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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Psychology 33 10646 9967 5571 5086 79 3749

John O. Brooks publications per year

The chart shows the history of publications by John O. Brooks between 1990 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. John O. Brooks published across 36 years, from 1990 to 2025, averaging 2.5 papers a year. Output peaked at 10 publications in 2009. 4 of the 90 publications appeared in the last two years.

No. of publications
2 4 6 8 10
Bar chart. Horizontal axis: year, 1990 to 2025. Vertical axis: number of publications, 0 to 10. Peak 10 publications in 2009. 1990: 2 publications 1991: 4 publications 1992: 1 publication 1993: 9 publications 1994: 2 publications 1995: 3 publications 1996: 2 publications 1997: 1 publication 1998: 2 publications 1999: 4 publications 2000: 3 publications 2001: 1 publication 2002: 0 publications 2003: 1 publication 2004: 0 publications 2005: 2 publications 2006: 3 publications 2007: 2 publications 2008: 2 publications 2009: 10 publications 2010: 5 publications 2011: 5 publications 2012: 4 publications 2013: 1 publication 2014: 2 publications 2015: 2 publications 2016: 0 publications 2017: 0 publications 2018: 1 publication 2019: 1 publication 2020: 3 publications 2021: 6 publications 2022: 1 publication 2023: 1 publication 2024: 2 publications 2025: 2 publications
1990 2025

90 publications in total across all disciplines

View publications per year as a table
John O. Brooks: publications per year, 1990 to 2025
Year Publications
1990 2
1991 4
1992 1
1993 9
1994 2
1995 3
1996 2
1997 1
1998 2
1999 4
2000 3
2001 1
2002 0
2003 1
2004 0
2005 2
2006 3
2007 2
2008 2
2009 10
2010 5
2011 5
2012 4
2013 1
2014 2
2015 2
2016 0
2017 0
2018 1
2019 1
2020 3
2021 6
2022 1
2023 1
2024 2
2025 2
Total 90
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John O. Brooks publications per year - data summary

  • John O. Brooks, a Psychology scholar from University of California, Los Angeles, has 90 publications recorded across 36 years, from 1990 to 2025.
  • The oldest publication on record dates to 1990 and the most recent to 2025.
  • The most productive year is 2009, with 10 publications.
  • The least productive years with any output are 1992, 1997, 2001, 2003 and others, with 1 publication each.
  • 4 of the 36 years in the span carry no publications at all (2002, 2004, 2016 and 2017).
  • The rate of publication averages 2.5 papers per year over the whole span, or 2.8 per year counting only the 32 years with at least one publication.
  • The last 5 years on the chart (2021-2025) hold 12 publications, 13% of the career total.
  • Split into equal eras - 1990-2001: 34 publications (2.8 per year); 2002-2013: 35 publications (2.9 per year); 2014-2025: 21 publications (1.8 per year).
  • Comparing the opening and closing eras, the overall trend of publication is declining.

John O. Brooks 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 John O. Brooks 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, 71–80 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: 79 publications — 8th percentile

8% 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 79
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
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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John O. Brooks publication distribution in Psychology in 2026 - data summary

  • The chart plots the publication count of all 11,416 Psychology scientists ranked by Research.com in 2026, grouped into 69 ranges running from 31–40 to 705+ publications.
  • John O. Brooks, a Psychology scholar from University of California, Los Angeles, records 79 publications - the 8th percentile of the discipline.
  • 8% of ranked Psychology scientists score the same or lower than John O. Brooks, and about 92% score higher.
  • The median of the discipline falls in the 151–160 publications range, and John O. Brooks ranks below the median.
  • The most crowded range is 101–110 publications, holding 736 scientists (6% of the field).
  • 72% of the field sits in the lowest quarter of the value range (up to 201–210 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 705 publications or more, 100 scientists in all (<1% of the field).

