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  1. Home
  2. /Data
  3. /Clinical trials
  4. /Conditions
  5. /Anxiety, PTSD and OCD
  6. /Verbal Learning

Clinical trials data

Verbal Learning in anxiety, PTSD and OCD trials: 70 registered studies

Every registered anxiety, PTSD and OCD 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 anxiety, PTSD and OCD studies name it in an outcome measure
70
Name it in a primary outcome, 39%
27 of 70
Of the condition's 692 studies name it, against 11% of all registered studies
10%
Other conditions
Median participants per study
60
By phase
Try Verbal LearningTry the Grocery Trip Game

Tests named in the same studies

The library tests that anxiety, PTSD and OCD studies naming Verbal Learning name most often beside it.
  1. 1

    Digit Span Test23 studies, 8 as a primary outcome

  2. 2

    Verbal Fluency22 studies, 11 as a primary outcome

  3. 3

    Trail Making Test22 studies, 10 as a primary outcome

  4. 4

    Stroop Color-Word Test17 studies, 5 as a primary outcome

  5. 5

    Symbol Coding11 studies, 2 as a primary outcome

  6. 6

    Continuous Performance Test9 studies, 6 as a primary outcome

  7. 7

    Go/No-Go Task8 studies, 3 as a primary outcome

  8. 8

    Card Sorting Test (Berg)6 studies, 2 as a primary outcome

  9. 9

    Iowa Gambling Lite6 studies, 1 as a primary outcome

  10. 10

    AX Continuous Performance Test6 studies, 0 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: 0 studies, 0 with a test as a primary outcome2002: 0 studies, 0 with a test as a primary outcome2003: 1 studies, 1 with a test as a primary outcome2004: 1 studies, 1 with a test as a primary outcome2005: 0 studies, 0 with a test as a primary outcome20052006: 0 studies, 0 with a test as a primary outcome2007: 0 studies, 0 with a test as a primary outcome2008: 1 studies, 0 with a test as a primary outcome2009: 2 studies, 0 with a test as a primary outcome2010: 3 studies, 1 with a test as a primary outcome20102011: 1 studies, 1 with a test as a primary outcome2012: 2 studies, 1 with a test as a primary outcome2013: 1 studies, 0 with a test as a primary outcome2014: 2 studies, 0 with a test as a primary outcome2015: 4 studies, 4 with a test as a primary outcome20152016: 5 studies, 1 with a test as a primary outcome2017: 4 studies, 1 with a test as a primary outcome2018: 2 studies, 1 with a test as a primary outcome2019: 5 studies, 2 with a test as a primary outcome2020: 3 studies, 1 with a test as a primary outcome20202021: 10 studies, 6 with a test as a primary outcome2022: 2 studies, 0 with a test as a primary outcome2023: 5 studies, 1 with a test as a primary outcome2024: 6 studies, 2 with a test as a primary outcome2025: 5 studies, 1 with a test as a primary outcome20252026: 4 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
200100
200200
200311
200411
200500
200600
200700
200810
200920
201031
201111
201221
201310
201420
201544
201651
201741
201821
201952
202031
2021106
202220
202351
202462
202551
202642

Phases and study sizes

By phase

  • Early phase 13 studies, 2 as a primary outcome
  • Phase 14 studies, 2 as a primary outcome
  • Phase 1/24 studies, 2 as a primary outcome
  • Phase 28 studies, 1 as a primary outcome
  • Phase 2/31 studies, 0 as a primary outcome
  • Phase 32 studies, 0 as a primary outcome
  • Phase 42 studies, 0 as a primary outcome
  • Not applicable42 studies, 17 as a primary outcome
  • Observational4 studies, 3 as a primary outcome

Participants per study

102050100
  • Not applicable60 median, 41 to 98
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 anxiety, PTSD and OCD study that names Verbal Learning, by phase
PhaseStudies with a sizeMedianMiddle half
Not applicable386041 to 98

When anxiety, PTSD and OCD trials measure it

Half of the primary outcomes that name Verbal Learning are measured within 13 weeks of the start, and the middle half from 8 weeks to 6 months. 22 primary outcomes give a duration.

