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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Medicine 89 12735 11987 488 474 543 27736

Iris E. C. Sommer publications per year

The chart shows the history of publications by Iris E. C. Sommer between 1997 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Iris E. C. Sommer published across 30 years, from 1997 to 2026, averaging 20.9 papers a year. Output peaked at 57 publications in 2021. 36 of the 628 publications appeared in the last two years.

No. of publications
10 20 30 40 50
Bar chart. Horizontal axis: year, 1997 to 2026. Vertical axis: number of publications, 0 to 57. Peak 57 publications in 2021. 1997: 2 publications 1998: 1 publication 1999: 3 publications 2000: 2 publications 2001: 6 publications 2002: 3 publications 2003: 6 publications 2004: 3 publications 2005: 3 publications 2006: 1 publication 2007: 8 publications 2008: 11 publications 2009: 12 publications 2010: 25 publications 2011: 21 publications 2012: 34 publications 2013: 15 publications 2014: 29 publications 2015: 29 publications 2016: 28 publications 2017: 23 publications 2018: 41 publications 2019: 49 publications 2020: 56 publications 2021: 57 publications 2022: 55 publications 2023: 42 publications 2024: 27 publications 2025: 31 publications 2026: 5 publications
1997 2026

628 publications in total across all disciplines

View publications per year as a table
Iris E. C. Sommer: publications per year, 1997 to 2026
Year Publications
1997 2
1998 1
1999 3
2000 2
2001 6
2002 3
2003 6
2004 3
2005 3
2006 1
2007 8
2008 11
2009 12
2010 25
2011 21
2012 34
2013 15
2014 29
2015 29
2016 28
2017 23
2018 41
2019 49
2020 56
2021 57
2022 55
2023 42
2024 27
2025 31
2026 5
Total 628
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Iris E. C. Sommer publications per year - data summary

  • Iris E. C. Sommer, a Medicine scholar from University Medical Center Groningen, has 628 publications recorded across 30 years, from 1997 to 2026.
  • The oldest publication on record dates to 1997 and the most recent to 2026.
  • The most productive year is 2021, with 57 publications.
  • The least productive years with any output are 1998 and 2006, with 1 publication each.
  • The rate of publication averages 20.9 papers per year over the whole span, or 20.9 per year counting only the 30 years with at least one publication.
  • The last 5 years on the chart (2022-2026) hold 160 publications, 25% of the career total.
  • Split into equal eras - 1997-2006: 30 publications (3.0 per year); 2007-2016: 212 publications (21.2 per year); 2017-2026: 386 publications (38.6 per year).
  • Comparing the opening and closing eras, the overall trend of publication is rising.

Iris E. C. Sommer 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 Iris E. C. Sommer sits on this spectrum.

No. of scientists
200 400 600 800
Bar chart with 86 bars. Horizontal axis: publications, 101–120 to 1,796+. Vertical axis: number of scientists, 0 to 922. Most scientists, 922, have 341–360 publications. The last bar groups every scientist with 1,796 publications or more. The highlighted bar, 541–560 publications, is where this scientist sits. 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: 610 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
101–120 publications 1,796+

This scientist: 543 publications — 65th percentile

65% of scientists in this discipline score the same or lower.

