World's Best Scientists 2026 revealed!
Masaomi Iyo

Masaomi Iyo

D-Index & Metrics

Medicine

D-Index
77
Citations
24686
World Ranking
18348
National Ranking
589

Masaomi Iyo publication distribution in Medicine in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Medicine in 2026. The highlighted bar marks where Masaomi Iyo sits on this spectrum.

101–120 publications: 5 scientists 121–140 publications: 26 scientists 141–160 publications: 73 scientists 161–180 publications: 155 scientists 181–200 publications: 230 scientists 201–220 publications: 363 scientists 221–240 publications: 487 scientists 241–260 publications: 545 scientists 261–280 publications: 722 scientists 281–300 publications: 768 scientists 301–320 publications: 834 scientists 321–340 publications: 895 scientists 341–360 publications: 922 scientists 361–380 publications: 838 scientists 381–400 publications: 861 scientists 401–420 publications: 918 scientists 421–440 publications: 806 scientists 441–460 publications: 771 scientists 461–480 publications: 751 scientists 481–500 publications: 713 scientists 501–520 publications: 617 scientists 521–540 publications: 611 scientists 541–560 publications: 537 scientists 561–580 publications: 504 scientists 581–600 publications: 509 scientists 601–620 publications: 396 scientists 621–640 publications: 386 scientists 641–660 publications: 371 scientists 661–680 publications: 340 scientists 681–700 publications: 336 scientists 701–720 publications: 307 scientists 721–740 publications: 259 scientists 741–760 publications: 230 scientists 761–780 publications: 228 scientists 781–800 publications: 217 scientists 801–820 publications: 204 scientists 821–840 publications: 186 scientists 841–860 publications: 177 scientists 861–880 publications: 155 scientists 881–900 publications: 139 scientists 901–920 publications: 145 scientists 921–940 publications: 116 scientists 941–960 publications: 133 scientists 961–980 publications: 91 scientists 981–1,000 publications: 96 scientists 1,001–1,020 publications: 77 scientists 1,021–1,040 publications: 70 scientists 1,041–1,060 publications: 63 scientists 1,061–1,080 publications: 77 scientists 1,081–1,100 publications: 49 scientists 1,101–1,120 publications: 54 scientists 1,121–1,140 publications: 49 scientists 1,141–1,160 publications: 51 scientists 1,161–1,180 publications: 35 scientists 1,181–1,200 publications: 39 scientists 1,201–1,220 publications: 26 scientists 1,221–1,240 publications: 37 scientists 1,241–1,260 publications: 36 scientists 1,261–1,280 publications: 27 scientists 1,281–1,300 publications: 32 scientists 1,301–1,320 publications: 28 scientists 1,321–1,340 publications: 17 scientists 1,341–1,360 publications: 30 scientists 1,361–1,380 publications: 28 scientists 1,381–1,400 publications: 17 scientists 1,401–1,420 publications: 21 scientists 1,421–1,440 publications: 15 scientists 1,441–1,460 publications: 12 scientists 1,461–1,480 publications: 12 scientists 1,481–1,500 publications: 18 scientists 1,501–1,520 publications: 14 scientists 1,521–1,540 publications: 17 scientists 1,541–1,560 publications: 15 scientists 1,561–1,580 publications: 6 scientists 1,581–1,600 publications: 2 scientists 1,601–1,620 publications: 12 scientists 1,621–1,640 publications: 11 scientists 1,641–1,660 publications: 8 scientists 1,661–1,680 publications: 5 scientists 1,681–1,700 publications: 5 scientists 1,701–1,720 publications: 10 scientists 1,721–1,740 publications: 12 scientists 1,741–1,760 publications: 14 scientists 1,761–1,780 publications: 6 scientists 1,781–1,795 publications: 5 scientists 1,796+ publications: 100 scientists
101 publications 1,796+

This scientist: 525 publications — 62nd percentile

62% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,796 publications or more.

Masaomi Iyo D-index placement in Medicine in 2026

The chart shows the D-index (discipline H-index) distribution of Medicine scientists ranked by Research.com in 2026. The highlighted bar marks where Masaomi Iyo sits on this spectrum.

