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    1. Verbal Fluency TestGradeA
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    Grade, length

    • Reaction Time StudyGradeA7 min
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    • Older Adult Executive SpeedGradeA20 min
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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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  5. /Simple Reaction Time

Clinical trials data

Simple Reaction Time in clinical trials: 210 registered studies

Every registered study on ClinicalTrials.gov that names Simple Reaction Time in an outcome measure: the conditions it is used in, how often it is a primary outcome, the tests it is named with, and how large the studies are.

Registered studies name it in an outcome measure
210
Name it in a primary outcome, 40%
85 of 210
Against similar tests
Of studies started 2021 to 2025 name it, against 1.1% in 2016 to 2020
1.0%
By year
Median participants per study
55
By phase
Try Simple Reaction TimeTry the Quick Circles Game

The conditions it is used in

Each study counted once in each condition group it falls in.

  1. Pain and fatigue22 studies, 11 as a primary outcome

  2. Healthy volunteers20 studies, 8 as a primary outcome

  3. Depression and bipolar disorder19 studies, 4 as a primary outcome

  4. Brain injury and concussion15 studies, 9 as a primary outcome

  5. Sleep and sleep disorders15 studies, 4 as a primary outcome

  6. Parkinson's disease14 studies, 6 as a primary outcome

  7. Aging, frailty and exercise14 studies, 3 as a primary outcome

  8. Dementia and Alzheimer's13 studies, 7 as a primary outcome

  9. Anxiety, PTSD and OCD13 studies, 3 as a primary outcome

  10. Substance use and addiction7 studies, 1 as a primary outcome

  11. COVID-19 and long COVID7 studies, 2 as a primary outcome

  12. Stroke5 studies, 2 as a primary outcome

  13. Multiple sclerosis5 studies, 0 as a primary outcome

  14. Mild cognitive impairment4 studies, 2 as a primary outcome

  15. Obesity and diabetes4 studies, 1 as a primary outcome

  16. Epilepsy4 studies, 0 as a primary outcome

  17. Cognitive impairment and decline3 studies, 2 as a primary outcome

  18. Cancer2 studies, 1 as a primary outcome

  19. Cardiovascular disease2 studies, 0 as a primary outcome

  20. Schizophrenia and psychosis1 study, 0 as a primary outcome

  21. ADHD1 study, 1 as a primary outcome

  22. Delirium, surgery and intensive care1 study, 0 as a primary outcome

  23. Huntington's disease1 study, 1 as a primary outcome

  24. Other conditions56 studies, 24 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

How often it is a primary outcome

Simple Reaction Time is a primary outcome in 40% of its studies. Across the 11 processing speed tests with a page here, the median is 42%.

  1. Motor Sequence Task53% of 30 studies

  2. Serial Reaction Time48% of 27 studies

  3. Arithmetic Fluency Task47% of 101 studies

  4. Mirror Tracing Task43% of 23 studies

  5. Symbol Scan Task42% of 129 studies

  6. Paced Visual Serial Addition Test42% of 337 studies

  7. Simple Reaction Time40% of 210 studies

  8. Finger Tapping Task38% of 144 studies

  9. Pattern and Letter Comparison35% of 147 studies

  10. Symbol Coding31% of 1,457 studies

  11. Trail Making Test31% of 2,293 studies

Studies by start year

1.0% of the registered studies that started in 2021 to 2025 name it, against 1.1% of those that started in 2016 to 2020. 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: 0 studies, 0 with a test as a primary outcome2004: 1 studies, 0 with a test as a primary outcome2005: 0 studies, 0 with a test as a primary outcome20052006: 5 studies, 3 with a test as a primary outcome2007: 3 studies, 2 with a test as a primary outcome2008: 4 studies, 2 with a test as a primary outcome2009: 5 studies, 3 with a test as a primary outcome2010: 9 studies, 6 with a test as a primary outcome20102011: 11 studies, 3 with a test as a primary outcome2012: 10 studies, 4 with a test as a primary outcome2013: 7 studies, 2 with a test as a primary outcome2014: 9 studies, 4 with a test as a primary outcome2015: 8 studies, 3 with a test as a primary outcome20152016: 12 studies, 5 with a test as a primary outcome2017: 11 studies, 5 with a test as a primary outcome2018: 8 studies, 4 with a test as a primary outcome2019: 10 studies, 4 with a test as a primary outcome2020: 7 studies, 3 with a test as a primary outcome20202021: 16 studies, 6 with a test as a primary outcome2022: 10 studies, 6 with a test as a primary outcome2023: 13 studies, 4 with a test as a primary outcome2024: 12 studies, 5 with a test as a primary outcome2025: 19 studies, 4 with a test as a primary outcome20252026: 19 studies, 7 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
200300
200410
200500
200653
200732
200842
200953
201096
2011113
2012104
201372
201494
201583
2016125
2017115
201884
2019104
202073
2021166
2022106
2023134
2024125
2025194
2026197

