World's Best Scientists 2026 revealed!

D-Index & Metrics

Neuroscience

D-Index
57
Citations
13255
World Ranking
4318
National Ranking
127

Masako Okawa 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 Masako Okawa sits on this spectrum.

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 scientists 868–877 publications: 3 scientists 878–886 publications: 6 scientists 887+ publications: 100 scientists
38 publications 887+

This scientist: 190 publications — 59th percentile

59% of scientists in this discipline score the same or lower.

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

Masako Okawa 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 Masako Okawa sits on this spectrum.

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 D-Index 163+

This scientist: 57 D-Index — 56th percentile

56% of scientists in this discipline score the same or lower.

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

Overview

Masako Okawa is affiliated with Shiga University of Medical Science in Japan. Their research focuses primarily on sleep and related disorders, with significant contributions in the fields of neuroscience, psychology, and social sciences. The subfields that characterize their work include experimental and cognitive psychology, cognitive neuroscience, education, endocrine and autonomic systems, and sociology and political science.

The main topics covered in Masako Okawa's research are:

  • Sleep and related disorders
  • Sleep and wakefulness research
  • Youth substance use and school attendance
  • Circadian rhythm and melatonin
  • Impact of technology on adolescents
  • Child development and digital technology
  • Gender and technology in education

Among their recent papers are the following:

  • "Effects of Cognitive Behavioral Therapy for Insomnia on Subjective-Objective Sleep Discrepancy in Patients with Primary Insomnia: a Small-Scale Cohort Pilot Study," 2021, International Journal of Behavioral Medicine
  • "A rare genetic variant in the cleavage site of prepro-orexin is associated with idiopathic hypersomnia," 2022, npj Genomic Medicine
  • "Genome-wide association study of idiopathic hypersomnia in a Japanese population," 2021, Sleep and Biological Rhythms
  • "Prevalence and associated factors of circadian rhythm sleep-wake disorders and insomnia among visually impaired Japanese individuals," 2021, BMC Public Health
  • "Sleep-health care and education are urgently needed for excessive screen time and sleep problems among school-age children," 2022, Sleep and Biological Rhythms

The frequent venues for Masako Okawa's publications include:

  • International Journal of Behavioral Medicine
  • Sleep and Biological Rhythms
  • npj Genomic Medicine
  • BMC Public Health

Collaborators commonly working with Masako Okawa include Naoto Yamada, Yuichi Inoue, Kohei Nishikawa, Kenichi Kuriyama, and Takuya Yoshiike. These coauthors have contributed to multiple studies, reflecting collaborative research efforts in their shared fields.

Masako Okawa's work spans comprehensive investigations into cognitive and biological aspects of sleep disorders, exploring both genetic underpinnings and behavioral interventions. Their research also addresses the impact of technology on adolescent sleep patterns and the need for sleep-health education among young populations.

Best Publications

  • Psychometric assessment of subjective sleep quality using the Japanese version of the Pittsburgh Sleep Quality Index (PSQI-J) in psychiatric disordered and control subjects

    Yuriko Doi;Masumi Minowa;Makoto Uchiyama;Masako Okawa

  • A schizophrenia-associated mutation of DISC1 perturbs cerebral cortex development.

    Atsushi Kamiya;Atsushi Kamiya;Ken Ichiro Kubo;Toshifumi Tomoda;Toshifumi Tomoda;Manabu Takaki

  • Association of structural polymorphisms in the human period3 gene with delayed sleep phase syndrome

    Takashi Ebisawa;Makoto Uchiyama;Naofumi Kajimura;Kazuo Mishima

  • Disrupted-in-Schizophrenia-1 (DISC-1): Mutant truncation prevents binding to NudE-like (NUDEL) and inhibits neurite outgrowth

    Yuji Ozeki;Toshifumi Tomoda;John Kleiderlein;Atsushi Kamiya

  • Morning bright light therapy for sleep and behavior disorders in elderly patients with dementia

    K. Mishima;M. Okawa;Y. Hishikawa;S. Hozumi

  • Incidental Lewy body disease in a patient with REM sleep behavior disorder

    M. Uchiyama;K. Isse;K. Tanaka;N. Yokota

  • Sleep loss and daytime sleepiness in the general adult population of Japan.

