World's Best Scientists 2026 revealed!

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Psychology 65 2874 2637 1655 1485 257 12582
Neuroscience 67 2889 2642 1341 1206 400 15868

Ozioma C. Okonkwo publications per year

The chart shows the history of publications by Ozioma C. Okonkwo between 2006 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Ozioma C. Okonkwo published across 20 years, from 2006 to 2025, averaging 22.4 papers a year. Output peaked at 49 publications in 2024. 84 of the 448 publications appeared in the last two years.

No. of publications
10 20 30 40
Bar chart. Horizontal axis: year, 2006 to 2025. Vertical axis: number of publications, 0 to 49. Peak 49 publications in 2024. 2006: 1 publication 2007: 6 publications 2008: 14 publications 2009: 7 publications 2010: 12 publications 2011: 2 publications 2012: 8 publications 2013: 14 publications 2014: 34 publications 2015: 31 publications 2016: 25 publications 2017: 22 publications 2018: 29 publications 2019: 26 publications 2020: 16 publications 2021: 46 publications 2022: 29 publications 2023: 42 publications 2024: 49 publications 2025: 35 publications
2006 2025

448 publications in total across all disciplines

View publications per year as a table
Ozioma C. Okonkwo: publications per year, 2006 to 2025
Year Publications
2006 1
2007 6
2008 14
2009 7
2010 12
2011 2
2012 8
2013 14
2014 34
2015 31
2016 25
2017 22
2018 29
2019 26
2020 16
2021 46
2022 29
2023 42
2024 49
2025 35
Total 448
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Ozioma C. Okonkwo publication distribution in Psychology in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Psychology in 2026. The highlighted bar marks where Ozioma C. Okonkwo sits on this spectrum.

No. of scientists
200 400 600
Bar chart with 69 bars. Horizontal axis: publications, 31–40 to 705+. Vertical axis: number of scientists, 0 to 736. Most scientists, 736, have 101–110 publications. The last bar groups every scientist with 705 publications or more. The highlighted bar, 251–260 publications, is where this scientist sits. 31–40 publications: 6 scientists 41–50 publications: 52 scientists 51–60 publications: 138 scientists 61–70 publications: 299 scientists 71–80 publications: 461 scientists 81–90 publications: 605 scientists 91–100 publications: 713 scientists 101–110 publications: 736 scientists 111–120 publications: 686 scientists 121–130 publications: 670 scientists 131–140 publications: 644 scientists 141–150 publications: 597 scientists 151–160 publications: 576 scientists 161–170 publications: 477 scientists 171–180 publications: 450 scientists 181–190 publications: 397 scientists 191–200 publications: 343 scientists 201–210 publications: 328 scientists 211–220 publications: 313 scientists 221–230 publications: 283 scientists 231–240 publications: 226 scientists 241–250 publications: 196 scientists 251–260 publications: 201 scientists 261–270 publications: 171 scientists 271–280 publications: 151 scientists 281–290 publications: 139 scientists 291–300 publications: 113 scientists 301–310 publications: 102 scientists 311–320 publications: 100 scientists 321–330 publications: 76 scientists 331–340 publications: 92 scientists 341–350 publications: 85 scientists 351–360 publications: 69 scientists 361–370 publications: 71 scientists 371–380 publications: 63 scientists 381–390 publications: 58 scientists 391–400 publications: 57 scientists 401–410 publications: 43 scientists 411–420 publications: 33 scientists 421–430 publications: 50 scientists 431–440 publications: 41 scientists 441–450 publications: 32 scientists 451–460 publications: 27 scientists 461–470 publications: 28 scientists 471–480 publications: 25 scientists 481–490 publications: 28 scientists 491–500 publications: 20 scientists 501–510 publications: 23 scientists 511–520 publications: 26 scientists 521–530 publications: 17 scientists 531–540 publications: 21 scientists 541–550 publications: 14 scientists 551–560 publications: 16 scientists 561–570 publications: 10 scientists 571–580 publications: 22 scientists 581–590 publications: 9 scientists 591–600 publications: 14 scientists 601–610 publications: 9 scientists 611–620 publications: 11 scientists 621–630 publications: 4 scientists 631–640 publications: 7 scientists 641–650 publications: 5 scientists 651–660 publications: 10 scientists 661–670 publications: 8 scientists 671–680 publications: 8 scientists 681–690 publications: 4 scientists 691–700 publications: 3 scientists 701–704 publications: 4 scientists 705+ publications: 100 scientists
31–40 publications 705+

This scientist: 257 publications — 82nd percentile

82% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 705 publications or more.

