ConductCognition

  • Domains

    Tests

    • Processing speed43
    • Attention113
    • Working memory50
    • Executive function143
    • Episodic memory72
    • Response inhibition9
    • Social cognition75
    • Language42

    Most used

    Evidence

    1. Verbal Fluency TestGradeA
    2. Stroop Color-Word TestGradeA
    3. Trail Making TestGradeA
    4. N-Back TaskGradeA
    5. Go/No-Go TaskGradeA
    6. Digit Span TestGradeA
    7. Symbol Coding TestGradeA
    8. Verbal Learning TestGradeA
    REDTry it nowStroop Color-Word Test
    All 547 tests

    Browse by

    • Phone290
    • Tablet323
    • Untimed326
    • Up to 5 minutes69
    • Evidence grade A40

  • First studies

    Grade, length

    • Reaction Time StudyGradeA7 min
    • Pilot ScreeningGradeA15 min
    • Medication StudiesGradeA−26 min
    • Language-Minimized ScreeningGradeA−30 min

    Age groups

    • Older Adult Executive SpeedGradeA20 min
    • School-AgeGradeA−33 min

    Memory

    • At-Home MemoryGradeA26 min
    • Working Memory and LearningGradeA−19 min
    • Associative MemoryGradeB32 min
    • Working Memory CapacityGradeB34 min

    Language and perception

    • LanguageGradeA−33 min
    • Visual PerceptionGradeB27 min
    • Listening and Auditory ProcessingGradeB31 min

    Executive function and attention

    • Executive ControlGradeA18 min
    • Attention and ImpulsivityGradeA−26 min
    • Visual AttentionGradeB27 min
    • Creativity and Flexible ThinkingGradeB30 min
    • Reasoning and SpatialGradeB32 min

    Movement

    • Motor and AttentionGradeA−29 min
    • Motor LearningGradeB34 min

    Behavior, mood and choice

    • Food Choice and Self-ControlGradeA−29 min
    • Sleep and FatigueGradeB23 min
    • Social CognitionGradeB23 min
    • Impulsivity and Substance UseGradeB26 min
    • Emotion and MoodGradeB28 min
    • Decisions and RewardGradeB29 min
    All 26 batteries

    Find one

    Up to 15 minutes2Up to 30 minutes19Phone8
    Test order labBattery gradesHow batteries work

  • Use and evidence

    • Overview
    • Compare all 547 tests
    • Test-retest
    • Reliability and validity
    • Battery grades26
    • Download and cite

    Clinical trials

    • Overview
    • By condition25
    • By test101
    • Trial design benchmark
    • Cognitive outcomes, 2026

    Conditions

    Registered studies

    • Dementia and Alzheimer's1,673
    • Aging, frailty and exercise1,398
    • Depression and bipolar disorder1,247
    • Stroke1,233
    • Substance use and addiction895
    • Parkinson's disease892
    • Cancer760
    All 25 conditions
    16,361Registered studies name a cognitive test in an outcome measure11,688 name a test you can run hereExplore the studies
  • 1

    Build

    • Study design
    • Customize tests
    • Repeat visits
    • Study cost calculator
    2

    Recruit

    • Recruitment setup
    • Prolific
    • Sona Systems
    • CloudResearch Connect
    • Qualtrics
    3

    Run

    • Remote testing
    • Participant devices
    • Phone timing check
    • Offline edition
    4

    Results

    • Automated scoring
    • Test norms
    • Study Quality Monitor
    • Data export
    Platform overview

    Compliance

    • HIPAA-ready testing
    • US clinical research
    • Data Policy
    • Privacy Policy
    • Terms of Use

  • Research areas

    Tests used in each

    • Aging and dementia188
    • Decisions and reward105
    • Child development and education87
    • Language and bilingualism64
    • Social behavior62
    • Psychiatric groups35
    • Training and intervention28
    • Mood, anxiety and trauma25
    • Substance use and impulsivity25
    • Neurological and movement research19
    • Brain injury and concussion14
    • Sleep and fatigue14
    • ADHD11
    • Eating and obesity8
    • Medication and drug trials8

    Research settings

    • Student participant pools
    • Teaching a class
    • Clinical trials
    • US clinical research
    • Sites without internet
    Planning a study?

