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    1. Verbal Fluency TestGradeA
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    16,361Registered studies name a cognitive test in an outcome measure11,688 name a test you can run hereExplore the studies
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  1. Home
  2. /Data
  3. /Clinical trials
  4. /Conditions
  5. /Schizophrenia and psychosis

Clinical trials data

Cognitive tests in schizophrenia and psychosis trials: 640 registered studies

Every registered schizophrenia and psychosis study on ClinicalTrials.gov that names a cognitive test in an outcome measure: the tests used most, how often as a primary outcome, which tests go together, how large the studies are and when they measure the outcome.

Registered schizophrenia and psychosis studies name a cognitive test in an outcome
640
Name one in a primary outcome
273
See the tests
Median participants per study
60
By phase
Led by industry
65

The tests schizophrenia and psychosis trials use most

Verbal Learning leads: 112 of the 640 studies name it, 18%. Next comes Verbal Fluency (107). As a primary outcome, Verbal Learning leads with 37 studies.

  1. 1

    Verbal Learning112 studies, 37 as a primary outcome

  2. 2

    Verbal Fluency107 studies, 34 as a primary outcome

  3. 3

    Trail Making Test102 studies, 18 as a primary outcome

  4. 4

    Continuous Performance Test78 studies, 28 as a primary outcome

  5. 5

    N-Back Task66 studies, 32 as a primary outcome

  6. 6

    Digit Span Test66 studies, 15 as a primary outcome

  7. 7

    Emoji Emotion Recognition52 studies, 16 as a primary outcome

  8. 8

    Card Sorting Test (Berg)50 studies, 15 as a primary outcome

  9. 9

    Category Fluency46 studies, 13 as a primary outcome

  10. 10

    Stroop Color-Word Test46 studies, 9 as a primary outcome

  11. 11

    Symbol Coding43 studies, 9 as a primary outcome

  12. 12

    Tower Planning40 studies, 12 as a primary outcome

  13. 13

    AX Continuous Performance Test32 studies, 20 as a primary outcome

  14. 14

    Letter-Number Sequencing Task29 studies, 8 as a primary outcome

  15. 15

    Indirect Hints Task27 studies, 6 as a primary outcome

  16. 16

    Matrix Reasoning21 studies, 6 as a primary outcome

  17. 17

    Oddball Target Detection20 studies, 8 as a primary outcome

  18. 18

    Short Story Recall19 studies, 3 as a primary outcome

  19. 19

    Go/No-Go Task15 studies, 3 as a primary outcome

  20. 20

    Task Switching Test14 studies, 1 as a primary outcome

  21. 21

    Monetary Incentive Delay13 studies, 7 as a primary outcome

  22. 22

    Rapid Visual Information Processing13 studies, 4 as a primary outcome

  23. 23

    Paced Visual Serial Addition Test13 studies, 3 as a primary outcome

  24. 24

    Beads Task12 studies, 4 as a primary outcome

  25. 25

    Finger Tapping Task12 studies, 2 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

13% of schizophrenia and psychosis studies name only instruments outside the library, such as clinician-administered screening scales. They count in every figure on this page and are not listed. The explorer below holds all 114 tests.

Tests used together

The pairs of tests schizophrenia and psychosis studies name together most often.
  1. Trail Making Test and Verbal Learning43 studies name both
  2. Trail Making Test and Verbal Fluency30 studies name both
  3. Continuous Performance Test and Verbal Learning28 studies name both
  4. Category Fluency and Continuous Performance Test27 studies name both
  5. Digit Span Test and Trail Making Test27 studies name both
  6. AX Continuous Performance Test and Continuous Performance Test24 studies name both
  7. Verbal Fluency and Verbal Learning24 studies name both
  8. Category Fluency and Verbal Learning23 studies name both
  9. Digit Span Test and Verbal Learning23 studies name both
  10. Category Fluency and Trail Making Test21 studies name both