Latest time point of each outcome

  • Within a day5 outcomes, 1 as a primary outcome
  • Up to 4 weeks8 outcomes, 2 as a primary outcome
  • 1 to 3 months29 outcomes, 11 as a primary outcome
  • 3 to 6 months14 outcomes, 5 as a primary outcome
  • 6 to 12 months6 outcomes, 1 as a primary outcome
  • 1 to 2 years3 outcomes, 2 as a primary outcome
  • No duration given5 outcomes, 5 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

65 of the 70 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

  • Recruiting11 studies, 4 as a primary outcome
  • Not yet recruiting2 studies, 1 as a primary outcome
  • Active, not recruiting4 studies, 1 as a primary outcome
  • Completed34 studies, 15 as a primary outcome
  • Stopped early11 studies, 4 as a primary outcome
  • Status unknown8 studies, 2 as a primary outcome

What they test

  • Behavioral25 studies, 11 as a primary outcome
  • Drug18 studies, 5 as a primary outcome
  • Device12 studies, 4 as a primary outcome
  • Dietary supplement6 studies, 3 as a primary outcome
  • Procedure1 studies, 1 as a primary outcome
  • Radiation2 studies, 1 as a primary outcome
  • Other13 studies, 6 as a primary outcome
  • None given2 studies, 2 as a primary outcome

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

Where their sites are

  • United States38 studies, 15 as a primary outcome
  • Canada12 studies, 5 as a primary outcome
  • Netherlands3 studies, 1 as a primary outcome
  • United Kingdom2 studies, 0 as a primary outcome
  • China1 studies, 0 as a primary outcome
  • Denmark1 studies, 1 as a primary outcome
  • Egypt1 studies, 0 as a primary outcome
  • France1 studies, 0 as a primary outcome
  • Germany1 studies, 1 as a primary outcome
  • India1 studies, 1 as a primary outcome
  • Norway1 studies, 0 as a primary outcome
  • Poland1 studies, 0 as a primary outcome

14 countries in all. A study with sites in several counts in each; 5 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 anxiety, PTSD and OCD studies that name Verbal Learning: 16 of 34, 47%

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

Completed anxiety, PTSD and OCD studies that name Verbal Learning and every completed study, by how they reported results
ResultsCompleted anxiety, PTSD and OCD studies that name Verbal LearningEvery completed study
Results on ClinicalTrials.gov and a paper5, 15%776, 10%
Results on ClinicalTrials.gov only8, 24%1,139, 14%
A results paper only3, 9%1,711, 22%
Neither18, 53%4,327, 54%

The 70 studies

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

70 studies match. 27 name Verbal Learning in a primary outcome. Median size 60 participants. Median time to the primary outcome: 13 weeks.

Loading 70 studies; the filters turn on when they arrive.

By start year
02.557.5102000: 0 studies, 0 naming Verbal Learning in a primary outcome20002001: 0 studies, 0 naming Verbal Learning in a primary outcome2002: 0 studies, 0 naming Verbal Learning in a primary outcome2003: 1 studies, 1 naming Verbal Learning in a primary outcome2004: 1 studies, 1 naming Verbal Learning in a primary outcome2005: 0 studies, 0 naming Verbal Learning in a primary outcome20052006: 0 studies, 0 naming Verbal Learning in a primary outcome2007: 0 studies, 0 naming Verbal Learning in a primary outcome2008: 1 studies, 0 naming Verbal Learning in a primary outcome2009: 2 studies, 0 naming Verbal Learning in a primary outcome2010: 3 studies, 1 naming Verbal Learning in a primary outcome20102011: 1 studies, 1 naming Verbal Learning in a primary outcome2012: 2 studies, 1 naming Verbal Learning in a primary outcome2013: 1 studies, 0 naming Verbal Learning in a primary outcome2014: 2 studies, 0 naming Verbal Learning in a primary outcome2015: 4 studies, 4 naming Verbal Learning in a primary outcome20152016: 5 studies, 1 naming Verbal Learning in a primary outcome2017: 4 studies, 1 naming Verbal Learning in a primary outcome2018: 2 studies, 1 naming Verbal Learning in a primary outcome2019: 5 studies, 2 naming Verbal Learning in a primary outcome2020: 3 studies, 1 naming Verbal Learning in a primary outcome20202021: 10 studies, 6 naming Verbal Learning in a primary outcome2022: 2 studies, 0 naming Verbal Learning in a primary outcome2023: 5 studies, 1 naming Verbal Learning in a primary outcome2024: 6 studies, 2 naming Verbal Learning in a primary outcome2025: 5 studies, 1 naming Verbal Learning in a primary outcome20252026: 4 studies, 2 naming Verbal Learning in a primary outcome