Phases and study sizes

By phase

  • Early phase 12 studies, 1 as a primary outcome
  • Phase 124 studies, 11 as a primary outcome
  • Phase 1/24 studies, 1 as a primary outcome
  • Phase 228 studies, 5 as a primary outcome
  • Phase 313 studies, 2 as a primary outcome
  • Phase 415 studies, 8 as a primary outcome
  • Not applicable99 studies, 45 as a primary outcome
  • Observational25 studies, 12 as a primary outcome

Participants per study

102050100200500
  • Phase 128 median, 18 to 45
  • Phase 298 median, 41 to 139
  • Phase 3295 median, 101 to 605
  • Phase 440 median, 22 to 63
  • Not applicable46 median, 30 to 80
  • Observational66 median, 54 to 216
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 study that names Simple Reaction Time, by phase
PhaseStudies with a sizeMedianMiddle half
Phase 1242818 to 45
Phase 2269841 to 139
Phase 313295101 to 605
Phase 4154022 to 63
Not applicable984630 to 80
Observational246654 to 216

When trials measure it

Half of the primary outcomes that name Simple Reaction Time are measured within 1 week of the start, and the middle half from the first day to 8 weeks. 80 primary outcomes give a duration.

Latest time point of each outcome

  • Within a day60 outcomes, 33 as a primary outcome
  • Up to 4 weeks39 outcomes, 20 as a primary outcome
  • 1 to 3 months55 outcomes, 15 as a primary outcome
  • 3 to 6 months19 outcomes, 4 as a primary outcome
  • 6 to 12 months14 outcomes, 4 as a primary outcome
  • 1 to 2 years2 outcomes, 1 as a primary outcome
  • Over 2 years9 outcomes, 3 as a primary outcome
  • No duration given12 outcomes, 5 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

198 of the 210 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

  • Recruiting25 studies, 7 as a primary outcome
  • Not yet recruiting10 studies, 4 as a primary outcome
  • Active, not recruiting5 studies, 0 as a primary outcome
  • Completed134 studies, 60 as a primary outcome
  • Stopped early15 studies, 6 as a primary outcome
  • Status unknown21 studies, 8 as a primary outcome

What they test

  • Behavioral27 studies, 8 as a primary outcome
  • Drug78 studies, 23 as a primary outcome
  • Device32 studies, 15 as a primary outcome
  • Dietary supplement28 studies, 15 as a primary outcome
  • Procedure1 studies, 1 as a primary outcome
  • Diagnostic test1 studies, 0 as a primary outcome
  • Biological3 studies, 1 as a primary outcome
  • Combination product1 studies, 0 as a primary outcome
  • Other64 studies, 26 as a primary outcome
  • None given9 studies, 4 as a primary outcome

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

Where their sites are

  • United States70 studies, 26 as a primary outcome
  • United Kingdom39 studies, 16 as a primary outcome
  • France15 studies, 8 as a primary outcome
  • Spain15 studies, 5 as a primary outcome
  • Germany14 studies, 3 as a primary outcome
  • Türkiye14 studies, 8 as a primary outcome
  • Canada13 studies, 5 as a primary outcome
  • Poland12 studies, 3 as a primary outcome
  • Belgium11 studies, 3 as a primary outcome
  • Denmark11 studies, 0 as a primary outcome
  • Australia8 studies, 2 as a primary outcome
  • Italy7 studies, 0 as a primary outcome