Studies by start year

Each study counted once. 2026 is partly planned starts.
02000: 1 studies, 1 with a test as a primary outcome20002001: 1 studies, 0 with a test as a primary outcome2002: 8 studies, 8 with a test as a primary outcome2003: 9 studies, 6 with a test as a primary outcome2004: 10 studies, 4 with a test as a primary outcome2005: 10 studies, 5 with a test as a primary outcome20052006: 9 studies, 4 with a test as a primary outcome2007: 18 studies, 10 with a test as a primary outcome2008: 10 studies, 3 with a test as a primary outcome2009: 13 studies, 8 with a test as a primary outcome2010: 17 studies, 10 with a test as a primary outcome20102011: 19 studies, 4 with a test as a primary outcome2012: 23 studies, 10 with a test as a primary outcome2013: 29 studies, 14 with a test as a primary outcome2014: 33 studies, 14 with a test as a primary outcome2015: 28 studies, 13 with a test as a primary outcome20152016: 38 studies, 19 with a test as a primary outcome2017: 26 studies, 10 with a test as a primary outcome2018: 34 studies, 10 with a test as a primary outcome2019: 44 studies, 20 with a test as a primary outcome2020: 23 studies, 12 with a test as a primary outcome20202021: 36 studies, 18 with a test as a primary outcome2022: 34 studies, 12 with a test as a primary outcome2023: 35 studies, 13 with a test as a primary outcome2024: 35 studies, 10 with a test as a primary outcome2025: 42 studies, 15 with a test as a primary outcome20252026: 48 studies, 18 with a test as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

Show as a table
Registered studies by start year
Start yearStudiesA test as a primary outcome
200011
200110
200288
200396
2004104
2005105
200694
20071810
2008103
2009138
20101710
2011194
20122310
20132914
20143314
20152813
20163819
20172610
20183410
20194420
20202312
20213618
20223412
20233513
20243510
20254215
20264818

Phases and sponsors

By phase

  • Early phase 112 studies, 7 as a primary outcome
  • Phase 130 studies, 19 as a primary outcome
  • Phase 1/29 studies, 2 as a primary outcome
  • Phase 284 studies, 34 as a primary outcome
  • Phase 2/311 studies, 2 as a primary outcome
  • Phase 333 studies, 9 as a primary outcome
  • Phase 452 studies, 24 as a primary outcome
  • Not applicable366 studies, 156 as a primary outcome
  • Observational43 studies, 20 as a primary outcome

Sponsors and study types

Lead sponsor: industry 65, NIH 2, universities, hospitals and others 573. Interventional 597, observational 43.

Status, results, interventions and countries

Status

  • Recruiting108 studies, 35 as a primary outcome
  • Not yet recruiting30 studies, 14 as a primary outcome
  • Active, not recruiting22 studies, 9 as a primary outcome
  • Completed350 studies, 166 as a primary outcome
  • Stopped early50 studies, 15 as a primary outcome
  • Status unknown80 studies, 34 as a primary outcome

What they test

  • Behavioral179 studies, 86 as a primary outcome
  • Drug248 studies, 109 as a primary outcome
  • Device132 studies, 47 as a primary outcome
  • Dietary supplement17 studies, 6 as a primary outcome
  • Procedure10 studies, 2 as a primary outcome
  • Diagnostic test5 studies, 2 as a primary outcome
  • Biological3 studies, 0 as a primary outcome
  • Combination product1 studies, 0 as a primary outcome
  • Genetic1 studies, 1 as a primary outcome
  • Other121 studies, 49 as a primary outcome
  • None given21 studies, 11 as a primary outcome

Intervention types as registered. A study can list several; observational studies often list none.