  • Methods

    • How evidence grades work
    • How test batteries work
    • How test order works
    Methods and questions

    Help

    • FAQ
    • Recruitment guides
    • Compare platforms

    Updates

    • Blog
    • New tests by email
    Latest post10 November 2026What you can do in ConductCognition todayA short tour of ConductCognition as it stands on 10 November. After this, we'll post when something changes how you run a study.Read the post
  • Pricing
Start Free
Log In
Log InStart Free
  1. Home
  2. /Data
  3. /Clinical trials
  4. /Conditions
  5. /ADHD
  6. /Continuous Performance Test

Clinical trials data

Continuous Performance Test in ADHD trials: 123 registered studies

Every registered ADHD study on ClinicalTrials.gov that names the Continuous Performance Test 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 ADHD studies name it in an outcome measure
123
Name it in a primary outcome, 46%
56 of 123
Of the condition's 357 studies name it, against 4% of all registered studies
34%
Other conditions
Median participants per study
71
By phase
Try the Continuous Performance Test

Tests named in the same studies

The library tests that ADHD studies naming the Continuous Performance Test name most often beside it.
  1. 1

    AX Continuous Performance Test36 studies, 0 as a primary outcome

  2. 2

    Digit Span Test22 studies, 8 as a primary outcome

  3. 3

    Go/No-Go Task16 studies, 9 as a primary outcome

  4. 4

    N-Back Task9 studies, 5 as a primary outcome

  5. 5

    Stroop Color-Word Test8 studies, 2 as a primary outcome

  6. 6

    Stop-Signal Task6 studies, 3 as a primary outcome

  7. 7

    Card Sorting Test (Berg)6 studies, 1 as a primary outcome

  8. 8

    Verbal Fluency4 studies, 2 as a primary outcome

  9. 9

    Corsi Block-Tapping Test4 studies, 1 as a primary outcome

  10. 10

    Trail Making Test4 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, 0 with a test as a primary outcome2004: 1 studies, 1 with a test as a primary outcome2005: 3 studies, 1 with a test as a primary outcome20052006: 2 studies, 1 with a test as a primary outcome2007: 2 studies, 1 with a test as a primary outcome2008: 2 studies, 1 with a test as a primary outcome2009: 6 studies, 3 with a test as a primary outcome2010: 0 studies, 0 with a test as a primary outcome20102011: 4 studies, 1 with a test as a primary outcome2012: 6 studies, 2 with a test as a primary outcome2013: 3 studies, 2 with a test as a primary outcome2014: 5 studies, 3 with a test as a primary outcome2015: 6 studies, 2 with a test as a primary outcome20152016: 8 studies, 2 with a test as a primary outcome2017: 10 studies, 4 with a test as a primary outcome2018: 7 studies, 2 with a test as a primary outcome2019: 7 studies, 1 with a test as a primary outcome2020: 8 studies, 5 with a test as a primary outcome20202021: 6 studies, 3 with a test as a primary outcome2022: 6 studies, 5 with a test as a primary outcome2023: 7 studies, 4 with a test as a primary outcome2024: 10 studies, 4 with a test as a primary outcome2025: 7 studies, 6 with a test as a primary outcome20252026: 4 studies, 1 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
200310
200411
200531
200621
200721
200821
200963
201000
201141
201262
201332
201453
201562
201682
2017104
201872
201971
202085
202163
202265
202374
2024104
202576
202641

Phases and study sizes

By phase

  • Early phase 17 studies, 3 as a primary outcome
  • Phase 14 studies, 3 as a primary outcome
  • Phase 1/23 studies, 0 as a primary outcome
  • Phase 26 studies, 4 as a primary outcome
  • Phase 2/31 studies, 1 as a primary outcome
  • Phase 311 studies, 4 as a primary outcome
  • Phase 415 studies, 6 as a primary outcome
  • Not applicable62 studies, 29 as a primary outcome
  • Observational14 studies, 6 as a primary outcome

