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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
  6. /Verbal Learning

Clinical trials data

Verbal Learning in schizophrenia and psychosis trials: 112 registered studies

Every registered schizophrenia and psychosis study on ClinicalTrials.gov that names Verbal Learning in an outcome measure: how often it is a primary outcome, the tests named with it, how large the studies are and when they measure it.

Registered schizophrenia and psychosis studies name it in an outcome measure
112
Name it in a primary outcome, 33%
37 of 112
Of the condition's 640 studies name it, against 11% of all registered studies
18%
Other conditions
Median participants per study
61
By phase
Try Verbal LearningTry the Grocery Trip Game

Tests named in the same studies

The library tests that schizophrenia and psychosis studies naming Verbal Learning name most often beside it.
  1. 1

    Trail Making Test43 studies, 8 as a primary outcome

  2. 2

    Continuous Performance Test28 studies, 10 as a primary outcome

  3. 3

    Verbal Fluency24 studies, 6 as a primary outcome

  4. 4

    Category Fluency23 studies, 6 as a primary outcome

  5. 5

    Digit Span Test23 studies, 4 as a primary outcome

  6. 6

    Letter-Number Sequencing Task16 studies, 5 as a primary outcome

  7. 7

    Card Sorting Test (Berg)13 studies, 5 as a primary outcome

  8. 8

    Symbol Coding12 studies, 3 as a primary outcome

  9. 9

    Stroop Color-Word Test11 studies, 3 as a primary outcome

  10. 10

    Emoji Emotion Recognition8 studies, 2 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

Studies by start year

Each study counted once. 2026 is partly planned starts.
02000: 0 studies, 0 with a test as a primary outcome20002001: 1 studies, 0 with a test as a primary outcome2002: 5 studies, 5 with a test as a primary outcome2003: 3 studies, 1 with a test as a primary outcome2004: 3 studies, 2 with a test as a primary outcome2005: 5 studies, 1 with a test as a primary outcome20052006: 1 studies, 1 with a test as a primary outcome2007: 3 studies, 0 with a test as a primary outcome2008: 3 studies, 0 with a test as a primary outcome2009: 4 studies, 2 with a test as a primary outcome2010: 7 studies, 5 with a test as a primary outcome20102011: 3 studies, 0 with a test as a primary outcome2012: 3 studies, 2 with a test as a primary outcome2013: 3 studies, 1 with a test as a primary outcome2014: 9 studies, 3 with a test as a primary outcome2015: 6 studies, 2 with a test as a primary outcome20152016: 7 studies, 2 with a test as a primary outcome2017: 4 studies, 1 with a test as a primary outcome2018: 5 studies, 1 with a test as a primary outcome2019: 7 studies, 3 with a test as a primary outcome2020: 0 studies, 0 with a test as a primary outcome20202021: 6 studies, 2 with a test as a primary outcome2022: 5 studies, 0 with a test as a primary outcome2023: 3 studies, 0 with a test as a primary outcome2024: 5 studies, 0 with a test as a primary outcome2025: 4 studies, 1 with a test as a primary outcome20252026: 5 studies, 2 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
200000
200110
200255
200331
200432
200551
200611
200730
200830
200942
201075
201130
201232
201331
201493
201562
201672
201741
201851
201973
202000
202162
202250
202330
202450
202541
202652

Phases and study sizes

By phase

  • Early phase 15 studies, 2 as a primary outcome
  • Phase 14 studies, 3 as a primary outcome
  • Phase 1/22 studies, 0 as a primary outcome
  • Phase 218 studies, 8 as a primary outcome
  • Phase 2/34 studies, 1 as a primary outcome
  • Phase 39 studies, 3 as a primary outcome
  • Phase 412 studies, 3 as a primary outcome
  • Not applicable53 studies, 17 as a primary outcome
  • Observational5 studies, 0 as a primary outcome

Participants per study

102050100
  • Phase 244 median, 30 to 83
  • Phase 481 median, 39 to 122
  • Not applicable62 median, 39 to 108
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 that names Verbal Learning, by phase
PhaseStudies with a sizeMedianMiddle half
Phase 2184430 to 83
Phase 4128139 to 122
Not applicable516239 to 108

When schizophrenia and psychosis trials measure it

Half of the primary outcomes that name Verbal Learning are measured within 8 weeks of the start, and the middle half from 6 days to 13 weeks. 35 primary outcomes give a duration.