Where their sites are

  • United States253 studies, 139 as a primary outcome
  • France50 studies, 15 as a primary outcome
  • Canada45 studies, 15 as a primary outcome
  • Taiwan44 studies, 18 as a primary outcome
  • China40 studies, 6 as a primary outcome
  • Germany34 studies, 7 as a primary outcome
  • Spain34 studies, 13 as a primary outcome
  • United Kingdom28 studies, 10 as a primary outcome
  • Italy15 studies, 3 as a primary outcome
  • Denmark14 studies, 1 as a primary outcome
  • South Korea14 studies, 3 as a primary outcome
  • India13 studies, 3 as a primary outcome

57 countries in all. A study with sites in several counts in each; 43 list no site.

Reported results

Completed studies with results posted on ClinicalTrials.gov, a results paper the registry links to the study, or both.

Completed schizophrenia and psychosis studies: 196 of 350, 56%

Every completed study with a cognitive outcome: 3,626 of 7,953, 46%

Completed schizophrenia and psychosis studies and every completed study, by how they reported results
ResultsCompleted schizophrenia and psychosis studiesEvery completed study
Results on ClinicalTrials.gov and a paper51, 15%776, 10%
Results on ClinicalTrials.gov only77, 22%1,139, 14%
A results paper only68, 19%1,711, 22%
Neither154, 44%4,327, 54%

How many participants they enroll

Enrollment as registered: actual for a finished study, planned for one still recruiting.
102050100200500
  • Early phase 146 median, 18 to 98
  • Phase 131 median, 21 to 77
  • Phase 257 median, 31 to 92
  • Phase 3142 median, 49 to 400
  • Phase 460 median, 40 to 98
  • Not applicable60 median, 32 to 108
  • Observational100 median, 62 to 289
Participants per study. The bar spans the middle half of the studies in each phase, the mark is the median, and the axis is logarithmic. Phases with fewer than 10 studies that give a size are left out.
Show as a table
Participants per schizophrenia and psychosis study by phase
PhaseStudies with a sizeMedianMiddle half
Early phase 1124618 to 98
Phase 1293121 to 77
Phase 2825731 to 92
Phase 33314249 to 400
Phase 4516040 to 98
Not applicable3626032 to 108
Observational4310062 to 289

When the cognitive outcome is measured

Half of the primary outcomes that name a library test are measured within 8 weeks of the start, and the middle half from 1 week to 13 weeks. 400 primary outcomes give a duration.

Latest time point of each outcome

  • Within a day184 outcomes, 85 as a primary outcome
  • Up to 4 weeks256 outcomes, 84 as a primary outcome
  • 1 to 3 months390 outcomes, 134 as a primary outcome
  • 3 to 6 months246 outcomes, 71 as a primary outcome
  • 6 to 12 months101 outcomes, 12 as a primary outcome
  • 1 to 2 years47 outcomes, 9 as a primary outcome
  • Over 2 years22 outcomes, 5 as a primary outcome
  • No duration given59 outcomes, 22 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

1,246 of the 1,305 outcome measures give a duration. A single visit counts as within a day.

Median time to the primary outcome, by test

Median weeks to the latest time point of each test's primary outcomes
TestPrimary outcomesMedian
Verbal Learning358 weeks
Verbal Fluency339 weeks
N-Back Task304 weeks
Continuous Performance Test2810 weeks
AX Continuous Performance Test183 weeks
Trail Making Test178 weeks
Emoji Emotion Recognition1611 weeks
Digit Span Test1510 weeks
Card Sorting Test (Berg)1312 weeks
Category Fluency1210 weeks

Explore the schizophrenia and psychosis studies

The 558 schizophrenia and psychosis studies that name a test in the library, with filters for test, phase, sponsor, status, country, intervention, outcome list, size and start year. Each study links to its record on ClinicalTrials.gov.
ConditionSchizophrenia and psychosis

558 studies match. 242 name a library test in a primary outcome. Median size 60 participants. Median time to the primary outcome: 8 weeks.

Loading 558 studies; the filters turn on when they arrive.

