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Gert Jan Lammers

Gert Jan Lammers

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Neuroscience 69 2593 2370 84 79 259 20837

Gert Jan Lammers publications per year

The chart shows the history of publications by Gert Jan Lammers between 1991 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Gert Jan Lammers published across 35 years, from 1991 to 2025, averaging 8.7 papers a year. Output peaked at 23 publications in 2020. 28 of the 304 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1991 to 2025. Vertical axis: number of publications, 0 to 23. Peak 23 publications in 2020. 1991: 2 publications 1992: 2 publications 1993: 1 publication 1994: 0 publications 1995: 2 publications 1996: 2 publications 1997: 1 publication 1998: 2 publications 1999: 5 publications 2000: 3 publications 2001: 3 publications 2002: 12 publications 2003: 8 publications 2004: 7 publications 2005: 5 publications 2006: 8 publications 2007: 9 publications 2008: 8 publications 2009: 4 publications 2010: 11 publications 2011: 12 publications 2012: 12 publications 2013: 12 publications 2014: 12 publications 2015: 11 publications 2016: 14 publications 2017: 6 publications 2018: 16 publications 2019: 14 publications 2020: 23 publications 2021: 16 publications 2022: 17 publications 2023: 16 publications 2024: 13 publications 2025: 15 publications
1991 2025

304 publications in total across all disciplines

View publications per year as a table
Gert Jan Lammers: publications per year, 1991 to 2025
Year Publications
1991 2
1992 2
1993 1
1994 0
1995 2
1996 2
1997 1
1998 2
1999 5
2000 3
2001 3
2002 12
2003 8
2004 7
2005 5
2006 8
2007 9
2008 8
2009 4
2010 11
2011 12
2012 12
2013 12
2014 12
2015 11
2016 14
2017 6
2018 16
2019 14
2020 23
2021 16
2022 17
2023 16
2024 13
2025 15
Total 304
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Gert Jan Lammers publications per year - data summary

  • Gert Jan Lammers, a Neuroscience scholar from Leiden University, has 304 publications recorded across 35 years, from 1991 to 2025.
  • The oldest publication on record dates to 1991 and the most recent to 2025.
  • The most productive year is 2020, with 23 publications.
  • The least productive years with any output are 1993 and 1997, with 1 publication each.
  • 1 of the 35 years in the span carries no publications at all (1994).
  • The rate of publication averages 8.7 papers per year over the whole span, or 8.9 per year counting only the 34 years with at least one publication.
  • The last 5 years on the chart (2021-2025) hold 77 publications, 25% of the career total.
  • Split into equal eras - 1991-2002: 35 publications (2.9 per year); 2003-2014: 108 publications (9.0 per year); 2015-2025: 161 publications (14.6 per year).
  • Comparing the opening and closing eras, the overall trend of publication is rising.

Gert Jan Lammers 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 Gert Jan Lammers 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, 258–267 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: 259 publications — 76th percentile

76% 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
258–267 176 259
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
Download as CSV

Gert Jan Lammers publication distribution in Neuroscience in 2026 - data summary

  • The chart plots the publication count of all 9,597 Neuroscience scientists ranked by Research.com in 2026, grouped into 86 ranges running from 38–47 to 887+ publications.
  • Gert Jan Lammers, a Neuroscience scholar from Leiden University, records 259 publications - the 76th percentile of the discipline.
  • 76% of ranked Neuroscience scientists score the same or lower than Gert Jan Lammers, and about 24% score higher.
  • The median of the discipline falls in the 158–167 publications range, and Gert Jan Lammers ranks above the median.
  • The most crowded range is 98–107 publications, holding 539 scientists (6% of the field).
  • 76% of the field sits in the lowest quarter of the value range (up to 248–257 publications), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 887 publications or more, 100 scientists in all (1% of the field).

