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 107 451 394 292 249 350 42318

Greg Hajcak publications per year

The chart shows the history of publications by Greg Hajcak between 2002 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Greg Hajcak published across 24 years, from 2002 to 2025, averaging 16.2 papers a year. Output peaked at 34 publications in 2012. 35 of the 388 publications appeared in the last two years.

No. of publications
10 20 30
Bar chart. Horizontal axis: year, 2002 to 2025. Vertical axis: number of publications, 0 to 34. Peak 34 publications in 2012. 2002: 3 publications 2003: 2 publications 2004: 2 publications 2005: 6 publications 2006: 6 publications 2007: 7 publications 2008: 7 publications 2009: 15 publications 2010: 13 publications 2011: 17 publications 2012: 34 publications 2013: 21 publications 2014: 2 publications 2015: 16 publications 2016: 30 publications 2017: 29 publications 2018: 22 publications 2019: 26 publications 2020: 28 publications 2021: 33 publications 2022: 20 publications 2023: 14 publications 2024: 21 publications 2025: 14 publications
2002 2025

388 publications in total across all disciplines

View publications per year as a table
Greg Hajcak: publications per year, 2002 to 2025
Year Publications
2002 3
2003 2
2004 2
2005 6
2006 6
2007 7
2008 7
2009 15
2010 13
2011 17
2012 34
2013 21
2014 2
2015 16
2016 30
2017 29
2018 22
2019 26
2020 28
2021 33
2022 20
2023 14
2024 21
2025 14
Total 388
Download as CSV

Greg Hajcak 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 Greg Hajcak 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, 341–350 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: 350 publications — 91st percentile

91% 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 85 350
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
Download as CSV

Greg Hajcak 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 Greg Hajcak 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, 106–107 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: 107 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
106–107 46 107
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
Download as CSV

Overview

Greg Hajcak is a researcher affiliated with Santa Clara University in the United States. Their work primarily spans the fields of psychology and neuroscience, with a focus on subfields such as cognitive neuroscience, experimental and cognitive psychology, clinical psychology, psychiatry, and mental health. Across these areas, Hajcak has contributed significantly to the scientific understanding of neural and behavioral psychology, anxiety, depression, psychometrics, treatment, cognitive processes, child and adolescent psychosocial and emotional development, functional brain connectivity, mental health, heart rate variability, autonomic control, stress responses, and cortisol.

Hajcak's publication record includes research in notable venues such as Psychophysiology, Biological Psychology, International Journal of Psychophysiology, Biological Psychiatry Cognitive Neuroscience and Neuroimaging, and Psychological Medicine. These journals reflect a consistent engagement with psychophysiological and psychological methods and focus.

Their frequent coauthors include Christopher J. Brush, Nicholas J. Santopetro, Brady D. Nelson, Kreshnik Burani, and Julia Klawohn, indicating collaboration across multiple studies and projects within related domains.

Selected recent papers authored or coauthored by Greg Hajcak include:

  • "Increases in depression and anxiety symptoms in adolescents and young adults during the COVID-19 pandemic," 2021, Psychological Medicine
  • "Significance?... Significance! Empirical, methodological, and theoretical connections between the late positive potential and P300 as neural responses to stimulus significance: An integrative review," 2020, Psychophysiology
  • "Reduced neural response to reward and pleasant pictures independently relate to depression," 2020, Psychological Medicine
  • "Reduced P300 in depression: Evidence from a flanker task and impact on ERN, CRN, and Pe," 2020, Psychophysiology
  • "Data quality and reliability metrics for event-related potentials (ERPs): The utility of subject-level reliability," 2021, International Journal of Psychophysiology

Best Publications

  • The Obsessive-Compulsive Inventory: development and validation of a short version.

    Edna B. Foa;Jonathan D. Huppert;Susanne Leiberg;Robert Langner

  • Event-Related Potentials, Emotion, and Emotion Regulation: An Integrative Review

    Greg Hajcak;Annmarie MacNamara;Doreen M Olvet

  • The feedback-related negativity reflects the binary evaluation of good versus bad outcomes

    Greg Hajcak;Jason S. Moser;Clay B. Holroyd;Robert F. Simons

  • Reappraisal modulates the electrocortical response to unpleasant pictures

    Greg Hajcak;Sander Nieuwenhuis

  • To err is autonomic: error-related brain potentials, ANS activity, and post-error compensatory behavior.