View publications distribution as a table
Number of Psychology scientists by publication count, Research.com 2026 ranking edition. Based on 11,416 ranked scientists.
Publications Scientists This scientist
31–40 6
41–50 52
51–60 138
61–70 299
71–80 461
81–90 605
91–100 713
101–110 736
111–120 686
121–130 670
131–140 644
141–150 597
151–160 576
161–170 477
171–180 450
181–190 397
191–200 343
201–210 328
211–220 313
221–230 283
231–240 226
241–250 196
251–260 201 257
261–270 171
271–280 151
281–290 139
291–300 113
301–310 102
311–320 100
321–330 76
331–340 92
341–350 85
351–360 69
361–370 71
371–380 63
381–390 58
391–400 57
401–410 43
411–420 33
421–430 50
431–440 41
441–450 32
451–460 27
461–470 28
471–480 25
481–490 28
491–500 20
501–510 23
511–520 26
521–530 17
531–540 21
541–550 14
551–560 16
561–570 10
571–580 22
581–590 9
591–600 14
601–610 9
611–620 11
621–630 4
631–640 7
641–650 5
651–660 10
661–670 8
671–680 8
681–690 4
691–700 3
701–704 4
705+ 100
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Ozioma C. Okonkwo D-index placement in Psychology in 2026

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

No. of scientists
200 400 600
Bar chart with 58 bars. Horizontal axis: D-Index, 30–31 to 144+. Vertical axis: number of scientists, 0 to 702. Most scientists, 702, have 32–33 D-Index. The last bar groups every scientist with 144 D-Index or more. The highlighted bar, 64–65 D-Index, is where this scientist sits. 30–31 D-Index: 398 scientists 32–33 D-Index: 702 scientists 34–35 D-Index: 671 scientists 36–37 D-Index: 659 scientists 38–39 D-Index: 641 scientists 40–41 D-Index: 671 scientists 42–43 D-Index: 617 scientists 44–45 D-Index: 558 scientists 46–47 D-Index: 495 scientists 48–49 D-Index: 487 scientists 50–51 D-Index: 445 scientists 52–53 D-Index: 390 scientists 54–55 D-Index: 408 scientists 56–57 D-Index: 345 scientists 58–59 D-Index: 325 scientists 60–61 D-Index: 321 scientists 62–63 D-Index: 248 scientists 64–65 D-Index: 290 scientists 66–67 D-Index: 218 scientists 68–69 D-Index: 219 scientists 70–71 D-Index: 215 scientists 72–73 D-Index: 183 scientists 74–75 D-Index: 169 scientists 76–77 D-Index: 132 scientists 78–79 D-Index: 137 scientists 80–81 D-Index: 120 scientists 82–83 D-Index: 112 scientists 84–85 D-Index: 86 scientists 86–87 D-Index: 101 scientists 88–89 D-Index: 83 scientists 90–91 D-Index: 77 scientists 92–93 D-Index: 70 scientists 94–95 D-Index: 78 scientists 96–97 D-Index: 58 scientists 98–99 D-Index: 53 scientists 100–101 D-Index: 57 scientists 102–103 D-Index: 48 scientists 104–105 D-Index: 53 scientists 106–107 D-Index: 46 scientists 108–109 D-Index: 24 scientists 110–111 D-Index: 35 scientists 112–113 D-Index: 27 scientists 114–115 D-Index: 32 scientists 116–117 D-Index: 31 scientists 118–119 D-Index: 22 scientists 120–121 D-Index: 16 scientists 122–123 D-Index: 24 scientists 124–125 D-Index: 18 scientists 126–127 D-Index: 11 scientists 128–129 D-Index: 19 scientists 130–131 D-Index: 10 scientists 132–133 D-Index: 16 scientists 134–135 D-Index: 10 scientists 136–137 D-Index: 12 scientists 138–139 D-Index: 8 scientists 140–141 D-Index: 5 scientists 142–143 D-Index: 12 scientists 144+ D-Index: 98 scientists
30–31 D-Index 144+

This scientist: 65 D-Index — 76th percentile

76% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 144 D-Index or more.