Gert Jan Lammers 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 Gert Jan Lammers 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, 68–69 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: 69 D-Index — 73rd percentile

73% 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 69
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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Gert Jan Lammers D-index placement in Neuroscience in 2026 - data summary

  • The chart plots the discipline H-index (D-index) of all 9,597 Neuroscience scientists ranked by Research.com in 2026, grouped into 68 ranges running from 30–31 to 163+ D-Index.
  • Gert Jan Lammers, a Neuroscience scholar from Leiden University, records 69 D-Index - the 73rd percentile of the discipline.
  • 73% of ranked Neuroscience scientists score the same or lower than Gert Jan Lammers, and about 27% score higher.
  • The median of the discipline falls in the 54–55 D-Index range, and Gert Jan Lammers ranks above the median.
  • The most crowded range is 46–47 D-Index, holding 512 scientists (5% of the field).
  • 65% of the field sits in the lowest quarter of the value range (up to 62–63 D-Index), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 163 D-Index or more, 100 scientists in all (1% of the field).

Overview

Gert Jan Lammers is affiliated with Leiden University in the Netherlands and conducts research primarily in the fields of neuroscience and psychology. Their work focuses extensively on topics related to sleep and wakefulness, encompassing sleep disorders, circadian rhythms, and related physiological and psychological processes.

The main fields of study for Lammers include:

  • Neuroscience
  • Psychology

Their subfields of study further specify areas within these disciplines, such as:

  • Cognitive Neuroscience
  • Experimental and Cognitive Psychology
  • Endocrine and Autonomic Systems
  • Physiology
  • Epidemiology

Lammers' research covers several main topics:

  • Sleep and Wakefulness Research
  • Sleep and related disorders
  • Circadian rhythm and melatonin
  • Restless Legs Syndrome Research
  • Sleep and Work-Related Fatigue
  • Obstructive Sleep Apnea Research
  • Regulation of Appetite and Obesity

The scientist has published numerous papers in notable venues, frequently contributing to:

  • Sleep Medicine
  • SLEEP
  • Journal of Sleep Research
  • bioRxiv (Cold Spring Harbor Laboratory)
  • Sleep Medicine Reviews

Selected recent publications authored or co-authored by Gert Jan Lammers include:

  • Diagnosis of central disorders of hypersomnolence: A reappraisal by European experts, 2020, Sleep Medicine Reviews
  • European guideline and expert statements on the management of narcolepsy in adults and children, 2021, European Journal of Neurology
  • European guideline and expert statements on the management of narcolepsy in adults and children, 2021, Journal of Sleep Research
  • Safety and efficacy of pitolisant in children aged 6 years or older with narcolepsy with or without cataplexy: a double-blind, randomised, placebo-controlled trial, 2023, The Lancet Neurology
  • Vigilance: discussion of related concepts and proposal for a definition, 2021, Sleep Medicine

Frequent collaborators in Lammers' research include:

  • Rolf Fronczek
  • Sebastiaan Overeem
  • Yves Dauvilliers
  • Claudio L. Bassetti
  • Ramin Khatami

Best Publications

  • A mutation in a case of early onset narcolepsy and a generalized absence of hypocretin peptides in human narcoleptic brains

    Christelle Peyron;Juliette Faraco;William Rogers;Beth Ripley

  • Hypocretin (orexin) deficiency in human narcolepsy

    Seiji Nishino;Beth Ripley;Sebastiaan Overeem;Gert Jan Lammers

  • The role of cerebrospinal fluid hypocretin measurement in the diagnosis of narcolepsy and other hypersomnias.

    Emmanuel Mignot;Gert Jan Lammers;Beth Ripley;Michele Okun

  • Narcolepsy - clinical spectrum, aetiopathophysiology, diagnosis and treatment.

    Claudio L. A. Bassetti;Antoine Adamantidis;Denis Burdakov;Denis Burdakov;Denis Burdakov;Fang Han

  • Low cerebrospinal fluid hypocretin (orexin) and altered energy homeostasis in human narcolepsy

    Seiji Nishino;Beth Ripley;Sebastiaan Overeem;Sebastiaan Overeem;Sona Nevsimalova

  • A Single Night of Partial Sleep Deprivation Induces Insulin Resistance in Multiple Metabolic Pathways in Healthy Subjects

    Esther Donga;Marieke van Dijk;J. Gert van Dijk;Nienke R. Biermasz

  • CSF hypocretin/orexin levels in narcolepsy and other neurological conditions.

    B Ripley;S Overeem;N Fujiki;S Nevsimalova

  • Narcolepsy: clinical features, new pathophysiologic insights, and future perspectives.