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

View publications distribution as a table
Number of Medicine scientists by publication count, Research.com 2026 ranking edition. Based on 20,134 ranked scientists.
Publications Scientists This scientist
101–120 5
121–140 26
141–160 73
161–180 155
181–200 230
201–220 363
221–240 487
241–260 545
261–280 722
281–300 768
301–320 834
321–340 895
341–360 922
361–380 838
381–400 861
401–420 918
421–440 806
441–460 771
461–480 751
481–500 713
501–520 617
521–540 610
541–560 537 543
561–580 504
581–600 509
601–620 396
621–640 386
641–660 371
661–680 340
681–700 336
701–720 307
721–740 259
741–760 230
761–780 228
781–800 217
801–820 204
821–840 186
841–860 177
861–880 155
881–900 139
901–920 145
921–940 116
941–960 133
961–980 91
981–1,000 96
1,001–1,020 77
1,021–1,040 70
1,041–1,060 63
1,061–1,080 77
1,081–1,100 49
1,101–1,120 54
1,121–1,140 49
1,141–1,160 51
1,161–1,180 35
1,181–1,200 39
1,201–1,220 26
1,221–1,240 37
1,241–1,260 36
1,261–1,280 27
1,281–1,300 32
1,301–1,320 28
1,321–1,340 17
1,341–1,360 30
1,361–1,380 28
1,381–1,400 17
1,401–1,420 21
1,421–1,440 15
1,441–1,460 12
1,461–1,480 12
1,481–1,500 18
1,501–1,520 14
1,521–1,540 17
1,541–1,560 15
1,561–1,580 6
1,581–1,600 2
1,601–1,620 12
1,621–1,640 11
1,641–1,660 8
1,661–1,680 5
1,681–1,700 5
1,701–1,720 10
1,721–1,740 12
1,741–1,760 14
1,761–1,780 6
1,781–1,795 5
1,796+ 100
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Iris E. C. Sommer publication distribution in Medicine in 2026 - data summary

  • The chart plots the publication count of all 20,134 Medicine scientists ranked by Research.com in 2026, grouped into 86 ranges running from 101–120 to 1,796+ publications.
  • Iris E. C. Sommer, a Medicine scholar from University Medical Center Groningen, records 543 publications - the 65th percentile of the discipline.
  • 65% of ranked Medicine scientists score the same or lower than Iris E. C. Sommer, and about 35% score higher.
  • The median of the discipline falls in the 441–460 publications range, and Iris E. C. Sommer ranks above the median.
  • The most crowded range is 341–360 publications, holding 922 scientists (5% of the field).
  • 64% of the field sits in the lowest quarter of the value range (up to 521–540 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 1,796 publications or more, 100 scientists in all (<1% of the field).

Iris E. C. Sommer 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 Iris E. C. Sommer sits on this spectrum.

No. of scientists
250 500 750 1,000
Bar chart with 75 bars. Horizontal axis: D-Index, 70–71 to 217+. Vertical axis: number of scientists, 0 to 1,027. Most scientists, 1,027, have 82–83 D-Index. The last bar groups every scientist with 217 D-Index or more. The highlighted bar, 88–89 D-Index, is where this scientist sits. 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: 399 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
70–71 D-Index 217+

This scientist: 89 D-Index — 38th percentile

38% of scientists in this discipline score the same or lower.

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

View D-Index distribution as a table
Number of Medicine scientists by D-index, Research.com 2026 ranking edition. Based on 20,134 ranked scientists.
D-Index Scientists This scientist
70–71 226
72–73 391
74–75 574
76–77 730
78–79 891
80–81 972
82–83 1,027
84–85 1,003
86–87 960
88–89 970 89
90–91 922
92–93 839
94–95 808
96–97 779
98–99 668
100–101 611
102–103 630
104–105 513
106–107 541
108–109 445
110–111 429
112–113 399
114–115 393
116–117 318
118–119 302
120–121 287
122–123 255
124–125 256
126–127 252
128–129 230
130–131 179
132–133 168
134–135 163
136–137 159
138–139 134
140–141 134
142–143 118
144–145 109
146–147 106
148–149 74
150–151 79
152–153 80
154–155 87
156–157 57
158–159 74
160–161 69
162–163 60
164–165 53
166–167 39
168–169 42
170–171 32
172–173 39
174–175 40
176–177 28
178–179 19
180–181 23
182–183 31
184–185 18
186–187 20
188–189 22
190–191 13
192–193 21
194–195 12
196–197 12
198–199 14
200–201 15
202–203 13
204–205 10
206–207 8
208–209 4
210–211 12
212–213 11
214–215 10
216 4
217+ 98
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Iris E. C. Sommer D-index placement in Medicine in 2026 - data summary