John O. Brooks 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 John O. Brooks 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, 32–33 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: 33 D-Index — 10th percentile

10% 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 33
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
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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John O. Brooks D-index placement in Psychology in 2026 - data summary

  • The chart plots the discipline H-index (D-index) of all 11,416 Psychology scientists ranked by Research.com in 2026, grouped into 58 ranges running from 30–31 to 144+ D-Index.
  • John O. Brooks, a Psychology scholar from University of California, Los Angeles, records 33 D-Index - the 10th percentile of the discipline.
  • 10% of ranked Psychology scientists score the same or lower than John O. Brooks, and about 90% score higher.
  • The median of the discipline falls in the 48–49 D-Index range, and John O. Brooks ranks below the median.
  • The most crowded range is 32–33 D-Index, holding 702 scientists (6% of the field).
  • 68% of the field sits in the lowest quarter of the value range (up to 58–59 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 144 D-Index or more, 98 scientists in all (<1% of the field).

Overview

John O. Brooks is affiliated with the University of California, Los Angeles in the United States. Their research spans several interconnected fields, with a primary focus on medicine, neuroscience, and psychology.

The scientist's work often explores key subfields such as psychiatry and mental health, biological psychiatry, pharmacology, clinical psychology, and experimental and cognitive psychology. This multidisciplinary approach informs their investigations into complex mental health conditions and biological mechanisms.

Brooks's contributions include research on a variety of topics, including:

  • Tryptophan and brain disorders
  • Treatment of major depression
  • Electroconvulsive therapy studies
  • Stress responses and cortisol
  • Suicide and self-harm studies
  • Mental health research topics
  • Maternal mental health during pregnancy and postpartum

Their recent papers reflect a focus on depression, treatment responses, and suicide risk, often investigating sex-specific biological factors. Notable publications include:

  • "Inflammation and depression treatment response to electroconvulsive therapy: Sex-specific role of interleukin-8" (2020), Brain Behavior and Immunity
  • "Depression treatment response to ketamine: sex-specific role of interleukin-8, but not other inflammatory markers" (2021), Translational Psychiatry
  • "Machine Learning to Differentiate Risk of Suicide Attempt and Self-harm After General Medical Hospitalization of Women With Mental Illness" (2021), Medical Care
  • "Interleukin-8 and lower severity of depression in females, but not males, with treatment-resistant depression" (2021), Journal of Psychiatric Research
  • "Predicting suicidal behavior and self-harm after general hospitalization of adults with serious mental illness" (2020), Journal of Psychiatric Research

Frequent coauthors collaborating with Brooks include Jennifer L. Kruse, Katherine L. Narr, Gerhard Hellemann, Randall Espinoza, and Benjamin Wade. This network indicates a strong collaborative engagement across multiple studies, often within the domain of psychiatric and neurological research.

Brooks's work has frequently been published in reputable venues such as the Journal of Psychiatric Research, Brain Behavior and Immunity, Biological Psychiatry, Canadian Journal of Neurological Sciences / Journal Canadien des Sciences Neurologiques, and Translational Psychiatry.

Best Publications

  • Proposed Factor Structure of the Geriatric Depression Scale

    Javaid I. Sheikh;Jerome A. Yesavage;John O. Brooks;Leah Friedman

  • An actigraphic comparison of sleep restriction and sleep hygiene treatments for insomnia in older adults.

    Leah Friedman;Kathleen Benson;Art Noda;Vincent Zarcone

  • The relations among caregiver stress, "sundowning" symptoms, and cognitive decline in Alzheimer's disease.

    Dolores Gallagher‐Thompson;John O. Brooks;Donald Bliwise;Julie Leader

  • Insulin resistance and hippocampal volume in women at risk for Alzheimer's disease.

    Natalie L. Rasgon;Heather A. Kenna;Tonita E. Wroolie;Ryan Kelley

  • Advantages of excluding underpowered studies in meta-analysis: Inclusionist versus exclusionist viewpoints.