    Sebastiaan Overeem;Emmanuel Mignot;J. GertvanDijk;Gert Jan Lammers

  • Hypocretin (orexin) loss in Parkinson's disease

    Rolf Fronczek;Sebastiaan Overeem;Sandy Y Y Lee;Ingrid M Hegeman

  • Pitolisant versus placebo or modafinil in patients with narcolepsy : a double-blind, randomised trial

    Yves Dauvilliers;Claudio Bassetti;Gert Jan Lammers;Isabelle Arnulf

  • EFNS guidelines on management of narcolepsy.

    M. Billiard;C. Bassetti;Y. Dauvilliers;L. Dolenc-Groselj

  • Elevated Tribbles homolog 2–specific antibody levels in narcolepsy patients

    Vesna Cvetkovic-Lopes;Laurence Bayer;Stéphane Dorsaz;Stéphanie Maret

  • The incidence of narcolepsy in Europe: Before, during, and after the influenza A(H1N1)pdm09 pandemic and vaccination campaigns

    Leonoor Wijnans;Coralie Lecomte;Corinne de Vries;Daniel Weibel

  • Hypocretin (orexin) loss in Alzheimer's disease.

    Rolf Fronczek;Rolf Fronczek;Sarita van Geest;Sarita van Geest;Marijke Frölich;Sebastiaan Overeem

  • Transesophageal echocardiography is superior to transthoracic echocardiography in management of patients of any age with transient ischemic attack or stroke.

    Sebastiaan F.T.M. de Bruijn;Willem R.P. Agema;Gert Jan Lammers;Ernst E. van der Wall

  • Gammahydroxybutyrate and narcolepsy : a double-blind placebo-controlled study

    G. J. Lammers;J. Arends;A. C. Declerck;M. D. Ferrari

  • ImmunoChip Study Implicates Antigen Presentation to T Cells in Narcolepsy

    Juliette Faraco;Ling Lin;Birgitte Rahbek Kornum;Birgitte Rahbek Kornum;Eimear E. Kenny

  • Clinical, polysomnographic and genome-wide association analyses of narcolepsy with cataplexy: a European Narcolepsy Network study

    Gianina Luca;José Haba-Rubio;Yves Dauvilliers;Gert-Jan Lammers

  • Hypocretin deficiency in narcoleptic humans is associated with abdominal obesity.

    Simon W Kok;Sebastiaan Overeem;Tommy L S Visscher;Gert Jan Lammers

  • Genome-wide association study identifies new HLA class II haplotypes strongly protective against narcolepsy

    Hyun Hor;Hyun Hor;Zoltán Kutalik;Zoltán Kutalik;Yves Dauvilliers;Armand Valsesia;Armand Valsesia;Armand Valsesia

  • Partial Sleep Restriction Decreases Insulin Sensitivity in Type 1 Diabetes

    Esther Donga;Marieke G Van Dijk;J. Gert van Dijk;Nienke R. Biermasz

  • Sleep and circadian rhythm alterations correlate with depression and cognitive impairment in Huntington's disease.

    N. Ahmad Aziz;Galia V. Anguelova;Johan Marinus;Gert Jan Lammers

  • The clinical features of cataplexy: A questionnaire study in narcolepsy patients with and without hypocretin-1 deficiency

    Sebastiaan Overeem;Sofie J. van Nues;Wendy L. van der Zande;Claire E. Donjacour

  • Hypocretin-1 CSF levels in anti-Ma2 associated encephalitis

    S. Overeem;J. Dalmau;L. Bataller;S. Nishino

Frequent Co-Authors

Yves Dauvilliers
Yves Dauvilliers University of Montpellier
Geert Mayer
Geert Mayer Philipp University of Marburg
Claudio L. Bassetti
Claudio L. Bassetti University of Bern
J. Gert van Dijk
J. Gert van Dijk Leiden University
Emmanuel Mignot
Emmanuel Mignot Stanford University
Hanno Pijl
Hanno Pijl Leiden University Medical Center
J.G. van Dijk
J.G. van Dijk Leiden University
Giuseppe Plazzi
Giuseppe Plazzi University of Bologna
Johannes A. Romijn
Johannes A. Romijn University of Amsterdam
Mehdi Tafti
Mehdi Tafti University of Lausanne

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