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D-Index & Metrics

Discipline name D-Index World Ranking National Ranking Publications Citations
Psychology 105 486 311 445 45594
Medicine 107 6201 3305 453 46352

Roland R. Griffiths publications per year

The chart shows the history of publications by Roland R. Griffiths between 1969 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Roland R. Griffiths published across 57 years, from 1969 to 2025, averaging 8.7 papers a year. Output peaked at 22 publications in 2022. 16 of the 496 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1969 to 2025. Vertical axis: number of publications, 0 to 22. Peak 22 publications in 2022. 1969: 1 publication 1970: 0 publications 1971: 1 publication 1972: 0 publications 1973: 4 publications 1974: 5 publications 1975: 6 publications 1976: 7 publications 1977: 5 publications 1978: 6 publications 1979: 5 publications 1980: 10 publications 1981: 14 publications 1982: 13 publications 1983: 13 publications 1984: 15 publications 1985: 10 publications 1986: 11 publications 1987: 15 publications 1988: 10 publications 1989: 16 publications 1990: 13 publications 1991: 13 publications 1992: 9 publications 1993: 17 publications 1994: 10 publications 1995: 11 publications 1996: 12 publications 1997: 8 publications 1998: 7 publications 1999: 11 publications 2000: 4 publications 2001: 10 publications 2002: 1 publication 2003: 9 publications 2004: 2 publications 2005: 11 publications 2006: 8 publications 2007: 4 publications 2008: 4 publications 2009: 6 publications 2010: 7 publications 2011: 8 publications 2012: 6 publications 2013: 12 publications 2014: 6 publications 2015: 14 publications 2016: 8 publications 2017: 13 publications 2018: 7 publications 2019: 5 publications 2020: 10 publications 2021: 13 publications 2022: 22 publications 2023: 12 publications 2024: 13 publications 2025: 3 publications
1969 2025

496 publications in total across all disciplines

View publications per year as a table
Roland R. Griffiths: publications per year, 1969 to 2025
Year Publications
1969 1
1970 0
1971 1
1972 0
1973 4
1974 5
1975 6
1976 7
1977 5
1978 6
1979 5
1980 10
1981 14
1982 13
1983 13
1984 15
1985 10
1986 11
1987 15
1988 10
1989 16
1990 13
1991 13
1992 9
1993 17
1994 10
1995 11
1996 12
1997 8
1998 7
1999 11
2000 4
2001 10
2002 1
2003 9
2004 2
2005 11
2006 8
2007 4
2008 4
2009 6
2010 7
2011 8
2012 6
2013 12
2014 6
2015 14
2016 8
2017 13
2018 7
2019 5
2020 10
2021 13
2022 22
2023 12
2024 13
2025 3
Total 496
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Roland R. Griffiths 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 Roland R. Griffiths 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, 441–450 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: 445 publications — 96th percentile

96% 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
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 32 445
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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Roland R. Griffiths 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 Roland R. Griffiths 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, 104–105 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: 105 D-Index — 96th percentile

96% 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
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 53 105
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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Research.com Recognitions

  • 1980 - Fellow of the American Psychological Association (APA)

Overview

Roland R. Griffiths was affiliated with Johns Hopkins University School of Medicine in the United States. Their research primarily focused on the intersection of psychology, neuroscience, and chemistry, with an emphasis on clinical psychology within these broader fields.

Their main fields of study included:

  • Psychology
  • Neuroscience
  • Chemistry

Within these fields, their subfields of study were:

  • Clinical Psychology
  • Organic Chemistry
  • Cellular and Molecular Neuroscience
  • Nutrition and Dietetics
  • Pharmacology

Griffiths' research topics covered areas such as:

  • Psychedelics and Drug Studies
  • Chemical synthesis and alkaloids
  • Neurotransmitter Receptor Influence on Behavior
  • Biochemical Analysis and Sensing Techniques
  • Complementary and Alternative Medicine Studies
  • Nicotinic Acetylcholine Receptors Study
  • Olfactory and Sensory Function Studies

The scientist frequently published in several venues, including:

  • JAMA Psychiatry
  • Journal of Psychopharmacology
  • Drug and Alcohol Dependence
  • Journal of Psychoactive Drugs
  • Psychedelic Medicine

Some of the recent papers authored or co-authored by Griffiths covered significant topics related to psilocybin-assisted therapy and its psychological effects. Notable publications include:

  • Effects of Psilocybin-Assisted Therapy on Major Depressive Disorder, 2020, JAMA Psychiatry
  • The Subjective Effects of Psychedelics Are Necessary for Their Enduring Therapeutic Effects, 2020, ACS Pharmacology & Translational Science
  • Single-Dose Psilocybin Treatment for Major Depressive Disorder, 2023, JAMA
  • Efficacy and safety of psilocybin-assisted treatment for major depressive disorder: Prospective 12-month follow-up, 2022, Journal of Psychopharmacology
  • Emotions and brain function are altered up to one month after a single high dose of psilocybin, 2020, Scientific Reports

Throughout their career, Griffiths frequently collaborated with other researchers. Their co-authors included:

  • Alan K. Davis
  • Frederick S. Barrett (21 papers)
  • Sandeep M. Nayak (18 papers)
  • Natalie Gukasyan (15 papers)
  • Nathan D. Sepeda (14 papers)

In 1980, Roland R. Griffiths was recognized as a Fellow of the American Psychological Association (APA).