2026 is partly planned starts. Not shown: 1 planned to start after 2026.

Show as a table
Matching studies by start year
Start yearStudiesAs a primary outcome
200000
200100
200200
200311
200411
200500
200600
200700
200810
200920
201031
201111
201221
201310
201420
201544
201651
201741
201821
201952
202031
2021106
202220
202351
202462
202551
202642

Library tests named most

  • Verbal Learning70 studies, 27 as a primary outcome
  • Digit Span Test23 studies, 8 as a primary outcome
  • Verbal Fluency22 studies, 11 as a primary outcome
  • Trail Making Test22 studies, 10 as a primary outcome
  • Stroop Color-Word Test17 studies, 5 as a primary outcome
  • Symbol Coding11 studies, 2 as a primary outcome
  • Continuous Performance Test9 studies, 6 as a primary outcome
  • Go/No-Go Task8 studies, 3 as a primary outcome
  • Card Sorting Test (Berg)6 studies, 2 as a primary outcome
  • Iowa Gambling Lite6 studies, 1 as a primary outcome

Largest condition groups

  • Anxiety, PTSD and OCD70 studies, 27 as a primary outcome
  • Depression and bipolar disorder23 studies, 9 as a primary outcome
  • Pain and fatigue12 studies, 4 as a primary outcome
  • Brain injury and concussion10 studies, 6 as a primary outcome
  • Substance use and addiction10 studies, 2 as a primary outcome
  • Sleep and sleep disorders7 studies, 2 as a primary outcome
  • Cancer6 studies, 3 as a primary outcome
  • Schizophrenia and psychosis3 studies, 1 as a primary outcome
  • Delirium, surgery and intensive care2 studies, 0 as a primary outcome
  • Stroke1 study, 1 as a primary outcome
  • Parkinson's disease1 study, 0 as a primary outcome
  • ADHD1 study, 0 as a primary outcome

Phases

Participants

Lead sponsor: industry 1, other 69. Interventional 66, observational 4.