Participants per study

102050100200500
  • Phase 364 median, 37 to 199
  • Phase 489 median, 33 to 140
  • Not applicable70 median, 35 to 108
  • Observational202 median, 86 to 343
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 ADHD study that names the Continuous Performance Test, by phase
PhaseStudies with a sizeMedianMiddle half
Phase 3116437 to 199
Phase 4158933 to 140
Not applicable607035 to 108
Observational1420286 to 343

When ADHD trials measure it

Half of the primary outcomes that name the Continuous Performance Test are measured within 8 weeks of the start, and the middle half from 3 weeks to 13 weeks. 51 primary outcomes give a duration.

Latest time point of each outcome

  • Within a day19 outcomes, 7 as a primary outcome
  • Up to 4 weeks23 outcomes, 11 as a primary outcome
  • 1 to 3 months46 outcomes, 26 as a primary outcome
  • 3 to 6 months13 outcomes, 5 as a primary outcome
  • 6 to 12 months9 outcomes, 1 as a primary outcome
  • 1 to 2 years2 outcomes, 1 as a primary outcome
  • Over 2 years2 outcomes, 0 as a primary outcome
  • No duration given8 outcomes, 5 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

114 of the 122 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

  • Recruiting13 studies, 4 as a primary outcome
  • Not yet recruiting4 studies, 1 as a primary outcome
  • Active, not recruiting1 studies, 0 as a primary outcome
  • Completed77 studies, 35 as a primary outcome
  • Stopped early9 studies, 6 as a primary outcome
  • Status unknown19 studies, 10 as a primary outcome

What they test

  • Behavioral26 studies, 12 as a primary outcome
  • Drug47 studies, 19 as a primary outcome
  • Device16 studies, 9 as a primary outcome
  • Dietary supplement19 studies, 9 as a primary outcome
  • Procedure3 studies, 1 as a primary outcome
  • Diagnostic test1 studies, 1 as a primary outcome
  • Biological1 studies, 1 as a primary outcome
  • Other31 studies, 16 as a primary outcome
  • None given5 studies, 1 as a primary outcome

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

Where their sites are

  • United States45 studies, 25 as a primary outcome
  • Taiwan15 studies, 6 as a primary outcome
  • Spain9 studies, 2 as a primary outcome
  • France7 studies, 0 as a primary outcome
  • Germany7 studies, 1 as a primary outcome
  • Hong Kong5 studies, 2 as a primary outcome
  • United Kingdom4 studies, 2 as a primary outcome
  • Brazil3 studies, 1 as a primary outcome
  • China3 studies, 2 as a primary outcome
  • Egypt3 studies, 1 as a primary outcome
  • Israel3 studies, 1 as a primary outcome
  • Netherlands3 studies, 1 as a primary outcome

24 countries in all. A study with sites in several counts in each; 6 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 ADHD studies that name the Continuous Performance Test: 37 of 77, 48%

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

Completed ADHD studies that name the Continuous Performance Test and every completed study, by how they reported results
ResultsCompleted ADHD studies that name the Continuous Performance TestEvery completed study
Results on ClinicalTrials.gov and a paper8, 10%776, 10%
Results on ClinicalTrials.gov only15, 19%1,139, 14%
A results paper only14, 18%1,711, 22%
Neither40, 52%4,327, 54%

The 123 studies

Filter by phase, sponsor, status, country, intervention, outcome list, size and start year. Each study links to its record on ClinicalTrials.gov.
ConditionADHD
TestThe Continuous Performance Test

123 studies match. 56 name the Continuous Performance Test in a primary outcome. Median size 71 participants. Median time to the primary outcome: 8 weeks.

Loading 123 studies; the filters turn on when they arrive.