Latest time point of each outcome

  • Within a day19 outcomes, 8 as a primary outcome
  • Up to 4 weeks18 outcomes, 5 as a primary outcome
  • 1 to 3 months33 outcomes, 16 as a primary outcome
  • 3 to 6 months22 outcomes, 6 as a primary outcome
  • 6 to 12 months9 outcomes, 0 as a primary outcome
  • 1 to 2 years7 outcomes, 0 as a primary outcome
  • Over 2 years1 outcomes, 0 as a primary outcome
  • No duration given3 outcomes, 2 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

109 of the 112 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

  • Recruiting11 studies, 1 as a primary outcome
  • Not yet recruiting5 studies, 2 as a primary outcome
  • Active, not recruiting4 studies, 1 as a primary outcome
  • Completed66 studies, 30 as a primary outcome
  • Stopped early12 studies, 1 as a primary outcome
  • Status unknown14 studies, 2 as a primary outcome

What they test

  • Behavioral38 studies, 15 as a primary outcome
  • Drug57 studies, 23 as a primary outcome
  • Device12 studies, 1 as a primary outcome
  • Dietary supplement2 studies, 1 as a primary outcome
  • Procedure1 studies, 0 as a primary outcome
  • Biological1 studies, 0 as a primary outcome
  • Combination product1 studies, 0 as a primary outcome
  • Other18 studies, 6 as a primary outcome
  • None given1 studies, 0 as a primary outcome

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

Where their sites are

  • United States52 studies, 21 as a primary outcome
  • Canada11 studies, 3 as a primary outcome
  • Spain10 studies, 4 as a primary outcome
  • France8 studies, 0 as a primary outcome
  • United Kingdom7 studies, 3 as a primary outcome
  • China5 studies, 2 as a primary outcome
  • South Korea5 studies, 2 as a primary outcome
  • Italy4 studies, 2 as a primary outcome
  • Germany3 studies, 1 as a primary outcome
  • Austria2 studies, 1 as a primary outcome
  • Brazil2 studies, 0 as a primary outcome
  • Denmark2 studies, 1 as a primary outcome

28 countries in all. A study with sites in several counts in each; 7 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 that name Verbal Learning: 45 of 66, 68%

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

Completed schizophrenia and psychosis studies that name Verbal Learning and every completed study, by how they reported results
ResultsCompleted schizophrenia and psychosis studies that name Verbal LearningEvery completed study
Results on ClinicalTrials.gov and a paper12, 18%776, 10%
Results on ClinicalTrials.gov only19, 29%1,139, 14%
A results paper only14, 21%1,711, 22%
Neither21, 32%4,327, 54%

The 112 studies

Filter by phase, sponsor, status, country, intervention, outcome list, size and start year. Each study links to its record on ClinicalTrials.gov.
ConditionSchizophrenia and psychosis
TestVerbal Learning

112 studies match. 37 name Verbal Learning in a primary outcome. Median size 61 participants. Median time to the primary outcome: 8 weeks.

Loading 112 studies; the filters turn on when they arrive.

By start year
02.557.5102000: 0 studies, 0 naming Verbal Learning in a primary outcome20002001: 1 studies, 0 naming Verbal Learning in a primary outcome2002: 5 studies, 5 naming Verbal Learning in a primary outcome2003: 3 studies, 1 naming Verbal Learning in a primary outcome2004: 3 studies, 2 naming Verbal Learning in a primary outcome2005: 5 studies, 1 naming Verbal Learning in a primary outcome20052006: 1 studies, 1 naming Verbal Learning in a primary outcome2007: 3 studies, 0 naming Verbal Learning in a primary outcome2008: 3 studies, 0 naming Verbal Learning in a primary outcome2009: 4 studies, 2 naming Verbal Learning in a primary outcome2010: 7 studies, 5 naming Verbal Learning in a primary outcome20102011: 3 studies, 0 naming Verbal Learning in a primary outcome2012: 3 studies, 2 naming Verbal Learning in a primary outcome2013: 3 studies, 1 naming Verbal Learning in a primary outcome2014: 9 studies, 3 naming Verbal Learning in a primary outcome2015: 6 studies, 2 naming Verbal Learning in a primary outcome20152016: 7 studies, 2 naming Verbal Learning in a primary outcome2017: 4 studies, 1 naming Verbal Learning in a primary outcome2018: 5 studies, 1 naming Verbal Learning in a primary outcome2019: 7 studies, 3 naming Verbal Learning in a primary outcome2020: 0 studies, 0 naming Verbal Learning in a primary outcome20202021: 6 studies, 2 naming Verbal Learning in a primary outcome2022: 5 studies, 0 naming Verbal Learning in a primary outcome2023: 3 studies, 0 naming Verbal Learning in a primary outcome2024: 5 studies, 0 naming Verbal Learning in a primary outcome2025: 4 studies, 1 naming Verbal Learning in a primary outcome20252026: 5 studies, 2 naming Verbal Learning in a primary outcome