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
NCT07693686Start2027PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants176Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Verbal LearningOther outcome10 weeks
  • Verbal FluencyOther outcome10 weeks
  • Digit Span TestOther outcome10 weeks
  • Continuous Performance TestOther outcome10 weeks
  • Choice Reaction TimeOther outcome10 weeks
  • AX Continuous Performance TestOther outcome10 weeks
  • Letter-Number Sequencing TaskOther outcome10 weeks
NCT07550140Start2026PhaseNot applicableConditionsDepression and bipolar disorder, Sleep and sleep disorders, Anxiety, PTSD and OCDParticipants60Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningSecondary12 weeks
  • Delayed Recall ModuleSecondary12 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
NCT07393672Start2026PhasePhase 2ConditionsAnxiety, PTSD and OCD, Pain and fatigueParticipants104Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary13 weeks
  • Stroop Color-Word TestSecondary13 weeks
  • Verbal LearningSecondary13 weeks
  • Verbal FluencySecondary13 weeks
  • Digit Span TestSecondary13 weeks
  • Symbol CodingSecondary
  • N-Back TaskSecondary13 weeks
  • Go/No-Go TaskSecondary13 weeks
  • Simple Reaction TimeSecondary13 weeks
  • Corsi Block-Tapping TestSecondary13 weeks
NCT07309302Start2025PhaseNot applicableConditionsDepression and bipolar disorder, Anxiety, PTSD and OCDParticipants64Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary5 months
  • Stroop Color-Word TestPrimary5 months
  • Verbal LearningPrimary5 months
  • Verbal FluencyPrimary5 months
  • Symbol CodingPrimary5 months
  • Continuous Performance TestPrimary5 months
  • Category FluencyPrimary5 months
  • Eriksen Flanker TaskPrimary5 months
  • Balloon RiskPrimary5 months
  • Emotional Stroop TaskPrimary5 months
  • Visual Search TestPrimary5 months
  • Serial Naming TaskPrimary5 months
NCT07055633Start2026PhaseNot applicableConditionsBrain injury and concussion, Anxiety, PTSD and OCDParticipants144Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningPrimary10 weeks
  • Digit Span TestPrimary10 weeks
NCT06831916Start2025PhasePhase 2ConditionsAnxiety, PTSD and OCD, Pain and fatigueParticipants104Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestSecondary13 weeks
  • Stroop Color-Word TestSecondary13 weeks
  • Verbal LearningSecondary13 weeks
  • Verbal FluencySecondary13 weeks
  • Digit Span TestSecondary13 weeks
  • Symbol CodingSecondary
  • N-Back TaskSecondary13 weeks
  • Go/No-Go TaskSecondary13 weeks
  • Simple Reaction TimeSecondary13 weeks
  • Corsi Block-Tapping TestSecondary13 weeks
  • DRM False Memory TaskSecondary13 weeks
NCT06796712Start2025PhaseNot applicableConditionsDepression and bipolar disorder, Anxiety, PTSD and OCDParticipants55Lead sponsorOtherStatusCompleted

Paper

Library tests named
  • Verbal LearningSecondary12 weeks
  • Delayed Recall ModuleSecondary12 weeks
NCT06700590Start2024PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants186Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningSecondary4 months
NCT06638996Start2024PhaseNot applicableConditionsAnxiety, PTSD and OCD, Pain and fatigueParticipants100Lead sponsorOtherStatusCompletedLibrary tests named
  • Verbal LearningPrimary1 week
  • Digit Span TestPrimary1 week
  • DRM False Memory TaskPrimary1 week
NCT06381180Start2025PhasePhase 1/2ConditionsSubstance use and addiction, Anxiety, PTSD and OCDParticipants500Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningSecondary9 months
  • Card Sorting Test (Berg)Secondary9 months
  • Delay DiscountingSecondary9 months
  • Iowa Gambling LiteSecondary9 months
NCT06356805Start2023PhaseNot applicableConditionsAnxiety, PTSD and OCD, Pain and fatigueParticipants42Lead sponsorOtherStatusCompletedLibrary tests named
  • Verbal LearningSecondary13 weeks
NCT06354361Start2024PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants33Lead sponsorOtherStatusCompletedLibrary tests named
  • Verbal LearningSecondary13 weeks
  • Digit Span TestSecondary13 weeks
  • Go/No-Go TaskPrimary13 weeks
NCT06335407Start2025PhasePhase 1ConditionsSubstance use and addiction, Anxiety, PTSD and OCDParticipants10Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningSecondary4 weeks
NCT06290063Start2024PhasePhase 2ConditionsDepression and bipolar disorder, Sleep and sleep disorders, Anxiety, PTSD and OCD, Pain and fatigueParticipants385Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningPrimary8 weeks
NCT06198023Start2024PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants60Lead sponsorOtherStatusActive, not recruitingLibrary tests named
  • Verbal LearningSecondary12 months
  • Ball-Toss GameSecondary12 months
  • Trust GameSecondary12 months
NCT06135064Start2024PhasePhase 1/2ConditionsAnxiety, PTSD and OCDParticipants10Lead sponsorOtherStatusStopped earlyLibrary tests named
  • Verbal LearningSecondary13 weeks
  • Dimensional Change Card SortSecondary13 weeks
  • Size Order Memory TestSecondary13 weeks
  • Picture Order Memory TestSecondary13 weeks
NCT06032377Start2023PhaseNot applicableConditionsDepression and bipolar disorder, Sleep and sleep disorders, Anxiety, PTSD and OCDParticipants275Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary6 months
  • Stroop Color-Word TestSecondary6 months
  • Verbal LearningSecondary6 months
  • Verbal FluencySecondary6 months
  • Digit Span TestSecondary6 months
  • Symbol CodingSecondary6 months
  • Picture Naming TestSecondary6 months
  • Short Story RecallSecondary6 months
  • Paired Associate LearningSecondary6 months
  • Rapid Visual Information ProcessingSecondary6 months
  • Intra/Extra Dimensional Set ShiftPrimary6 months
  • Pattern Recognition MemorySecondary6 months
NCT05964062Start2023PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants30Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Trail Making TestSecondary5 days
  • Stroop Color-Word TestSecondary5 days
  • Verbal LearningSecondary5 days
NCT05964049Start2023PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants30Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Trail Making TestSecondary2 weeks
  • Stroop Color-Word TestSecondary2 weeks
  • Verbal LearningSecondary2 weeks
NCT05541887Start2023PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants25Lead sponsorOtherStatusStopped earlyLibrary tests named
  • Verbal LearningPrimary6 weeks
  • Dimensional Change Card SortPrimary6 weeks
  • Size Order Memory TestPrimary6 weeks
NCT05386862Start2022PhaseNot applicableConditionsSubstance use and addiction, Anxiety, PTSD and OCDParticipantsNot givenLead sponsorOtherStatusStopped earlyLibrary tests named
  • Verbal LearningSecondary12 months
  • Iowa Gambling LiteSecondary12 months
NCT05289258Start2021PhaseNot applicableConditionsDepression and bipolar disorder, Cancer, Anxiety, PTSD and OCDParticipants123Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary
  • Verbal LearningPrimary
  • Verbal FluencyPrimary
NCT05257044Start2022PhasePhase 1ConditionsAnxiety, PTSD and OCDParticipants38Lead sponsorOtherStatusCompletedLibrary tests named
  • Verbal LearningSecondarysame day
NCT05090839Start2021PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants40Lead sponsorOtherStatusCompleted