By start year
02040602000: 1 studies, 1 naming a library test in a primary outcome20002001: 1 studies, 0 naming a library test in a primary outcome2002: 8 studies, 8 naming a library test in a primary outcome2003: 8 studies, 5 naming a library test in a primary outcome2004: 8 studies, 4 naming a library test in a primary outcome2005: 10 studies, 5 naming a library test in a primary outcome20052006: 9 studies, 4 naming a library test in a primary outcome2007: 18 studies, 10 naming a library test in a primary outcome2008: 10 studies, 3 naming a library test in a primary outcome2009: 13 studies, 8 naming a library test in a primary outcome2010: 16 studies, 10 naming a library test in a primary outcome20102011: 17 studies, 4 naming a library test in a primary outcome2012: 21 studies, 10 naming a library test in a primary outcome2013: 26 studies, 13 naming a library test in a primary outcome2014: 31 studies, 14 naming a library test in a primary outcome2015: 24 studies, 12 naming a library test in a primary outcome20152016: 32 studies, 17 naming a library test in a primary outcome2017: 23 studies, 10 naming a library test in a primary outcome2018: 31 studies, 8 naming a library test in a primary outcome2019: 39 studies, 17 naming a library test in a primary outcome2020: 19 studies, 9 naming a library test in a primary outcome20202021: 32 studies, 15 naming a library test in a primary outcome2022: 29 studies, 10 naming a library test in a primary outcome2023: 24 studies, 8 naming a library test in a primary outcome2024: 28 studies, 7 naming a library test in a primary outcome2025: 29 studies, 11 naming a library test in a primary outcome20252026: 45 studies, 17 naming a library test in a primary outcome

2026 is partly planned starts. Not shown: 1 that started before 2000, 4 planned to start after 2026 and 1 with no start year.

Show as a table
Matching studies by start year
Start yearStudiesAs a primary outcome
200011
200110
200288
200385
200484
2005105
200694
20071810
2008103
2009138
20101610
2011174
20122110
20132613
20143114
20152412
20163217
20172310
2018318
20193917
2020199
20213215
20222910
2023248
2024287
20252911
20264517

Library tests named most

Largest condition groups

  • Schizophrenia and psychosis558 studies, 242 as a primary outcome
  • Depression and bipolar disorder51 studies, 24 as a primary outcome
  • Substance use and addiction33 studies, 13 as a primary outcome
  • Anxiety, PTSD and OCD15 studies, 4 as a primary outcome
  • Healthy volunteers14 studies, 8 as a primary outcome
  • Aging, frailty and exercise9 studies, 5 as a primary outcome
  • Dementia and Alzheimer's6 studies, 3 as a primary outcome
  • Parkinson's disease5 studies, 2 as a primary outcome
  • Obesity and diabetes5 studies, 2 as a primary outcome
  • Sleep and sleep disorders5 studies, 1 as a primary outcome
  • Autism3 studies, 1 as a primary outcome
  • Delirium, surgery and intensive care2 studies, 1 as a primary outcome

Phases

Participants

Lead sponsor: industry 61, NIH 2, other 495. Interventional 523, observational 35.

As a primary outcomeSecondary or other outcome

The studies, newest registration first

Each number opens the study's record on ClinicalTrials.gov.