  • The chart plots the discipline H-index (D-index) of all 20,134 Medicine scientists ranked by Research.com in 2026, grouped into 75 ranges running from 70–71 to 217+ D-Index.
  • Iris E. C. Sommer, a Medicine scholar from University Medical Center Groningen, records 89 D-Index - the 38th percentile of the discipline.
  • 38% of ranked Medicine scientists score the same or lower than Iris E. C. Sommer, and about 62% score higher.
  • The median of the discipline falls in the 94–95 D-Index range, and Iris E. C. Sommer ranks below the median.
  • The most crowded range is 82–83 D-Index, holding 1,027 scientists (5% of the field).
  • 70% of the field sits in the lowest quarter of the value range (up to 106–107 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 217 D-Index or more, 98 scientists in all (<1% of the field).

Overview

Iris E. C. Sommer is affiliated with the University Medical Center Groningen in the Netherlands. Their research primarily spans the fields of Medicine and Neuroscience, with a significant focus on Psychiatry and Mental Health, Cognitive Neuroscience, Clinical Psychology, Experimental and Cognitive Psychology, and Neurology.

The key topics explored in their work include:

  • Schizophrenia research and treatment
  • Functional Brain Connectivity Studies
  • Tryptophan and brain disorders
  • Mental Health and Psychiatry
  • Mental Health Research Topics
  • Psychosomatic Disorders and Their Treatments
  • Bipolar Disorder and Treatment

Sommer's recent papers reflect their ongoing contribution to these areas. Notable works include:

  • "The clinical course of schizophrenia in women and men-a nation-wide cohort study," 2020, Schizophrenia
  • "Efficacy of non-invasive brain stimulation on cognitive functioning in brain disorders: a meta-analysis," 2020, Psychological Medicine
  • "Anomalies in language as a biomarker for schizophrenia," 2020, Current Opinion in Psychiatry
  • "Abnormal synaptic pruning during adolescence underlying the development of psychotic disorders," 2021, Current Opinion in Psychiatry
  • "Language in schizophrenia: relation with diagnosis, symptomatology and white matter tracts," 2020, Schizophrenia

The frequent co-authors working alongside Sommer include Marieke Begemann, Janna N. de Boer, Sanne Brederoo, Sanne Koops, and Alban Voppel. These collaborations contribute to the breadth and depth of research in the neuroscientific and psychiatric domains.

Publications from Sommer often appear in specialized venues that feature extensive research on schizophrenia and related fields. Commonly used publication outlets include:

  • Schizophrenia Bulletin
  • Schizophrenia Research
  • Current Opinion in Psychiatry
  • bioRxiv (Cold Spring Harbor Laboratory)
  • Psychological Medicine

The scientist's substantial output reveals a concentrated effort to understand disorders such as schizophrenia, their neurological underpinnings, and potential therapeutic approaches. Their interdisciplinary approach brings together clinical psychology, psychiatry, and neuroscience perspectives.

Best Publications

  • Monoclonal antibodies (O1 to O4) to oligodendrocyte cell surfaces: An immunocytological study in the central nervous system

    I. Sommer;M. Schachner

  • Treatment-Resistant Schizophrenia: Treatment Response and Resistance in Psychosis (TRRIP) Working Group Consensus Guidelines on Diagnosis and Terminology.

    Oliver D. Howes;Rob McCutcheon;Ofer Agid;Andrea De Bartolomeis

  • The genetic architecture of the human cerebral cortex

    Katrina L. Grasby;Neda Jahanshad;Jodie N. Painter;Lucía Colodro-Conde

  • Neural cell adhesion molecules and myelin-associated glycoprotein share a common carbohydrate moiety recognized by monoclonal antibodies L2 and HNK-1.

    J Kruse;R Mailhammer;H Wernecke;A Faissner

  • Preventive strategies for mental health

    Celso Arango;Covadonga M Díaz-Caneja;Patrick D McGorry;Judith Rapoport

  • Handedness, language lateralisation and anatomical asymmetry in schizophrenia: meta-analysis.

