Gonadotropin-releasing hormone. His work carried out in the field of Internal medicine brings together such families of science as Nucleus, Cell biology and Neuron. His study involves Preoptic area, Dwarf gourami, Hypothalamus, Hormone and Kisspeptin, a branch of Endocrinology.

His research investigates the connection between Hypothalamus and topics such as Central nervous system that intersect with problems in Spinal cord. His research investigates the link between Neuroscience and topics such as Anatomy that cross with problems in Toad and Immunohistochemistry. His Gonadotropin-releasing hormone research is multidisciplinary, relying on both Patch clamp, Transgene and Gonadotropin.

He most often published in these fields:

  • Internal medicine (50.61%)
  • Endocrinology (50.00%)
  • Neuroscience (29.27%)

What were the highlights of his more recent work (between 2011-2020)?

  • Endocrinology (50.00%)
  • Internal medicine (50.61%)
  • Gonadotropin-releasing hormone (23.78%)

In recent papers he was focusing on the following fields of study:

The scientist’s investigation covers issues in Endocrinology, Internal medicine, Gonadotropin-releasing hormone, Neuroscience and Receptor. He regularly links together related areas like Nucleus in his Endocrinology studies. His Estrogen, Follicle-stimulating hormone, Androgen and Hormone study in the realm of Internal medicine connects with subjects such as Androgen receptor.

His work focuses on many connections between Gonadotropin-releasing hormone and other disciplines, such as Transgene, that overlap with his field of interest in Oryzias. The study incorporates disciplines such as Terminal nerve and Green fluorescent protein in addition to Neuroscience. The various areas that Yoshitaka Oka examines in his Preoptic area study include Cerebrum and In situ hybridization.

Between 2011 and 2020, his most popular works were:

  • A Neural Mechanism Underlying Mating Preferences for Familiar Individuals in Medaka Fish (77 citations)
  • Neuroanatomical evidence that kisspeptin directly regulates isotocin and vasotocin neurons. (57 citations)
  • Steroid Sensitive kiss2 Neurones in the Goldfish: Evolutionary Insights into the Duplicate Kisspeptin Gene‐Expressing Neurones (52 citations)

In his most recent research, the most cited papers focused on:

  • Gene
  • Neuron
  • Genetics

His primary scientific interests are in Internal medicine, Endocrinology, Preoptic area, Transgene and Gonadotropin-releasing hormone. His Internal medicine study frequently draws connections to other fields, such as Gene. His Endocrinology research incorporates themes from Evolutionary biology, Signal transduction and Gene duplication.

His Preoptic area research is under the purview of Nucleus. In his study, which falls under the umbrella issue of Transgene, Endogeny is strongly linked to Oryzias. His Gonadotropin-releasing hormone research is multidisciplinary, relying on both Vertebrate, Electrophysiology, Neuroscience and Follicle-stimulating hormone.

Best Publications

  • Identification of KiSS-1 product kisspeptin and steroid-sensitive sexually dimorphic kisspeptin neurons in medaka (oryzias latipes).

    Shinji Kanda;Yasuhisa Akazome;Takuya Matsunaga;Naoyuki Yamamoto

  • Immunocytochemical demonstration of salmon GnRH and chicken GnRH-II in the brain of masu salmon, Oncorhynchus masou.

    Masafumi Amano;Yoshitaka Oka;Katsumi Aida;Naoto Okumoto

  • Neurobiological mechanisms underlying GnRH pulse generation by the hypothalamus

    Kei-ichiro Maeda;Satoshi Ohkura;Yoshihisa Uenoyama;Yoshihiro Wakabayashi

  • Lesions of gonadotropin-releasing hormone-immunoreactive terminal nerve cells: effects on the reproductive behavior of male dwarf gouramis.

    Naoyuki Yamamoto;Yoshitaka Oka;Seiichiro Kawashima

  • Multiple gonadotropin-releasing hormone (GnRH)-immunoreactive systems in the brain of the dwarf gourami, Colisa lalia: immunohistochemistry and radioimmunoassay.