2026 is partly planned starts. Not shown: 1 that started before 2000 and 1 planned to start after 2026.

Show as a table
Matching studies by start year
Start yearStudiesAs a primary outcome
200000
200110
200255
200331
200432
200551
200611
200730
200830
200942
201075
201130
201232
201331
201493
201562
201672
201741
201851
201973
202000
202162
202250
202330
202450
202541
202652

Library tests named most

  • Verbal Learning112 studies, 37 as a primary outcome
  • Trail Making Test43 studies, 8 as a primary outcome
  • Continuous Performance Test28 studies, 10 as a primary outcome
  • Verbal Fluency24 studies, 6 as a primary outcome
  • Category Fluency23 studies, 6 as a primary outcome
  • Digit Span Test23 studies, 4 as a primary outcome
  • Letter-Number Sequencing Task16 studies, 5 as a primary outcome
  • Card Sorting Test (Berg)13 studies, 5 as a primary outcome
  • Symbol Coding12 studies, 3 as a primary outcome
  • Stroop Color-Word Test11 studies, 3 as a primary outcome

Conditions

  • Schizophrenia and psychosis112 studies, 37 as a primary outcome
  • Substance use and addiction16 studies, 6 as a primary outcome
  • Depression and bipolar disorder9 studies, 3 as a primary outcome
  • Healthy volunteers3 studies, 0 as a primary outcome
  • Anxiety, PTSD and OCD3 studies, 1 as a primary outcome
  • Aging, frailty and exercise2 studies, 1 as a primary outcome
  • Dementia and Alzheimer's1 study, 0 as a primary outcome
  • Parkinson's disease1 study, 0 as a primary outcome
  • Autism1 study, 1 as a primary outcome
  • Delirium, surgery and intensive care1 study, 0 as a primary outcome
  • Pain and fatigue1 study, 0 as a primary outcome

Phases

Participants

Lead sponsor: industry 9, other 103. Interventional 107, observational 5.