View D-Index distribution as a table
Number of Psychology scientists by D-index, Research.com 2026 ranking edition. Based on 11,416 ranked scientists.
D-Index Scientists This scientist
30–31 398
32–33 702
34–35 671
36–37 659
38–39 641
40–41 671
42–43 617
44–45 558
46–47 495
48–49 487
50–51 445
52–53 390
54–55 408
56–57 345
58–59 325
60–61 321
62–63 248
64–65 290 65
66–67 218
68–69 219
70–71 215
72–73 183
74–75 169
76–77 132
78–79 137
80–81 120
82–83 112
84–85 86
86–87 101
88–89 83
90–91 77
92–93 70
94–95 78
96–97 58
98–99 53
100–101 57
102–103 48
104–105 53
106–107 46
108–109 24
110–111 35
112–113 27
114–115 32
116–117 31
118–119 22
120–121 16
122–123 24
124–125 18
126–127 11
128–129 19
130–131 10
132–133 16
134–135 10
136–137 12
138–139 8
140–141 5
142–143 12
144+ 98
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Overview

Ozioma C. Okonkwo is affiliated with the University of Wisconsin-Madison in the United States, with a primary research focus in the field of Medicine. Their work spans several subfields including Psychiatry and Mental Health, Physiology, Neurology, Cognitive Neuroscience, and Cardiology and Cardiovascular Medicine.

Their research covers multiple main topics, such as:

  • Dementia and Cognitive Impairment Research
  • Alzheimer's disease research and treatments
  • Functional Brain Connectivity Studies
  • Health, Environment, Cognitive Aging
  • Frailty in Older Adults
  • Advanced Neuroimaging Techniques and Applications
  • Health disparities and outcomes

Ozioma C. Okonkwo has contributed to a variety of recent papers, including:

  • "Revised criteria for diagnosis and staging of Alzheimer's disease: Alzheimer's Association Workgroup," 2024, Alzheimer s & Dementia
  • "Using the Alzheimer's Disease Neuroimaging Initiative to improve early detection, diagnosis, and treatment of Alzheimer's disease," 2021, Alzheimer s & Dementia
  • "An examination of a novel multipanel of CSF biomarkers in the Alzheimer's disease clinical and pathological continuum," 2020, Alzheimer s & Dementia
  • "Association of Neighborhood-Level Disadvantage With Cerebral and Hippocampal Volume," 2020, JAMA Neurology
  • "Effects of Aerobic Exercise Training on Systemic Biomarkers and Cognition in Late Middle-Aged Adults at Risk for Alzheimer's Disease," 2021, Frontiers in Endocrinology

The scientist frequently publishes in venues such as:

  • Alzheimer s & Dementia
  • Alzheimer s & Dementia Diagnosis Assessment & Disease Monitoring
  • Journal of Alzheimer s Disease
  • JAMA Neurology
  • SLEEP

Collaborations are notable with frequent co-authors including:

  • Sterling C. Johnson
  • Barbara B. Bendlin
  • Sanjay Asthana
  • Cynthia M. Carlsson
  • Henrik Zetterberg

Best Publications

  • Whitepaper: Defining and investigating cognitive reserve, brain reserve, and brain maintenance

    Yaakov Stern;Eider M. Arenaza-Urquijo;David Bartrés-Faz;Sylvie Belleville

  • Association of Insulin Resistance With Cerebral Glucose Uptake in Late Middle–Aged Adults at Risk for Alzheimer Disease

    Auriel A. Willette;Barbara B. Bendlin;Erika J. Starks;Alex C. Birdsill

  • The Wisconsin Registry for Alzheimer's Prevention: A review of findings and current directions.

    Sterling C. Johnson;Rebecca L. Koscik;Erin M. Jonaitis;Lindsay R. Clark

  • Physical activity attenuates age-related biomarker alterations in preclinical AD

    Ozioma C. Okonkwo;Stephanie A. Schultz;Jennifer M. Oh;Jordan Larson

  • Amyloid burden is associated with self-reported sleep in nondemented late middle-aged adults

    Kate E. Sprecher;Barbara B. Bendlin;Annie M. Racine;Ozioma C. Okonkwo

  • Fornix integrity and hippocampal volume predict memory decline and progression to Alzheimer’s disease

    Michelle M. Mielke;Ozioma C. Okonkwo;Kenichi Oishi;Susumu Mori;Susumu Mori

  • Declining financial capacity in mild cognitive impairment: A 1-year longitudinal study

    K. L. Triebel;R. Martin;H. R. Griffith;J. Marceaux

  • Poor sleep is associated with CSF biomarkers of amyloid pathology in cognitively normal adults.