By start year
02.557.5102000: 0 studies, 0 naming the Continuous Performance Test in a primary outcome20002001: 0 studies, 0 naming the Continuous Performance Test in a primary outcome2002: 0 studies, 0 naming the Continuous Performance Test in a primary outcome2003: 1 studies, 0 naming the Continuous Performance Test in a primary outcome2004: 1 studies, 1 naming the Continuous Performance Test in a primary outcome2005: 3 studies, 1 naming the Continuous Performance Test in a primary outcome20052006: 2 studies, 1 naming the Continuous Performance Test in a primary outcome2007: 2 studies, 1 naming the Continuous Performance Test in a primary outcome2008: 2 studies, 1 naming the Continuous Performance Test in a primary outcome2009: 6 studies, 3 naming the Continuous Performance Test in a primary outcome2010: 0 studies, 0 naming the Continuous Performance Test in a primary outcome20102011: 4 studies, 1 naming the Continuous Performance Test in a primary outcome2012: 6 studies, 2 naming the Continuous Performance Test in a primary outcome2013: 3 studies, 2 naming the Continuous Performance Test in a primary outcome2014: 5 studies, 3 naming the Continuous Performance Test in a primary outcome2015: 6 studies, 2 naming the Continuous Performance Test in a primary outcome20152016: 8 studies, 2 naming the Continuous Performance Test in a primary outcome2017: 10 studies, 4 naming the Continuous Performance Test in a primary outcome2018: 7 studies, 2 naming the Continuous Performance Test in a primary outcome2019: 7 studies, 1 naming the Continuous Performance Test in a primary outcome2020: 8 studies, 5 naming the Continuous Performance Test in a primary outcome20202021: 6 studies, 3 naming the Continuous Performance Test in a primary outcome2022: 6 studies, 5 naming the Continuous Performance Test in a primary outcome2023: 7 studies, 4 naming the Continuous Performance Test in a primary outcome2024: 10 studies, 4 naming the Continuous Performance Test in a primary outcome2025: 7 studies, 6 naming the Continuous Performance Test in a primary outcome20252026: 4 studies, 1 naming the Continuous Performance Test 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
200100
200200
200310
200411
200531
200621
200721
200821
200963
201000
201141
201262
201332
201453
201562
201682
2017104
201872
201971
202085
202163
202265
202374
2024104
202576
202641

Library tests named most

  • Continuous Performance Test123 studies, 56 as a primary outcome
  • AX Continuous Performance Test36 studies, 0 as a primary outcome
  • Digit Span Test22 studies, 8 as a primary outcome
  • Go/No-Go Task16 studies, 9 as a primary outcome
  • N-Back Task9 studies, 5 as a primary outcome
  • Stroop Color-Word Test8 studies, 2 as a primary outcome
  • Stop-Signal Task6 studies, 3 as a primary outcome
  • Card Sorting Test (Berg)6 studies, 1 as a primary outcome
  • Verbal Fluency4 studies, 2 as a primary outcome
  • Corsi Block-Tapping Test4 studies, 1 as a primary outcome

Conditions

  • ADHD123 studies, 56 as a primary outcome
  • Sleep and sleep disorders6 studies, 0 as a primary outcome
  • Substance use and addiction5 studies, 2 as a primary outcome
  • Autism5 studies, 3 as a primary outcome
  • Brain injury and concussion4 studies, 4 as a primary outcome
  • Anxiety, PTSD and OCD3 studies, 0 as a primary outcome
  • Depression and bipolar disorder2 studies, 1 as a primary outcome
  • Epilepsy2 studies, 2 as a primary outcome

Phases

Participants

Lead sponsor: industry 19, other 104. Interventional 109, observational 14.