    Greg Hajcak;Nicole McDonald;Robert F. Simons

  • On the ERN and the significance of errors.

    Greg Hajcak;Jason S. Moser;Nick Yeung;Robert F. Simons

  • Differentiating neural responses to emotional pictures: evidence from temporal-spatial PCA.

    Dan Foti;Greg Hajcak;Joseph Dien

  • The error-related negativity (ERN) and psychopathology: Toward an endophenotype

    Doreen M. Olvet;Greg Hajcak

  • Motivated and Controlled Attention to Emotion: Time-Course of the Late Positive Potential

    Greg Hajcak;Jonathan P. Dunning;Dan Foti

  • Brain potentials associated with expected and unexpected good and bad outcomes.

    Greg Hajcak;Clay B. Holroyd;Jason S. Moser;Robert F. Simons

  • It's worse than you thought: The feedback negativity and violations of reward prediction in gambling tasks

    Greg Hajcak;Jason S. Moser;Clay B. Holroyd;Robert F. Simons

  • Deconstructing reappraisal: Descriptions preceding arousing pictures modulate the subsequent neural response

    Dan Foti;Greg Hajcak

  • Anxiety and error-related brain activity

    Greg Hajcak;Nicole McDonald;Robert F. Simons

  • The Persistence of Attention to Emotion: Brain Potentials During and After Picture Presentation

    Greg Hajcak;Doreen M. Olvet

  • Error-related psychophysiology and negative affect ☆

    Greg Hajcak;Nicole McDonald;Robert F. Simons

  • Beyond good and evil: the time-course of neural activity elicited by specific picture content.

    Anna Weinberg;Greg Hajcak

  • The stability of error-related brain activity with increasing trials.

    Doreen M. Olvet;Greg Hajcak

  • Intentional modulation of emotional responding to unpleasant pictures: An ERP study

    Jason S. Moser;Greg Hajcak;Emily Bukay;Robert F. Simons

  • Ventral striatal and medial prefrontal BOLD activation is correlated with reward-related electrocortical activity: a combined ERP and fMRI study.

    Joshua M. Carlson;Dan Foti;Lilianne R. Mujica-Parodi;Eddie Harmon-Jones

  • The Obsessive-Complusive Inventory: Development and validation of a short version

    Edna B. Foa;Jonathan D. Huppert;Susanne Leiberg;Robert Langner

Frequent Co-Authors

Brady D. Nelson
Brady D. Nelson Stony Brook University
Dan Foti
Dan Foti Purdue University West Lafayette
Anna Weinberg
Anna Weinberg McGill University
Roman Kotov
Roman Kotov Stony Brook University
Daniel N. Klein
Daniel N. Klein Stony Brook University
Alexandria Meyer
Alexandria Meyer Santa Clara University
Autumn Kujawa
Autumn Kujawa Vanderbilt University
Robert F. Simons
Robert F. Simons University of Delaware
Annmarie MacNamara
Annmarie MacNamara Texas A&M University
K. Luan Phan
K. Luan Phan The Ohio State University

If you think any of the details on this page are incorrect, let us know.

Report an issue

We appreciate your kind effort to assist us to improve this page, it would be helpful providing us with as much detail as possible in the text box below:

Related Online Degrees & Career Pathways

Pursuing a psychology degree in the USA opens up a range of online degree options and diverse career pathways. Many students interested in mental health and guidance careers consider school counseling as a rewarding field. Becoming a school counselor typically requires a graduate-level degree in counseling or a related field, as well as the completion of supervised internships.

Each state has specific requirements. For example, read about the Mississippi school counselor education requirements to understand local credential standards. Similarly, those interested in working in Missouri should review the Missouri school counselor education requirements. Montana offers unique guidelines, so you can explore the Montana school counselor certification requirements. Nebraska also has its own set of standards, detailed in the requirements to be a school counselor in Nebraska.

Online psychology and counseling degrees can be a flexible way to meet educational requirements for these roles. No matter your location, researching your target state's certification process will help you plan your studies and career effectively.

Best Scientists Citing Greg Hajcak

Trending Scientists

Recently Published Articles