Results

Library tests named
  • Verbal LearningPrimarysame day

Page 1 of 3

Questions, answered from the data

How many anxiety, PTSD and OCD trials use Verbal Learning?

70 registered anxiety, PTSD and OCD studies on ClinicalTrials.gov name it in an outcome measure, 27 of them in a primary outcome: 10% of the condition's 692 studies with a cognitive outcome, against 11% of all of them. It is the 3rd most named test in anxiety, PTSD and OCD trials.

Which tests do anxiety, PTSD and OCD trials use with Verbal Learning?

The Digit Span Test (23 studies), Verbal Fluency (22 studies) and the Trail Making Test (22 studies).

When do anxiety, PTSD and OCD trials measure Verbal Learning?

Half of the primary outcomes that name Verbal Learning are measured within 13 weeks of the start, and the middle half from 8 weeks to 6 months. 22 primary outcomes give a duration.

How many completed anxiety, PTSD and OCD trials that use Verbal Learning have reported results?

16 of the 34 completed studies that name it, 47%, have reported results: 13 posted them on ClinicalTrials.gov, 8 have a results paper linked to the registry record, and 5 did both. The other 18 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

More on Verbal Learning and anxiety, PTSD and OCD

  • Every cognitive test in anxiety, PTSD and OCD trials: 692 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
  • Schizophrenia and psychosis112
  • Brain injury and concussion111
  • Cognitive impairment and decline79
  • Substance use and addiction77
  • Obesity and diabetes74
  • Pain and fatigue72
  • Sleep and sleep disorders66
  • Cardiovascular disease64
  • Stroke63
  • Parkinson's disease61
  • Healthy volunteers56
  • Delirium, surgery and intensive care51

Other tests in anxiety, PTSD and OCD trials

  • Stroop Color-Word Test79
  • Digit Span Test72
  • Trail Making Test69
  • Go/No-Go Task63
  • Verbal Fluency61

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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