    Helena Chmura Kraemer;Christopher Gardner;John O. Brooks Iii;Jerome A. Yesavage

  • Depressive illness burden associated with complex polypharmacy in patients with bipolar disorder: findings from the STEP-BD.

    Joseph F. Goldberg;John O. Brooks;Keiko Kurita;Jennifer C. Hoblyn

  • Sleep Functioning in Relation to Mood, Function, and Quality of Life at Entry to the Systematic Treatment Enhancement Program for Bipolar Disorder (STEP-BD)

    June Gruber;Allison G. Harvey;Po W. Wang;John O. Brooks;John O. Brooks

  • Use of the wrist actigraph to study insomnia in older adults.

    John O. Brooks;Leah Friedman;Donald L. Bliwise;Jerome A. Yesavage;Jerome A. Yesavage

  • Decreased prefrontal, anterior cingulate, insula, and ventral striatal metabolism in medication-free depressed outpatients with bipolar disorder.

    John O. Brooks;John O. Brooks;Po W. Wang;Julie C. Bonner;Allyson C. Rosen

  • The methodology of studying decline in Alzheimer's disease.

    John O. Brooks;Helena Chmura Kraemer;Elizabeth Decker Tanke;Jerome A. Yesavage;Jerome A. Yesavage

  • Differences in regional brain metabolism associated with specific formulations of hormone therapy in postmenopausal women at risk for AD.

    Daniel H.S. Silverman;Cheri L. Geist;Heather A. Kenna;Katherine Williams

  • Acetyl L-Carnitine Slows Decline in Younger Patients With Alzheimer's Disease: A Reanalysis of a Double-Blind, Placebo-Controlled Study Using the Trilinear Approach

    John O. Brooks;Jerome A. Yesavage;Angelico Carta;Daniele Bravi

  • Mnemonic training in older adults: effects of age, length of training, and type of cognitive pretraining.

    John O. Brooks;Leah Friedman;Ann M. Pearman;Christine Gray

  • Neurocognitive Costs and Benefits of Psychotropic Medications in Older Adults

    John O. Brooks;Jennifer C. Hoblyn

  • PREDICTIVE SOCIOECONOMIC AND CLINICAL PROFILES OF ANTIDEPRESSANT RESPONSE AND REMISSION

    Felipe A. Jain;Aimee M. Hunter;John O. Brooks;Andrew F. Leuchter

  • Perceptions of life stress and chronic insomnia in older adults.

    Leah Friedman;John O. Brooks;Donald L. Bliwise;Jerome A. Yesavage

  • Long-term effects of mnemonic training in community-dwelling older adults.

    Ruth O’Hara;John O. Brooks;John O. Brooks;Leah Friedman;Carmen M. Schröder

  • Factor analysis and preliminary validation of the mini-mental state examination from a longitudinal perspective.

    Jared Tinklenberg;John O. Brooks;Elizabeth Decker Tanke;Kausar Khalid

  • Substance use disorders as risk factors for psychiatric hospitalization in bipolar disorder.

    Jennifer C. Hoblyn;Steve L. Balt;Stephanie A. Woodard;John O. Brooks

  • Selected psychiatric symptoms associated with rate of cognitive decline in patients with Alzheimer's disease.

    Terry P. Miller;Jared R. Tinklenberg;John O. Brooks;Howard H. Fenn

Frequent Co-Authors

Jerome A. Yesavage
Jerome A. Yesavage Stanford University
Leah Friedman
Leah Friedman Stanford University
Terence A. Ketter
Terence A. Ketter Stanford University
Katherine L. Narr
Katherine L. Narr University of California, Los Angeles
Gerhard Hellemann
Gerhard Hellemann University of California, Los Angeles
Helena C. Kraemer
Helena C. Kraemer Stanford University
Donald L. Bliwise
Donald L. Bliwise Emory University
Lori L. Altshuler
Lori L. Altshuler University of California, Los Angeles
Richard G. Olmstead
Richard G. Olmstead University of Washington
Javaid I. Sheikh
Javaid I. Sheikh Cornell University

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