Best Publications

  • Psilocybin produces substantial and sustained decreases in depression and anxiety in patients with life-threatening cancer: A randomized double-blind trial.

    Roland R Griffiths;Matthew W Johnson;Michael A Carducci;Annie Umbricht

  • Psilocybin can occasion mystical-type experiences having substantial and sustained personal meaning and spiritual significance.

    R. R. Griffiths;W. A. Richards;U. McCann;R. Jesse

  • Caffeinated energy drinks--a growing problem.

    Chad J. Reissig;Eric C. Strain;Roland R. Griffiths

  • Human hallucinogen research: guidelines for safety.

    Matthew W. Johnson;William A. Richards;Roland R. Griffiths

  • Effects of Psilocybin-Assisted Therapy on Major Depressive Disorder: A Randomized Clinical Trial

    Alan K. Davis;Alan K. Davis;Frederick S. Barrett;Darrick G. May;Mary P. Cosimano

  • Mystical-type experiences occasioned by psilocybin mediate the attribution of personal meaning and spiritual significance 14 months later

    Roland R. Griffiths;William A. Richards;Matthew W. Johnson;Una D. McCann

  • Pilot Study of the 5-HT2AR Agonist Psilocybin in the Treatment of Tobacco Addiction

    Matthew W Johnson;Albert Garcia-Romeu;Mary P Cosimano;Roland R Griffiths

  • Psilocybin occasioned mystical-type experiences: immediate and persisting dose-related effects

    Roland R. Griffiths;Matthew W. Johnson;William A. Richards;Brian D. Richards

  • Mystical experiences occasioned by the hallucinogen psilocybin lead to increases in the personality domain of openness

    Katherine A MacLean;Matthew W Johnson;Roland R Griffiths

  • A critical review of caffeine withdrawal: empirical validation of symptoms and signs, incidence, severity, and associated features.

    Laura M. Juliano;Roland R. Griffiths

  • Long-term Follow-Up of Psilocybin-Facilitated Smoking Cessation

    Matthew W. Johnson;Albert Garcia-Romeu;Roland R. Griffiths

  • Validation of the revised Mystical Experience Questionnaire in experimental sessions with psilocybin.

    Frederick S Barrett;Matthew W Johnson;Roland R Griffiths

  • Survey study of challenging experiences after ingesting psilocybin mushrooms: Acute and enduring positive and negative consequences.

    Theresa M Carbonaro;Matthew P Bradstreet;Frederick S Barrett;Katherine A MacLean

  • Withdrawal syndrome after the double-blind cessation of caffeine consumption.

    Kenneth Silverman;Suzette M. Evans;Suzette M. Evans;Eric C. Strain;Roland R. Griffiths

  • Psilocybin-Occasioned Mystical Experiences in the Treatment of Tobacco Addiction

    Albert Garcia-Romeu;Roland R. Griffiths;Matthew W. Johnson

  • Classic psychedelics: An integrative review of epidemiology, therapeutics, mystical experience, and brain network function.

    Matthew W. Johnson;Peter S. Hendricks;Frederick S. Barrett;Roland R. Griffiths

  • Psilocybin-occasioned mystical-type experience in combination with meditation and other spiritual practices produces enduring positive changes in psychological functioning and in trait measures of prosocial attitudes and behaviors

    Roland R Griffiths;Matthew W Johnson;William A Richards;Brian D Richards

  • Single-Dose Psilocybin Treatment for Major Depressive Disorder: A Randomized Clinical Trial.

    Unknown

  • An automated version of the digit symbol substitution test (DSST)

    Daniel R. McLeod;Roland R. Griffiths;George E. Bigelow;John Yingling

  • Caffeine physical dependence: a review of human and laboratory animal studies.

    Roland R. Griffiths;Phillip P. Woodson

  • Validation of the revised mystical experiences questionnaire in experimental sessions with psilocybin

    Frederick S. Barrett;Matthew W. Johnson;Roland R. Griffiths

Frequent Co-Authors

Matthew W. Johnson
Matthew W. Johnson Johns Hopkins University School of Medicine
George E. Bigelow
George E. Bigelow Johns Hopkins University School of Medicine
Kenneth Silverman
Kenneth Silverman Johns Hopkins University School of Medicine
Jack E. Henningfield
Jack E. Henningfield Johns Hopkins University School of Medicine
Maxine L. Stitzer
Maxine L. Stitzer Johns Hopkins University School of Medicine
Joseph V. Brady
Joseph V. Brady Johns Hopkins University School of Medicine
Scott E. Lukas
Scott E. Lukas Harvard Medical School
Craig R. Rush
Craig R. Rush University of Kentucky
Kenzie L. Preston
Kenzie L. Preston National Institute on Drug Abuse
Wolfgang Froestl
Wolfgang Froestl AC Immune (Switzerland)

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