Registered studies that match the filters, newest registration first, with the library tests each one names and the outcome list that names them.
StudyStartPhaseConditionsParticipantsLead sponsorStatusLibrary tests named, with the latest time point
NCT07900893Start2026PhaseNot applicableConditionsSchizophrenia and psychosis, Healthy volunteersParticipants10,000Lead sponsorOtherStatusRecruitingLibrary tests named
  • Probabilistic Reversal LearningPrimarysame day
  • Trust GamePrimarysame day
  • Cue Blocking TaskPrimarysame day
NCT07881016Start2026PhaseNot applicableConditionsSchizophrenia and psychosis, Depression and bipolar disorder, AutismParticipants3,000Lead sponsorOtherStatusRecruitingLibrary tests named
  • Intra/Extra Dimensional Set ShiftSecondary
NCT07875790Start2028PhaseNot applicableConditionsSchizophrenia and psychosis, Healthy volunteersParticipants325Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Probabilistic Reversal LearningPrimarysame day
  • Trust GamePrimarysame day
  • Cue Blocking TaskPrimarysame day
NCT07856381Start2026PhaseObservationalConditionsSchizophrenia and psychosis, Healthy volunteersParticipants180Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal FluencySecondary2 years
  • Emoji Emotion RecognitionPrimary2 years
NCT07856368Start2026PhaseNot applicableConditionsSchizophrenia and psychosisParticipants40Lead sponsorOtherStatusRecruitingLibrary tests named
  • Oddball Target DetectionSecondary5 days
NCT07853807Start2026PhaseNot applicableConditionsSchizophrenia and psychosis, Healthy volunteersParticipants325Lead sponsorOtherStatusRecruitingLibrary tests named
  • Probabilistic Reversal LearningPrimarysame day
  • Trust GamePrimarysame day
  • Cue Blocking TaskPrimarysame day
NCT07853079Start2026PhaseNot applicableConditionsSchizophrenia and psychosisParticipants88Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Verbal FluencySecondary8 weeks
  • Monetary Incentive DelaySecondary8 weeks
NCT07834203Start2025PhaseObservationalConditionsSchizophrenia and psychosis, Depression and bipolar disorderParticipants500Lead sponsorOtherStatusRecruitingLibrary tests named
  • Continuous Performance TestWording unclear
  • Matrix ReasoningSecondary8 weeks
  • AX Continuous Performance TestPrimary8 weeks
  • Word Pair LearningSecondary8 weeks
  • Four-Armed BanditPrimary8 weeks
NCT07806877Start2026PhaseNot applicableConditionsSchizophrenia and psychosisParticipants60Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestPrimary6 weeks
  • N-Back TaskSecondary6 weeks
  • Card Sorting Test (Berg)Primary6 weeks
  • Paced Visual Serial Addition TestPrimary6 weeks
  • Oddball Target DetectionSecondary6 weeks
NCT07805980Start2026PhaseNot applicableConditionsSchizophrenia and psychosisParticipants30Lead sponsorOtherStatusRecruitingLibrary tests named
  • Cue Reactivity TaskSecondary1 week
NCT07795554Start2026PhaseNot applicableConditionsSchizophrenia and psychosisParticipants60Lead sponsorOtherStatusRecruitingLibrary tests named
  • Go/No-Go TaskSecondary6 weeks
  • Stop-Signal TaskSecondary6 weeks
  • Cue Reactivity TaskSecondary
NCT07786714Start2026PhaseNot applicableConditionsSchizophrenia and psychosisParticipants40Lead sponsorOtherStatusRecruitingLibrary tests named
  • Beads TaskSecondary13 weeks
  • Light and Tone TaskSecondary13 weeks
NCT07748078Start2026PhaseNot applicableConditionsSchizophrenia and psychosis, Substance use and addictionParticipants140Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Verbal FluencyPrimary12 weeks