70–71 D-Index: 226 scientists 72–73 D-Index: 391 scientists 74–75 D-Index: 574 scientists 76–77 D-Index: 730 scientists 78–79 D-Index: 891 scientists 80–81 D-Index: 972 scientists 82–83 D-Index: 1,027 scientists 84–85 D-Index: 1,003 scientists 86–87 D-Index: 960 scientists 88–89 D-Index: 970 scientists 90–91 D-Index: 922 scientists 92–93 D-Index: 839 scientists 94–95 D-Index: 808 scientists 96–97 D-Index: 779 scientists 98–99 D-Index: 668 scientists 100–101 D-Index: 611 scientists 102–103 D-Index: 630 scientists 104–105 D-Index: 513 scientists 106–107 D-Index: 541 scientists 108–109 D-Index: 445 scientists 110–111 D-Index: 429 scientists 112–113 D-Index: 400 scientists 114–115 D-Index: 393 scientists 116–117 D-Index: 318 scientists 118–119 D-Index: 302 scientists 120–121 D-Index: 287 scientists 122–123 D-Index: 255 scientists 124–125 D-Index: 256 scientists 126–127 D-Index: 252 scientists 128–129 D-Index: 230 scientists 130–131 D-Index: 179 scientists 132–133 D-Index: 168 scientists 134–135 D-Index: 163 scientists 136–137 D-Index: 159 scientists 138–139 D-Index: 134 scientists 140–141 D-Index: 134 scientists 142–143 D-Index: 118 scientists 144–145 D-Index: 109 scientists 146–147 D-Index: 106 scientists 148–149 D-Index: 74 scientists 150–151 D-Index: 79 scientists 152–153 D-Index: 80 scientists 154–155 D-Index: 87 scientists 156–157 D-Index: 57 scientists 158–159 D-Index: 74 scientists 160–161 D-Index: 69 scientists 162–163 D-Index: 60 scientists 164–165 D-Index: 53 scientists 166–167 D-Index: 39 scientists 168–169 D-Index: 42 scientists 170–171 D-Index: 32 scientists 172–173 D-Index: 39 scientists 174–175 D-Index: 40 scientists 176–177 D-Index: 28 scientists 178–179 D-Index: 19 scientists 180–181 D-Index: 23 scientists 182–183 D-Index: 31 scientists 184–185 D-Index: 18 scientists 186–187 D-Index: 20 scientists 188–189 D-Index: 22 scientists 190–191 D-Index: 13 scientists 192–193 D-Index: 21 scientists 194–195 D-Index: 12 scientists 196–197 D-Index: 12 scientists 198–199 D-Index: 14 scientists 200–201 D-Index: 15 scientists 202–203 D-Index: 13 scientists 204–205 D-Index: 10 scientists 206–207 D-Index: 8 scientists 208–209 D-Index: 4 scientists 210–211 D-Index: 12 scientists 212–213 D-Index: 11 scientists 214–215 D-Index: 10 scientists 216 D-Index: 4 scientists 217+ D-Index: 98 scientists
70 D-Index 217+

This scientist: 77 D-Index — 10th percentile

10% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 217 D-Index or more.

Overview

Masaomi Iyo is affiliated with Chiba University in Japan and focuses on a range of topics within medicine, psychology, and neuroscience. Their research primarily addresses psychiatry and mental health, clinical psychology, and neurology, with additional attention to cellular and molecular neuroscience and cognitive neuroscience.

The topics covered in their work include:

  • Schizophrenia research and treatment
  • Bipolar disorder and treatment
  • Neurological disorders and treatments
  • Obsessive-compulsive spectrum disorders
  • Treatment of major depression
  • COVID-19 and mental health
  • Tryptophan and brain disorders

Recent published papers that list Masaomi Iyo as an author include:

  • "Relationship between perception and anxiety about COVID-19 infection and risk behaviors for spreading infection: A national survey in Japan," 2020, Brain Behavior & Immunity - Health
  • "Autistic traits and cognitive profiles of treatment-resistant schizophrenia," 2020, Schizophrenia Research Cognition
  • "Perception of and anxiety about COVID-19 infection and risk behaviors for spreading infection: an international comparison," 2021, Annals of General Psychiatry
  • "Platelet-derived growth factor BB: A potential diagnostic blood biomarker for differentiating bipolar disorder from major depressive disorder," 2020, Journal of Psychiatric Research
  • "Efficacy and safety of lurasidone in acutely psychotic patients with schizophrenia: A 6-week, randomized, double-blind, placebo-controlled study," 2021, Psychiatry and Clinical Neurosciences

Frequent coauthors in Masaomi Iyo's collaborative research include:

  • Nobuhisa Kanahara
  • Tomihisa Niitsu
  • Yasunori Oda
  • Tasuku Hashimoto
  • Hiroshi Kimura

The scholar's work is regularly published in the following venues:

  • Asian Journal of Psychiatry
  • Psychiatry and Clinical Neurosciences Reports
  • Psychiatry Research
  • Pharmacology Biochemistry and Behavior
  • Journal of Psychopharmacology

Masaomi Iyo's research integrates clinical and biological perspectives, focusing on psychiatric disorders such as schizophrenia and bipolar disorder, as well as the psychological and neurological effects of infectious disease contexts like COVID-19. Their multidisciplinary approach spans clinical trials, diagnostic biomarker identification, and psychological risk behavior analysis.

Best Publications

  • Alterations of serum levels of brain-derived neurotrophic factor (BDNF) in depressed patients with or without antidepressants.

    Eiji Shimizu;Kenji Hashimoto;Naoe Okamura;Kaori Koike

  • Decreased prefrontal dopamine D1 receptors in schizophrenia revealed by PET

    Yoshiro Okubo;Yoshiro Okubo;Tetsuya Suhara;Kazutoshi Suzuki;Kaoru Kobayashi

  • Increased levels of glutamate in brains from patients with mood disorders.