54 countries in all. A study with sites in several counts in each; 21 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 studies that name Simple Reaction Time: 64 of 134, 48%

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

Completed studies that name Simple Reaction Time and every completed study, by how they reported results
ResultsCompleted studies that name Simple Reaction TimeEvery completed study
Results on ClinicalTrials.gov and a paper23, 17%776, 10%
Results on ClinicalTrials.gov only19, 14%1,139, 14%
A results paper only22, 16%1,711, 22%
Neither70, 52%4,327, 54%

Tests named in the same studies

The library tests that studies naming Simple Reaction Time name most often beside it.
  1. 1

    Choice Reaction Time85 studies, 40 as a primary outcome

  2. 2

    Stroop Color-Word Test31 studies, 13 as a primary outcome

  3. 3

    Trail Making Test25 studies, 1 as a primary outcome

  4. 4

    Go/No-Go Task23 studies, 13 as a primary outcome

  5. 5

    Symbol Coding20 studies, 7 as a primary outcome

  6. 6

    Verbal Learning20 studies, 7 as a primary outcome

  7. 7

    Rapid Visual Information Processing19 studies, 8 as a primary outcome

  8. 8

    Delayed Recall Module18 studies, 7 as a primary outcome

  9. 9

    Verbal Fluency17 studies, 5 as a primary outcome

  10. 10

    Psychomotor Vigilance Task13 studies, 7 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

Compared over time

Studies per start year for Simple Reaction Time and the tests named with it most. Add or remove tests to compare.
Simple Reaction Time209 studies, 2000 to 2026
01252502000201020202026
Choice Reaction Time269 studies, 2000 to 2026
01252502000201020202026
Stroop Color-Word Test1,922 studies, 2000 to 2026
01252502000201020202026
Trail Making Test2,281 studies, 2000 to 2026
01252502000201020202026

The panel's testThe other tests chosenEvery panel has the same scale. 2026 is partly planned starts.

Show as a table
Registered studies per start year that name each test
Start yearSimple Reaction TimeChoice Reaction TimeStroop Color-Word TestTrail Making Test
20000032
20010030
20020053
20030028
200412810
2005031114
200655614
2007361321
2008451517
2009531629
20109112932
20111183147
201210113244
2013774260
20149156466
20158146785
2016121285103
2017111779122
2018810103117
20191010119155
20207999122
20211622151172
20221017168188
20231318198228
20241218182211
20251924198210
20261922193201

Explore the 210 studies

Filter by condition, phase, sponsor, status, country, intervention, outcome list, size and start year. Each study links to its record on ClinicalTrials.gov.
TestSimple Reaction Time

210 studies match. 85 name Simple Reaction Time in a primary outcome. Median size 55 participants. Median time to the primary outcome: 1 week.

Loading 210 studies; the filters turn on when they arrive.

By start year
051015202000: 0 studies, 0 naming Simple Reaction Time in a primary outcome20002001: 0 studies, 0 naming Simple Reaction Time in a primary outcome2002: 0 studies, 0 naming Simple Reaction Time in a primary outcome2003: 0 studies, 0 naming Simple Reaction Time in a primary outcome2004: 1 studies, 0 naming Simple Reaction Time in a primary outcome2005: 0 studies, 0 naming Simple Reaction Time in a primary outcome20052006: 5 studies, 3 naming Simple Reaction Time in a primary outcome2007: 3 studies, 2 naming Simple Reaction Time in a primary outcome2008: 4 studies, 2 naming Simple Reaction Time in a primary outcome2009: 5 studies, 3 naming Simple Reaction Time in a primary outcome2010: 9 studies, 6 naming Simple Reaction Time in a primary outcome20102011: 11 studies, 3 naming Simple Reaction Time in a primary outcome2012: 10 studies, 4 naming Simple Reaction Time in a primary outcome2013: 7 studies, 2 naming Simple Reaction Time in a primary outcome2014: 9 studies, 4 naming Simple Reaction Time in a primary outcome2015: 8 studies, 3 naming Simple Reaction Time in a primary outcome20152016: 12 studies, 5 naming Simple Reaction Time in a primary outcome2017: 11 studies, 5 naming Simple Reaction Time in a primary outcome2018: 8 studies, 4 naming Simple Reaction Time in a primary outcome2019: 10 studies, 4 naming Simple Reaction Time in a primary outcome2020: 7 studies, 3 naming Simple Reaction Time in a primary outcome20202021: 16 studies, 6 naming Simple Reaction Time in a primary outcome2022: 10 studies, 6 naming Simple Reaction Time in a primary outcome2023: 13 studies, 4 naming Simple Reaction Time in a primary outcome2024: 12 studies, 5 naming Simple Reaction Time in a primary outcome2025: 19 studies, 4 naming Simple Reaction Time in a primary outcome20252026: 19 studies, 7 naming Simple Reaction Time 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
200300
200410
200500
200653
200732
200842
200953
201096
2011113
2012104
201372
201494
201583
2016125
2017115
201884
2019104
202073
2021166
2022106
2023134
2024125
2025194
2026197