As a primary outcomeSecondary or other outcomeVerbal Learning

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
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
NCT07506070Start2026PhaseNot applicableConditionsSchizophrenia and psychosis, Depression and bipolar disorder, Autism, Anxiety, PTSD and OCDParticipants160Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Verbal LearningPrimary13 weeks
  • Verbal FluencyPrimary13 weeks
NCT07404085Start2025PhaseNot applicableConditionsSchizophrenia and psychosis, Depression and bipolar disorderParticipants160Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningPrimary8 weeks
  • Verbal FluencyPrimary8 weeks
  • Digit Span TestPrimary8 weeks
  • Tower PlanningPrimary8 weeks
  • Rapid Visual Information ProcessingPrimary8 weeks
  • Emoji Emotion RecognitionPrimary8 weeks
  • Letter-Number Sequencing TaskPrimary8 weeks
  • Spatial Working MemoryPrimary8 weeks
  • One-Touch Tower PlanningPrimary8 weeks
NCT07330843Start2026PhaseObservationalConditionsSchizophrenia and psychosisParticipants96Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Verbal LearningSecondarysame day
  • Matrix ReasoningSecondarysame day
NCT07056894Start2026PhaseNot applicableConditionsSchizophrenia and psychosis, Substance use and addictionParticipants50Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary5 months
  • Verbal LearningSecondary5 months
NCT07001878Start2025PhasePhase 4ConditionsSchizophrenia and psychosis, Substance use and addictionParticipants24Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary6 months
  • Verbal LearningSecondary6 months
NCT06870305Start2029PhaseNot applicableConditionsSchizophrenia and psychosisParticipants270Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Verbal LearningSecondary13 weeks
NCT06643871Start2024PhaseNot applicableConditionsSchizophrenia and psychosisParticipants40Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Trail Making TestSecondary15 weeks
  • Stroop Color-Word TestSecondary15 weeks
  • Verbal LearningSecondary15 weeks
  • Digit Span TestSecondary15 weeks
  • Corsi Block-Tapping TestSecondary15 weeks
  • Symbol Scan TaskSecondary15 weeks
NCT06542640Start2024PhaseNot applicableConditionsSchizophrenia and psychosis, Healthy volunteersParticipants300Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary2 years
  • Verbal LearningSecondary2 years
  • Verbal FluencySecondary2 years
  • Continuous Performance TestSecondary2 years
  • Category FluencySecondary2 years
NCT06529029Start2024PhasePhase 2/3ConditionsSchizophrenia and psychosis, Depression and bipolar disorderParticipants30Lead sponsorOtherStatusActive, not recruitingLibrary tests named
  • Verbal LearningOther outcome4 weeks
  • Verbal FluencyOther outcome4 weeks
NCT06464848Start2025PhaseObservationalConditionsSchizophrenia and psychosisParticipants48Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Verbal LearningSecondarysame day
  • Verbal FluencySecondarysame day
NCT06423651Start2022PhaseNot applicableConditionsSchizophrenia and psychosisParticipants160Lead sponsorOtherStatusStatus unknown

Paper

Library tests named
  • Trail Making TestSecondary6 months
  • Stroop Color-Word TestSecondary6 months
  • Verbal LearningSecondary6 months
  • Verbal FluencySecondary6 months
  • Continuous Performance TestSecondary6 months
  • Card Sorting Test (Berg)Secondary6 months
  • Matrix ReasoningSecondary6 months
  • Emoji Emotion RecognitionSecondary6 months
  • Letter-Number Sequencing TaskSecondary6 months
  • Indirect Hints TaskSecondary6 months
NCT06270108Start2022PhaseEarly phase 1ConditionsSchizophrenia and psychosis, Healthy volunteersParticipants288Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Verbal LearningSecondary8 weeks
NCT06038955Start2022PhaseNot applicableConditionsSchizophrenia and psychosis, Depression and bipolar disorderParticipants62Lead sponsorOtherStatusCompleted

Paper

Library tests named
  • Trail Making TestOther outcome13 weeks
  • Verbal LearningSecondary13 weeks
  • Verbal FluencyOther outcome13 weeks
  • Digit Span TestOther outcome13 weeks
  • Card Sorting Test (Berg)Other outcome13 weeks
  • Rapid Visual Information ProcessingOther outcome13 weeks
  • Letter-Number Sequencing TaskOther outcome13 weeks
  • Spatial Working MemoryOther outcome13 weeks
NCT06036316Start2024PhaseNot applicableConditionsSchizophrenia and psychosisParticipants90Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningSecondarysame day
NCT05958875Start2024PhasePhase 4ConditionsSchizophrenia and psychosisParticipants418Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary6 weeks
  • Verbal LearningSecondary6 weeks
  • Symbol CodingSecondary6 weeks
NCT05796401Start2023PhasePhase 3ConditionsSchizophrenia and psychosisParticipants500Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningSecondary8 months
  • Digit Span TestSecondary8 months
  • Finger Tapping TaskSecondary8 months
NCT05731414Start2023PhaseNot applicableConditionsSchizophrenia and psychosisParticipants360Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary18 months
  • Verbal LearningSecondary18 months
  • Verbal FluencySecondary18 months
  • Indirect Hints TaskSecondary18 months
NCT05603104Start2025PhasePhase 3ConditionsSchizophrenia and psychosis, Depression and bipolar disorderParticipants1Lead sponsorOtherStatusStopped earlyLibrary tests named
  • Trail Making TestSecondary6 weeks
  • Verbal LearningSecondary6 weeks
  • Symbol CodingSecondary6 weeks
NCT05405946Start2019PhaseNot applicableConditionsSchizophrenia and psychosisParticipants50Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Trail Making TestPrimary1 week
  • Verbal LearningPrimary1 week
  • Continuous Performance TestPrimary1 week
  • Card Sorting Test (Berg)Primary1 week
  • Complex Figure Copy and RecallPrimary1 week
  • Matrix ReasoningOther outcome1 week
NCT05337904Start2023PhaseNot applicableConditionsSchizophrenia and psychosisParticipants6Lead sponsorOtherStatusActive, not recruitingLibrary tests named
  • Trail Making TestSecondary12 months
  • Verbal LearningSecondary12 months
  • Verbal FluencySecondary12 months
  • Card Sorting Test (Berg)Secondary12 months
NCT05130853Start2021PhaseNot applicableConditionsSchizophrenia and psychosisParticipants48Lead sponsorOtherStatusCompleted