    Kenji Hashimoto;Akira Sawa;Masaomi Iyo

  • Critical role of brain-derived neurotrophic factor in mood disorders

    Kenji Hashimoto;Eiji Shimizu;Masaomi Iyo

  • Decreased serum levels of D-serine in patients with schizophrenia: evidence in support of the N-methyl-D-aspartate receptor hypofunction hypothesis of schizophrenia.

    Kenji Hashimoto;Takeshi Fukushima;Eiji Shimizu;Naoya Komatsu

  • Immune activation during pregnancy in mice leads to dopaminergic hyperfunction and cognitive impairment in the offspring: a neurodevelopmental animal model of schizophrenia.

    Kimiyoshi Ozawa;Kenji Hashimoto;Takashi Kishimoto;Eiji Shimizu

  • Methamphetamine-related psychiatric symptoms and reduced brain dopamine transporters studied with PET.

    Yoshimoto Sekine;Masaomi Iyo;Yasuomi Ouchi;Tsutomu Matsunaga

  • Ethnic difference of the BDNF 196G/A (val66met) polymorphism frequencies: The possibility to explain ethnic mental traits

    Eiji Shimizu;Kenji Hashimoto;Masaomi Iyo

  • Measurement of acetylcholinesterase by positron emission tomography in the brains of healthy controls and patients with Alzheimer's disease

    Masaomi Iyo;Hiroki Namba;Kiyoshi Fukushi;Hitoshi Shinotoh;Hitoshi Shinotoh

  • Brain Serotonin Transporter Density and Aggression in Abstinent Methamphetamine Abusers

    Yoshimoto Sekine;Yasuomi Ouchi;Nori Takei;Etsuji Yoshikawa

  • Reduced D-serine to total serine ratio in the cerebrospinal fluid of drug naive schizophrenic patients.

    Kenji Hashimoto;Göran Engberg;Eiji Shimizu;Conny Nordin

  • Association of dopamine transporter loss in the orbitofrontal and dorsolateral prefrontal cortices with methamphetamine-related psychiatric symptoms.

    Yoshimoto Sekine;Yoshio Minabe;Yasuomi Ouchi;Nori Takei

  • Increased serum levels of glutamate in adult patients with autism

    Atsuko Shinohe;Kenji Hashimoto;Kazuhiko Nakamura;Masatsugu Tsujii

  • Decreased Serum Levels of Mature Brain-Derived Neurotrophic Factor (BDNF), but Not Its Precursor proBDNF, in Patients with Major Depressive Disorder

    Taisuke Yoshida;Masatomo Ishikawa;Tomihisa Niitsu;Michiko Nakazato

  • Negative Correlation between Brain Glutathione Level and Negative Symptoms in Schizophrenia: A 3T 1H-MRS Study

    Daisuke Matsuzawa;Takayuki Obata;Yukihiko Shirayama;Hiroi Nonaka

  • Antipsychotic-Induced Dopamine Supersensitivity Psychosis: Pharmacology, Criteria, and Therapy.

    Guy Chouinard;Anne-Noël Samaha;Virginie-Anne Chouinard;Charles-Siegfried Peretti

  • Alterations in binding site density of dopamine transporter in the striatum, orbitofrontal cortex, and amygdala in early Parkinson's disease: Compartment analysis for β‐CFT binding with positron emission tomography

    Yasuomi Ouchi;Etuji Yoshikawa;Hiroyuki Okada;Masami Futatsubashi

  • Positron emission tomographic measurement of acetylcholinesterase activity reveals differential loss of ascending cholinergic systems in Parkinson's disease and progressive supranuclear palsy

    Hitoshi Shinotoh;Hitoshi Shinotoh;Hiroki Namba;Mika Yamaguchi;Mika Yamaguchi;Kiyoshi Fukushi

  • Decreased levels of serum brain-derived neurotrophic factor in female patients with eating disorders

    Michiko Nakazato;Kenji Hashimoto;Eiji Shimizu;Chikara Kumakiri

  • Serum brain-derived neurotrophic factor (BDNF) levels in schizophrenia are indistinguishable from controls.

    Eiji Shimizu;Kenji Hashimoto;Hiroyuki Watanabe;Naoya Komatsu

Frequent Co-Authors

Kenji Hashimoto
Kenji Hashimoto Chiba University
Norio Ozaki
Norio Ozaki Nagoya University
Ichiro Sora
Ichiro Sora Kobe University
Nakao Iwata
Nakao Iwata Fujita Health University
Yukihiko Shirayama
Yukihiko Shirayama Teikyo University
Yoshio Minabe
Yoshio Minabe Kanazawa University
Hitoshi Shinotoh
Hitoshi Shinotoh National Institutes for Quantum and Radiological Science and Technology
Masashi Ikeda
Masashi Ikeda Nagoya University
Takeo Yoshikawa
Takeo Yoshikawa RIKEN Center for Brain Science
Ryota Hashimoto
Ryota Hashimoto National Center of Neurology and Psychiatry

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