As a primary outcomeSecondary or other outcomeThe Continuous Performance Test

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
NCT07900451Start2026PhaseObservationalConditionsADHDParticipants90Lead sponsorOtherStatusRecruitingLibrary tests named
  • Continuous Performance TestSecondarysame day
  • AX Continuous Performance TestWording unclear
NCT07900048Start2026PhaseNot applicableConditionsADHDParticipants100Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Continuous Performance TestPrimary16 weeks
  • Tower PlanningPrimary16 weeks
  • AX Continuous Performance TestWording unclear
NCT07767617Start2026PhaseNot applicableConditionsADHD, Sleep and sleep disordersParticipants150Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Digit Span TestSecondary6 months
  • Go/No-Go TaskSecondary4 weeks
  • Continuous Performance TestSecondary6 months
  • Stop-Signal TaskSecondary4 weeks
  • Delay DiscountingSecondary6 months
  • AX Continuous Performance TestWording unclear
  • Balloon RiskSecondary4 weeks
  • Beads TaskSecondary6 months
NCT07595783Start2024PhaseNot applicableConditionsADHDParticipants40Lead sponsorOtherStatusRecruitingLibrary tests named
  • Continuous Performance TestSecondary7 months
NCT07521449Start2023PhaseNot applicableConditionsADHDParticipants45Lead sponsorOtherStatusCompletedLibrary tests named
  • Stroop Color-Word TestPrimary8 weeks
  • Continuous Performance TestPrimary8 weeks
NCT07419659Start2026PhaseNot applicableConditionsADHDParticipants80Lead sponsorOtherStatusRecruitingLibrary tests named
  • Continuous Performance TestSecondary8 weeks
NCT07364331Start2021PhaseNot applicableConditionsADHDParticipants100Lead sponsorOtherStatusRecruitingLibrary tests named
  • Continuous Performance TestSecondary12 weeks
NCT07348562Start2021PhaseNot applicableConditionsADHDParticipants15Lead sponsorOtherStatusCompletedLibrary tests named
  • Continuous Performance TestSecondary12 weeks
NCT07333339Start2025PhaseObservationalConditionsADHDParticipants174Lead sponsorOtherStatusCompletedLibrary tests named
  • Continuous Performance TestPrimary8 weeks
NCT07228650Start2025PhaseObservationalConditionsADHDParticipants500Lead sponsorOtherStatusRecruitingLibrary tests named
  • Go/No-Go TaskPrimary2 years
  • Continuous Performance TestPrimary2 years
NCT07203092Start2025PhaseNot applicableConditionsADHDParticipants140Lead sponsorOtherStatusRecruitingLibrary tests named
  • Continuous Performance TestPrimary2 weeks
  • AX Continuous Performance TestWording unclear
NCT07180602Start2025PhaseNot applicableConditionsADHDParticipantsNot givenLead sponsorIndustryStatusStopped earlyLibrary tests named
  • Continuous Performance TestPrimary6 months
NCT07147894Start2025PhaseNot applicableConditionsADHDParticipants780Lead sponsorOtherStatusRecruitingLibrary tests named
  • N-Back TaskOther outcome7 months
  • Continuous Performance TestPrimary7 months
  • Eriksen Flanker TaskPrimary7 months
  • Matrix ReasoningSecondary7 months
  • AX Continuous Performance TestWording unclear
  • Letter-Number Sequencing TaskPrimary7 months
NCT07061470Start2027PhasePhase 1/2ConditionsADHD, Sleep and sleep disordersParticipants70Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Go/No-Go TaskSecondary2 weeks
  • Continuous Performance TestSecondary2 weeks
  • Eriksen Flanker TaskSecondary2 weeks
  • Dimensional Change Card SortSecondary2 weeks
NCT07039903Start2025PhaseNot applicableConditionsDepression and bipolar disorder, ADHDParticipants68Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary12 months
  • Stroop Color-Word TestSecondary12 months
  • Verbal FluencySecondary12 months
  • Continuous Performance TestSecondary12 months
  • Category FluencySecondary12 months
  • Card Sorting Test (Berg)Secondary12 months
  • Task Switching TestSecondary12 months
NCT06940089Start2025PhaseNot applicableConditionsADHD, EpilepsyParticipantsNot givenLead sponsorOtherStatusStopped earlyLibrary tests named
  • Verbal FluencyPrimary13 weeks
  • Continuous Performance TestPrimary13 weeks
  • Category FluencyPrimary13 weeks
NCT06743763Start2024PhaseNot applicableConditionsADHDParticipants110Lead sponsorOtherStatusCompletedLibrary tests named
  • Digit Span TestSecondary4 weeks
  • Continuous Performance TestSecondary4 weeks
NCT06657469Start2017PhaseNot applicableConditionsADHDParticipants80Lead sponsorOtherStatusCompletedLibrary tests named
  • Digit Span TestPrimary13 weeks
  • Go/No-Go TaskPrimary13 weeks
  • Continuous Performance TestPrimary13 weeks
  • Matrix ReasoningPrimary13 weeks
  • Corsi Block-Tapping TestPrimary13 weeks
  • Visual Search TestPrimary13 weeks
NCT06632249Start2024PhaseNot applicableConditionsADHDParticipants98Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary4 weeks
  • Symbol CodingSecondary4 weeks
  • Go/No-Go TaskPrimary4 weeks
  • Continuous Performance TestSecondary4 weeks
  • Choice Reaction TimeSecondary4 weeks
  • Corsi Block-Tapping TestSecondary4 weeks
NCT06594536Start2024PhaseNot applicableConditionsADHDParticipants70Lead sponsorOtherStatusRecruitingLibrary tests named
  • Continuous Performance TestSecondary8 weeks
NCT06496685Start2018PhaseNot applicableConditionsADHDParticipants36Lead sponsorOtherStatusCompletedLibrary tests named
  • Continuous Performance TestSecondary14 weeks
NCT06491836Start2024PhaseNot applicableConditionsADHDParticipants50Lead sponsorOtherStatusCompletedLibrary tests named
  • Continuous Performance TestPrimary13 weeks
NCT06369714Start2023PhaseNot applicableConditionsADHDParticipants210Lead sponsorOtherStatusRecruitingLibrary tests named
  • Continuous Performance TestSecondary7 months
  • Cancellation TestSecondary7 months
NCT06256003Start2024PhaseNot applicableConditionsADHDParticipants140Lead sponsorIndustryStatusCompletedLibrary tests named
  • Continuous Performance TestPrimary7 weeks
  • AX Continuous Performance TestWording unclear
NCT06226584Start2024PhaseNot applicableConditionsADHDParticipants30Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Continuous Performance TestPrimary13 weeks