    Kate E. Sprecher;Rebecca L. Koscik;Cynthia M. Carlsson;Henrik Zetterberg

  • Amyloid burden and neural function in people at risk for Alzheimer's Disease

    Sterling C. Johnson;Bradley T. Christian;Ozioma C. Okonkwo;Jennifer M. Oh

  • Mild cognitive impairment and everyday function: evidence of reduced speed in performing instrumental activities of daily living.

    Virginia G. Wadley;Ozioma Okonkwo;Michael Crowe;Lesley A. Ross-Meadows;Lesley A. Ross-Meadows

  • Mild Cognitive Impairment and Everyday Function: An Investigation of Driving Performance

    Virginia G. Wadley;Ozioma Okonkwo;Michael Crowe;David E. Vance

  • Medical decision-making capacity in patients with mild cognitive impairment

    O. Okonkwo;H. R. Griffith;K. Belue;S. Lanza

  • Cognitive correlates of financial abilities in mild cognitive impairment.

    Ozioma C. Okonkwo;Virginia G. Wadley;H. Randall Griffith;Karlene Ball

  • Using the Alzheimer's Disease Neuroimaging Initiative to improve early detection, diagnosis, and treatment of Alzheimer's disease.

    Dallas P. Veitch;Michael W. Weiner;Paul S. Aisen;Laurel A. Beckett

  • Low cerebral blood flow is associated with lower memory function in metabolic syndrome.

    Alex C. Birdsill;Cynthia M. Carlsson;Auriel A. Willette;Ozioma C. Okonkwo

  • Life-Space and Cognitive Decline in a Community-Based Sample of African American and Caucasian Older Adults

    Michael Crowe;Ross Andel;Virginia G. Wadley;Ozioma C. Okonkwo

  • Occupational Complexity and Cognitive Reserve in a Middle-Aged Cohort at Risk for Alzheimer's Disease

    Elizabeth A. Boots;Stephanie A. Schultz;Rodrigo P. Almeida;Jennifer M. Oh

  • Associations between white matter microstructure and amyloid burden in preclinical Alzheimer's disease: A multimodal imaging investigation

    Annie M. Racine;Nagesh Adluru;Andrew L. Alexander;Bradley T. Christian

  • Pathway-Specific Polygenic Risk Scores as Predictors of Amyloid-β Deposition and Cognitive Function in a Sample at Increased Risk for Alzheimer's Disease.

    Burcu F Darst;Rebecca L Koscik;Annie M Racine;Jennifer M Oh

  • Regional white matter hyperintensities: aging, Alzheimer's disease risk, and cognitive function

    Alex C. Birdsill;Rebecca L. Koscik;Erin M. Jonaitis;Sterling C. Johnson

  • Association of Neighborhood-Level Disadvantage With Cerebral and Hippocampal Volume.

    Jack F V Hunt;William Buckingham;Alice J Kim;Jennifer Oh

  • Medical decision-making capacity in mild cognitive impairment: A 3-year longitudinal study

    O. C. Okonkwo;H. R. Griffith;J. N. Copeland;K. Belue

  • Awareness of deficits in financial abilities in patients with mild cognitive impairment: going beyond self-informant discrepancy.

    Ozioma C. Okonkwo;Virginia G. Wadley;H Randall Griffith;Katherine Belue

Frequent Co-Authors

Sterling C. Johnson
Sterling C. Johnson University of Wisconsin–Madison
Sanjay Asthana
Sanjay Asthana University of Wisconsin–Madison
Mark A. Sager
Mark A. Sager University of Wisconsin–Madison
Rebecca L. Koscik
Rebecca L. Koscik University of Wisconsin–Madison
Henrik Zetterberg
Henrik Zetterberg University of Gothenburg
Bruce P. Hermann
Bruce P. Hermann University of Wisconsin–Madison
Kaj Blennow
Kaj Blennow University of Gothenburg
Andrew L. Alexander
Andrew L. Alexander University of Wisconsin–Madison
Bradley T. Christian
Bradley T. Christian University of Wisconsin–Madison
Daniel C. Marson
Daniel C. Marson University of Alabama at Birmingham

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