    Xianchen Liu;Makoto Uchiyama;Keiko Kim;Masako Okawa

  • Diminished melatonin secretion in the elderly caused by insufficient environmental illumination.

    K. Mishima;M. Okawa;T. Shimizu;Y. Hishikawa

  • Prevalence of sleep disturbance and hypnotic medication use in relation to sociodemographic factors in the general Japanese adult population.

    Yuriko Doi;Masumi Minowa;Masako Okawa;Makoto Uchiyama

  • Melatonin secretion rhythm disorders in patients with senile dementia of Alzheimer’s type with disturbed sleep–waking

    Kazuo Mishima;Tozawa Tozawa;Kohtoku Satoh;Yasuhiro Matsumoto

  • Prevalence and correlates of self-reported sleep problems among Chinese adolescents

    Xianchen Liu;Makoto Uchiyama;Masako Okawa;Hiroshi Kurita

  • Circadian rhythm disorders in sleep-waking and body temperature in elderly patients with dementia and their treatment.

    M Okawa;K Mishima;Y Hishikawa;S Hozumi

  • Activity of Midbrain Reticular Formation and Neocortex during the Progression of Human Non-Rapid Eye Movement Sleep

    Naofumi Kajimura;Makoto Uchiyama;Yutaka Takayama;Sunao Uchida

  • Sleep and mood disorders

    Ruth M. Benca;Masako Okawa;Makoto Uchiyama;Shigeru Ozaki

  • Mutation screening of the human Clock gene in circadian rhythm sleep disorders.

    Toshio Iwase;Naofumi Kajimura;Makoto Uchiyama;Takashi Ebisawa

  • Melatonin Rhythms in Delayed Sleep Phase Syndrome

    Kayo Shibui;Makoto Uchiyama;Masako Okawa

  • Subjective sleep quality and sleep problems in the general Japanese adult population.

    Yuriko Doi;Masumi Minowa;Makoto Uchiyama;Masako Okawa

  • A missense variation in human Casein kinase I Epsilon gene that induces functional alteration and shows an inverse association with circadian rhythm sleep disorders

    Atsuko Takano;Makoto Uchiyama;Naofumi Kajimura;Kazuo Mishima

  • Serine racemase binds to PICK1: potential relevance to schizophrenia.

    K Fujii;K Maeda;K Maeda;T Hikida;A K Mustafa

  • Randomized, DIM Light Controlled, Crossover test of Morning Bright Light Therapy for Rest-Activity Rhythm Disorders in Patients with Vascular Dementia and Dementia of Alzheimer's type

    Kazuo Mishima;Yasuo Hishikawa;Masako Okawa

  • Prolonged interval from body temperature nadir to sleep offset in patients with delayed sleep phase syndrome

    Shigeru Ozaki;Makoto Uchiyama;Shuichiro Shirakawa;Masako Okawa

  • Four congenitally blind children with circadian sleep-wake rhythm disorder.

    M. Okawa;T. Nanami;S. Wada;T. Shimizu

Frequent Co-Authors

Kiyohisa Takahashi
Kiyohisa Takahashi Shiga University of Medical Science
Kazuo Mishima
Kazuo Mishima Akita University
Akira Sawa
Akira Sawa Johns Hopkins University
Hiroshi Matsuda
Hiroshi Matsuda Tokyo University of Agriculture and Technology
Mary E. Hatten
Mary E. Hatten Rockefeller University
Harumasa Takano
Harumasa Takano National Institutes for Quantum and Radiological Science and Technology
Takashi Kanbayashi
Takashi Kanbayashi University of Tsukuba
Solomon H. Snyder
Solomon H. Snyder Johns Hopkins University School of Medicine
Norio Ozaki
Norio Ozaki Nagoya University
Jenae M. Neiderhiser
Jenae M. Neiderhiser Pennsylvania State University

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