Paper

Library tests named
  • Trail Making TestPrimary13 weeks
  • Verbal LearningPrimary13 weeks
  • Continuous Performance TestPrimary13 weeks
  • Category FluencyPrimary13 weeks
NCT04951700Start2021PhaseObservationalConditionsSchizophrenia and psychosis, Aging, frailty and exerciseParticipants194Lead sponsorOtherStatusCompletedLibrary tests named
  • Verbal LearningOther outcome2 years
  • Mnemonic Similarity TaskPrimary2 years
NCT04822883Start2021PhasePhase 2ConditionsSchizophrenia and psychosisParticipants37Lead sponsorIndustryStatusCompletedLibrary tests named
  • Verbal LearningOther outcome4 days
  • Category FluencyOther outcome4 days

Page 1 of 5

Questions, answered from the data

How many schizophrenia and psychosis trials use Verbal Learning?

112 registered schizophrenia and psychosis studies on ClinicalTrials.gov name it in an outcome measure, 37 of them in a primary outcome: 18% of the condition's 640 studies with a cognitive outcome, against 11% of all of them. It is the test schizophrenia and psychosis trials name most.

Which tests do schizophrenia and psychosis trials use with Verbal Learning?

The Trail Making Test (43 studies), the Continuous Performance Test (28 studies) and Verbal Fluency (24 studies).

How many participants do phase 2 schizophrenia and psychosis trials that use Verbal Learning enroll?

Half of the phase 2 studies that name it enroll 44 participants or fewer, and the middle half enroll 30 to 83. 18 of them give a size.

When do schizophrenia and psychosis trials measure Verbal Learning?

Half of the primary outcomes that name Verbal Learning are measured within 8 weeks of the start, and the middle half from 6 days to 13 weeks. 35 primary outcomes give a duration.

How many completed schizophrenia and psychosis trials that use Verbal Learning have reported results?

45 of the 66 completed studies that name it, 68%, have reported results: 31 posted them on ClinicalTrials.gov, 26 have a results paper linked to the registry record, and 12 did both. The other 21 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

More on Verbal Learning and schizophrenia and psychosis

  • Every cognitive test in schizophrenia and psychosis trials: 640 studies
  • Verbal Learning in all clinical trials: 1,832 studies

Verbal Learning in other conditions

  • Cancer235
  • Dementia and Alzheimer's224
  • Mild cognitive impairment183
  • Depression and bipolar disorder178
  • Multiple sclerosis139
  • Aging, frailty and exercise128
  • Brain injury and concussion111
  • Cognitive impairment and decline79
  • Substance use and addiction77
  • Obesity and diabetes74
  • Pain and fatigue72
  • Anxiety, PTSD and OCD70
  • Sleep and sleep disorders66
  • Cardiovascular disease64
  • Stroke63
  • Parkinson's disease61
  • Healthy volunteers56
  • Delirium, surgery and intensive care51

Other tests in schizophrenia and psychosis trials

  • Verbal Fluency107
  • Trail Making Test102
  • Continuous Performance Test78
  • Digit Span Test66
  • N-Back Task66
  • Emoji Emotion Recognition52
  • Card Sorting Test (Berg)50

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.

The census counts Verbal Learning and Grocery Trip Game as one test family, so this page counts their studies together.

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