Page 1 of 5

Questions, answered from the data

How many ADHD trials use the Continuous Performance Test?

123 registered ADHD studies on ClinicalTrials.gov name it in an outcome measure, 56 of them in a primary outcome: 34% of the condition's 357 studies with a cognitive outcome, against 4% of all of them. It is the test ADHD trials name most.

Which tests do ADHD trials use with the Continuous Performance Test?

The AX Continuous Performance Test (36 studies), the Digit Span Test (22 studies) and the Go/No-Go Task (16 studies).

When do ADHD trials measure the Continuous Performance Test?

Half of the primary outcomes that name the Continuous Performance Test are measured within 8 weeks of the start, and the middle half from 3 weeks to 13 weeks. 51 primary outcomes give a duration.

How many completed ADHD trials that use the Continuous Performance Test have reported results?

37 of the 77 completed studies that name it, 48%, have reported results: 23 posted them on ClinicalTrials.gov, 22 have a results paper linked to the registry record, and 8 did both. The other 40 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

More on the Continuous Performance Test and ADHD

  • Every cognitive test in ADHD trials: 357 studies
  • The Continuous Performance Test in all clinical trials: 638 studies

The Continuous Performance Test in other conditions

  • Schizophrenia and psychosis78
  • Depression and bipolar disorder73
  • Substance use and addiction53

Other tests in ADHD trials

  • Go/No-Go Task65
  • Stroop Color-Word Test61
  • Digit Span Test58

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.

Run the Continuous Performance Test in your trial

Choose tests with a record in registered trials, and run them in a browser at every site, on the same version each visit.

Start free
ConductCognition

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
© 2026 ConductScience, Inc. Research use only.