    Iris Sommer;Nick Ramsey;René Kahn;André Aleman

  • Should we expand the toolbox of psychiatric treatment methods to include Repetitive Transcranial Magnetic Stimulation (rTMS)? A meta-analysis of the efficacy of rTMS in psychiatric disorders.

    Christina W. Slotema;Jan Dirk Blom;Hans W. Hoek;Iris E. C. Sommer

  • The Relationship of DNA Methylation with Age, Gender and Genotype in Twins and Healthy Controls

    Marco P Boks;Eske M. Derks;Daniel J. Weisenberger;Erik Strengman

  • Exercise Improves Clinical Symptoms, Quality of Life, Global Functioning, and Depression in Schizophrenia: A Systematic Review and Meta-analysis

    Meenakshi Dauwan;Marieke J H Begemann;Sophie M Heringa;Iris E Sommer

  • Do women really have more bilateral language representation than men? A meta-analysis of functional imaging studies.

    Iris E. C. Sommer;André Aleman;Anke Bouma;René S. Kahn

  • Auditory verbal hallucinations in persons with and without a need for care

    Louise C. Johns;Kristiina Kompus;Melissa Connell;Clara Humpston

  • Efficacy of Anti-inflammatory Agents to Improve Symptoms in Patients With Schizophrenia: An Update

    Iris E. Sommer;Roos van Westrhenen;Marieke J. H. Begemann;Lot D. de Witte

  • Immune involvement in the pathogenesis of schizophrenia: a meta-analysis on postmortem brain studies.

    C. F. M. G. van Kesteren;H. Gremmels;L. D. de Witte;E. M. Hol;E. M. Hol;E. M. Hol

  • The Characteristic Features of Auditory Verbal Hallucinations in Clinical and Nonclinical Groups: State-of-the-Art Overview and Future Directions

    Frank Laroi;Iris E. Sommer;Jan Dirk Blom;Charles Fernyhough

  • The Same or Different? A Phenomenological Comparison of Auditory Verbal Hallucinations in Healthy and Psychotic Individuals

    Kirstin Daalman;Marco P. M. Boks;Kelly M. J. Diederen;Antoin D. de Weijer

  • Healthy Individuals With Auditory Verbal Hallucinations; Who Are They? Psychiatric Assessments of a Selected Sample of 103 Subjects

    Iris E C Sommer;Kirstin Daalman;Thomas Rietkerk;Kelly M Diederen

  • Auditory verbal hallucinations predominantly activate the right inferior frontal area

    Iris E. C. Sommer;Kelly M. J. Diederen;Jan-Dirk Blom;Anne Willems

  • Efficacy of slow repetitive transcranial magnetic stimulation in the treatment of resistant auditory hallucinations in schizophrenia: A meta-analysis

    Andre Aleman;Iris E. Sommer;Rene S. Kahn

  • Language lateralization in schizophrenia, an fMRI study.

    I.E.C. Sommer;N.F. Ramsey;R.S. Kahn

  • Sex differences in handedness, asymmetry of the Planum Temporale and functional language lateralization

    Iris E. Sommer;André Aleman;Metten Somers;Marco P. Boks

Frequent Co-Authors

René S. Kahn
René S. Kahn Icahn School of Medicine at Mount Sinai
André Aleman
André Aleman University Medical Center Groningen
Marco P. Boks
Marco P. Boks University of Amsterdam
René C.W. Mandl
René C.W. Mandl Utrecht University
Kenneth Hugdahl
Kenneth Hugdahl University of Bergen
Oliver Gruber
Oliver Gruber Heidelberg University
Roel A. Ophoff
Roel A. Ophoff University of California, Los Angeles
Paul M. Thompson
Paul M. Thompson University of Southern California
Sebastiaan F. W. Neggers
Sebastiaan F. W. Neggers Utrecht University
Celso Arango
Celso Arango Complutense University of Madrid

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