    Naoyuki Yamamoto;Yoshitaka Oka;Masafumi Amano;Katsumi Aida

  • Gonadotropin-releasing hormone (GnRH)-immunoreactive terminal nerve cells have intrinsic rhythmicity and project widely in the brain

    Yoshitaka Oka;Toshiya Matsushima

  • A Neural Mechanism Underlying Mating Preferences for Familiar Individuals in Medaka Fish

    Teruhiro Okuyama;Saori Yokoi;Hideki Abe;Hideki Abe;Yasuko Isoe

  • Immunocytochemical localization of sGnRH and cGnRH-II in the brain of goldfish, Carassius auratus

    Myung-Hee Kim;Yoshitaka Oka;Masafumi Amano;Makito Kobayashi

  • Possible Role of Oestrogen in Pubertal Increase of Kiss1/Kisspeptin Expression in Discrete Hypothalamic Areas of Female Rats

    K. Takase;Y. Uenoyama;N. Inoue;H. Matsui

  • Evolution of the Hypothalamic-Pituitary-Gonadal Axis Regulation in Vertebrates Revealed by Knockout Medaka.

    Akiko Takahashi;Shinji Kanda;Tomohiro Abe;Yoshitaka Oka

  • Telencephalic and preoptic areas integrate sexual behavior in hime salmon (landlocked red salmon, Oncorhynchus nerka): results of electrical brain stimulation experiments

    Masahiko Satou;Yoshitaka Oka;Makoto Kusunoki;Toshiya Matsushima

  • Functional and evolutionary insights into vertebrate kisspeptin systems from studies of fish brain.

    Y. Akazome;S. Kanda;K. Okubo;Y. Oka

  • Gonadotropin‐releasing hormone (GnRH) immunoreactive system in the brain of the dwarf gourami (Colisa lalia) as revealed by light microscopic immunocytochemistry using a monoclonal antibody to common amino acid sequence of GnRH

    Yoshitaka Oka;Masumi Ichikawa

  • Hypothalamic Kiss1 but Not Kiss2 Neurons Are Involved in Estrogen Feedback in Medaka (Oryzias latipes)

    Yuta Mitani;Shinji Kanda;Yasuhisa Akazome;Buntaro Zempo

  • Involvement of the telencephalic hemispheres and the preoptic area in sexual behavior of the male goldfish, Carassius auratus: a brain-lesion study

    Yoshimasa Koyama;Masahiko Satou;Yoshitaka Oka;Kazuo Ueda

  • Neuroanatomical evidence that kisspeptin directly regulates isotocin and vasotocin neurons.

    Shinji Kanda;Yasuhisa Akazome;Yuta Mitani;Kataaki Okubo

  • TMC4 is a novel chloride channel involved in high-concentration salt taste sensation.

    Yoichi Kasahara;Masataka Narukawa;Masataka Narukawa;Yoshiro Ishimaru;Shinji Kanda

  • Evolutionally Conserved Function of Kisspeptin Neuronal System Is Nonreproductive Regulation as Revealed by Nonmammalian Study

    Mikoto Nakajo;Shinji Kanda;Tomomi Karigo;Akiko Takahashi

  • Three GnRH systems in the brain and pituitary of a pleuronectiform fish, the barfin flounder Verasper moseri.

    Masafumi Amano;Yoshitaka Oka;Takeshi Yamanome;Koichi Okuzawa

  • Preoptic gonadotropin-releasing hormone (GnRH) neurons innervate the pituitary in teleosts.

    Naoyuki Yamamoto;Ishwar S Parhar;Nobuhiko Sawai;Nobuhiko Sawai;Yoshitaka Oka

  • Descending pathways to the spinal cord in the himé salmon (landlocked red salmon, oncorhynchus nerka)

    Yoshitaka Oka;Masahiko Satou;Kazuo Ueda

Frequent Co-Authors

Hideki Abe
Hideki Abe National Institute for Materials Science
Akiyoshi Takahashi
Akiyoshi Takahashi Kitasato University
Katsumi Aida
Katsumi Aida University of Tokyo
Kiyoshi Naruse
Kiyoshi Naruse National Institute for Basic Biology
Ishwar S. Parhar
Ishwar S. Parhar University of Toyama
Eric W. Roubos
Eric W. Roubos Radboud University
Minoru Tanaka
Minoru Tanaka Nagoya University
Hiroyuki Takeda
Hiroyuki Takeda University of Tokyo
Takeo Kubo
Takeo Kubo University of Tokyo
Yoshitaka Nagahama
Yoshitaka Nagahama Ehime University

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