NCT07747181Start2026PhaseNot applicableConditionsSchizophrenia and psychosisParticipants135Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary13 weeks
  • Verbal FluencyPrimary13 weeks
  • Digit Span TestSecondary13 weeks
  • Symbol CodingSecondary13 weeks
  • Short Story RecallSecondary13 weeks
  • Cancellation TestSecondary13 weeks
  • Delayed Recall ModuleSecondary13 weeks
NCT07745140Start2026PhaseNot applicableConditionsSchizophrenia and psychosisParticipants66Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Verbal FluencySecondary6 weeks
  • Digit Span TestSecondary6 weeks
  • Rapid Visual Information ProcessingSecondary6 weeks
NCT07743645Start2026PhaseNot applicableConditionsSchizophrenia and psychosisParticipants100Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningSecondary12 months
  • Size Order Memory TestSecondary12 months
  • Pattern and Letter ComparisonSecondary12 months
NCT07702526Start2026PhaseNot applicableConditionsSchizophrenia and psychosisParticipants160Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestPrimary4 weeks
  • Verbal LearningPrimary4 weeks
  • Continuous Performance TestPrimary4 weeks
  • Category FluencyPrimary4 weeks
  • Antisaccade TaskPrimary4 weeks
NCT07701343Start2026PhaseNot applicableConditionsSchizophrenia and psychosisParticipants30Lead sponsorOtherStatusRecruitingLibrary tests named
  • Oddball Target DetectionSecondarysame day
  • Sternberg Memory ScanningPrimary1 week
NCT07680959Start2024PhaseNot applicableConditionsSchizophrenia and psychosisParticipants100Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary3 weeks
  • Stroop Color-Word TestSecondary3 weeks
  • Verbal FluencySecondary3 weeks
  • Tower PlanningSecondary3 weeks
NCT07659938Start2027PhaseNot applicableConditionsSchizophrenia and psychosisParticipants30Lead sponsorIndustryStatusNot yet recruitingLibrary tests named
  • N-Back TaskPrimary12 weeks
NCT07658898Start2026PhaseNot applicableConditionsSchizophrenia and psychosisParticipants74Lead sponsorOtherStatusRecruitingLibrary tests named
  • Stroop Color-Word TestSecondary4 weeks
  • Verbal FluencySecondary4 weeks
  • Go/No-Go TaskSecondary4 weeks
  • Tower PlanningSecondary4 weeks
NCT07647380Start2026PhaseNot applicableConditionsSchizophrenia and psychosisParticipants50Lead sponsorOtherStatusRecruitingLibrary tests named
  • Oddball Target DetectionSecondary4 weeks
  • Mnemonic Similarity TaskSecondary4 weeks
  • Sternberg Memory ScanningSecondary4 weeks
NCT07633899Start2022PhaseNot applicableConditionsSchizophrenia and psychosisParticipants32Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestSecondarysame day
  • Stroop Color-Word TestSecondarysame day
  • Digit Span TestSecondarysame day
  • Cancellation TestSecondarysame day
NCT07621549Start2025PhaseNot applicableConditionsSchizophrenia and psychosisParticipants80Lead sponsorOtherStatusRecruitingLibrary tests named
  • Tower PlanningSecondary13 weeks
  • Paired Associate LearningSecondary13 weeks
  • Rapid Visual Information ProcessingSecondary13 weeks
  • Emoji Emotion RecognitionSecondary13 weeks
  • One-Touch Tower PlanningSecondary13 weeks
NCT07616999Start2026PhaseObservationalConditionsSchizophrenia and psychosisParticipants178Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal FluencySecondary
  • Grid Pattern Span TaskSecondary