Library tests named most

  • Simple Reaction Time210 studies, 85 as a primary outcome
  • Choice Reaction Time85 studies, 40 as a primary outcome
  • Stroop Color-Word Test31 studies, 13 as a primary outcome
  • Trail Making Test25 studies, 1 as a primary outcome
  • Go/No-Go Task23 studies, 13 as a primary outcome
  • Symbol Coding20 studies, 7 as a primary outcome
  • Verbal Learning20 studies, 7 as a primary outcome
  • Rapid Visual Information Processing19 studies, 8 as a primary outcome
  • Delayed Recall Module18 studies, 7 as a primary outcome
  • Verbal Fluency17 studies, 5 as a primary outcome

Largest condition groups

Phases

Participants

Lead sponsor: industry 53, NIH 1, other 156. Interventional 185, observational 25.

As a primary outcomeSecondary or other outcomeSimple Reaction Time

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
NCT07897175Start2026PhaseNot applicableConditionsHealthy volunteersParticipants54Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestPrimary1 week
  • Choice Reaction TimePrimary1 week
  • Simple Reaction TimePrimary1 week
  • Arithmetic Fluency TaskPrimary1 week
NCT07895797Start2026PhaseNot applicableConditionsBrain injury and concussionParticipants38Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Simple Reaction TimeSecondary
NCT07862192Start2025PhaseNot applicableConditionsOther conditionsParticipants48Lead sponsorOtherStatusCompletedLibrary tests named
  • Simple Reaction TimePrimary12 weeks
NCT07858240Start2026PhaseObservationalConditionsOther conditionsParticipants28Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Simple Reaction TimeSecondary2 years
  • Duration Discrimination TaskSecondary2 years
  • Temporal Order Judgment TaskSecondary2 years
NCT07833748Start2026PhaseNot applicableConditionsParkinson's diseaseParticipants12Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary13 weeks
  • Symbol CodingSecondary13 weeks
  • Choice Reaction TimeSecondary13 weeks
  • Simple Reaction TimeSecondary13 weeks
  • Finger Tapping TaskSecondary13 weeks
NCT07825948Start2026PhaseNot applicableConditionsAging, frailty and exerciseParticipants299Lead sponsorOtherStatusCompletedLibrary tests named
  • Choice Reaction TimeSecondary8 weeks
  • Simple Reaction TimeSecondary8 weeks
NCT07761611Start2026PhaseNot applicableConditionsPain and fatigueParticipants118Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Psychomotor Vigilance TaskPrimary3 weeks
  • Simple Reaction TimePrimary3 weeks
NCT07761182Start2026PhaseObservationalConditionsOther conditionsParticipants60Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary12 months
  • Verbal LearningSecondary12 months
  • Digit Span TestSecondary12 months
  • Category FluencySecondary12 months
  • Simple Reaction TimeSecondary12 months
  • Emoji Emotion RecognitionSecondary12 months
NCT07752329Start2026PhaseNot applicableConditionsPain and fatigueParticipants70Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestSecondary6 weeks
  • Choice Reaction TimePrimary6 weeks
  • Simple Reaction TimePrimary6 weeks
  • Rapid Visual Information ProcessingSecondary6 weeks
  • Delayed Recall ModuleSecondary6 weeks
  • Finger Tapping TaskSecondary6 weeks
  • Fitts Pointing TaskSecondary6 weeks
  • Multiple Object TrackingSecondary6 weeks
NCT07752316Start2024PhaseNot applicableConditionsMild cognitive impairmentParticipants30Lead sponsorOtherStatusCompletedLibrary tests named