Page 1 of 23

Questions, answered from the data

Which cognitive test do schizophrenia and psychosis trials use most?

Verbal Learning: 112 of the 640 registered studies name it in an outcome measure, 18%. Next come Verbal Fluency (107) and the Trail Making Test (102).

Which cognitive test do schizophrenia and psychosis trials use most as a primary outcome?

Verbal Learning, named in a primary outcome by 37 studies. 273 of the 640 studies, 43%, name a cognitive test in a primary outcome.

How many participants does a phase 2 schizophrenia and psychosis trial enroll?

Half of the phase 2 schizophrenia and psychosis studies enroll 57 participants or fewer, and the middle half enroll 31 to 92. 82 of them give a size.

How long after the start do schizophrenia and psychosis trials measure a cognitive outcome?

Half of the primary outcomes that name a library test are measured within 8 weeks of the start, and the middle half from 1 week to 13 weeks. 400 primary outcomes give a duration.

Which cognitive tests do schizophrenia and psychosis trials use together?

The Trail Making Test with Verbal Learning most often: 43 studies name both. Next, the Trail Making Test with Verbal Fluency (30).

How many completed schizophrenia and psychosis trials have reported results?

196 of the 350 completed schizophrenia and psychosis studies, 56%, have reported results: 128 posted them on ClinicalTrials.gov, 119 have a results paper linked to the registry record, and 51 did both. The other 154 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

Other conditions

  • Depression and bipolar disorder69 shared
  • Substance use and addiction36 shared
  • Anxiety, PTSD and OCD22 shared
  • Dementia and Alzheimer's15 shared
  • Healthy volunteers14 shared
  • Aging, frailty and exercise11 shared
  • Parkinson's disease7 shared
  • Sleep and sleep disorders5 shared
  • Obesity and diabetes5 shared
  • Autism5 shared
  • Delirium, surgery and intensive care3 shared
  • Cardiovascular disease2 shared
  • Pain and fatigue2 shared
  • Stroke1 shared
  • Brain injury and concussion1 shared
  • ADHD1 shared
  • Hearing loss1 shared
  • Epilepsy1 shared
  • Mild cognitive impairment859 studies
  • Cancer760 studies
  • Multiple sclerosis612 studies
  • Cognitive impairment and decline354 studies
  • COVID-19 and long COVID221 studies
  • Lung disease110 studies

All 16,361 registered studies, by test, condition, phase and year.

How the studies are counted

For each test family, the census runs ClinicalTrials.gov's own outcome search for the family's names and reads every study first posted by the day the family was counted. These studies were read on 10 November 2026. A study counts once on a page, however many tests it names. Counts for a test cover every version of the task under any of its names, so a page can count studies that used a commercial version.

The census adds two things to each record and changes nothing in it: which outcome list names the test (primary, then secondary, then other), and the condition groups, matched on the study's condition names and MeSH terms. A study can fall in several groups; one whose only condition is cognitive impairment or decline falls in “Cognitive impairment and decline”. Studies that name only instruments outside the library count in every total and share but are not listed.

A second read on 10 November 2026 added each study's overall status, whether results are posted, its intervention types, the countries of its sites and the time frame of the outcome that names each test. A time frame counts by the latest time point it names: “Baseline, 12 and 24 weeks” is 24 weeks, a single visit is within a day, and one that names no duration, such as “end of treatment”, is left out of the timings.

A third read on 10 November 2026 added the papers the registry links to each study: those its sponsor lists as reporting results, and those PubMed links to it through the study's NCT number. A study has a results paper when one of them came out in or after the month of its primary completion and PubMed does not class it as a protocol, review or comment. A paper that never gives the NCT number is not linked, so some studies counted as reporting neither did publish.

Source: ClinicalTrials.gov, a database of the U.S. National Library of Medicine, which does not endorse these pages. Every study line is in the data release 2.1.0, and the explorer's own file is clinical-trials-studies.json.

Plan the cognitive outcomes of a schizophrenia and psychosis trial

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Hosted browser-native cognitive testing for academic and commercial research workflows.

A product of ConductScience, Inc.

New tests and features, about once a month. Unsubscribe at any time.

Tests

  • All cognitive tests
  • Test batteries
  • Use and evidence
  • Test norms
  • Trail Making Test
  • N-Back Task
  • Automated scoring
  • Study design
  • New tests by email

Guides

  • Methods and questions
  • Blog
  • Recruitment setup
  • Participant devices
  • Prolific
  • Sona Systems
  • CloudResearch Connect
  • Qualtrics

Use cases

  • Student participant pools
  • Aging and dementia research
  • Clinical trials
  • US clinical research
  • Remote testing

Compare and buy

  • Pricing
  • Compare platforms
  • Offline edition
  • FAQ

Trust

  • Study Quality Monitor
  • HIPAA-ready testing
  • Data export
  • Privacy Policy
  • Terms of Use
  • Data Policy

Company

  • ConductScience
  • Affiliate Program
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