  • Tower PlanningSecondary2 weeks
  • Simple Reaction TimeSecondary2 weeks
  • Corsi Block-Tapping TestSecondary2 weeks
NCT07748429Start2027PhaseNot applicableConditionsOther conditionsParticipants80Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Psychomotor Vigilance TaskPrimary
  • Eriksen Flanker TaskPrimary
  • Simple Reaction TimeSecondary
NCT07702929Start2026PhaseNot applicableConditionsParkinson's diseaseParticipants48Lead sponsorOtherStatusRecruitingLibrary tests named
  • Stop-Signal TaskPrimary4 weeks
  • Choice Reaction TimePrimary4 weeks
  • Simple Reaction TimePrimary4 weeks
NCT07655167Start2022PhaseNot applicableConditionsOther conditionsParticipants50Lead sponsorOtherStatusCompletedLibrary tests named
  • Simple Reaction TimePrimary6 months
NCT07652424Start2025PhaseNot applicableConditionsAging, frailty and exercise, Sleep and sleep disordersParticipants60Lead sponsorOtherStatusCompletedLibrary tests named
  • Choice Reaction TimeSecondary
  • Simple Reaction TimeSecondary
NCT07606651Start2026PhaseObservationalConditionsBrain injury and concussionParticipants250Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Simple Reaction TimeSecondary5 years
NCT07567053Start2026PhaseNot applicableConditionsOther conditionsParticipants60Lead sponsorOtherStatusRecruitingLibrary tests named
  • Simple Reaction TimeOther outcome4 weeks
  • Finger Tapping TaskOther outcome4 weeks
  • Pursuit Tracking TestOther outcome4 weeks
  • Fitts Pointing TaskOther outcome4 weeks
NCT07511439Start2026PhasePhase 4ConditionsHealthy volunteersParticipants60Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestOther outcome12 months
  • Verbal FluencyOther outcome12 months
  • Symbol CodingOther outcome12 months
  • Complex Figure Copy and RecallOther outcome12 months
  • Simple Reaction TimeOther outcome12 months
  • Emoji Emotion RecognitionOther outcome12 months
  • Letter-Number Sequencing TaskOther outcome12 months
  • Probabilistic Reversal LearningOther outcome12 months
  • Intra/Extra Dimensional Set ShiftOther outcome12 months
NCT07503106Start2026PhaseObservationalConditionsOther conditionsParticipants30Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Simple Reaction TimePrimarysame day
NCT07468032Start2026PhaseNot applicableConditionsStrokeParticipants80Lead sponsorOtherStatusRecruitingLibrary tests named
  • Simple Reaction TimePrimarysame day
NCT07433153Start2026PhaseNot applicableConditionsAging, frailty and exerciseParticipants36Lead sponsorOtherStatusRecruitingLibrary tests named
  • Simple Reaction TimeSecondary9 weeks
NCT07427485Start2025PhaseNot applicableConditionsSchizophrenia and psychosisParticipants40Lead sponsorOtherStatusCompleted

Paper

Library tests named
  • Trail Making TestSecondary12 weeks
  • Verbal FluencySecondary12 weeks
  • Symbol CodingSecondary12 weeks
  • Category FluencySecondary12 weeks
  • Choice Reaction TimeSecondary12 weeks
  • Simple Reaction TimeSecondary12 weeks
NCT07400614Start2026PhaseNot applicableConditionsOther conditionsParticipants48Lead sponsorIndustryStatusCompletedLibrary tests named
  • Simple Reaction TimeSecondarysame day
  • Rapid Visual Information ProcessingSecondarysame day
NCT07399847Start2026PhaseObservationalConditionsSleep and sleep disordersParticipants30Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Eriksen Flanker TaskSecondary5 weeks
  • Simple Reaction TimeSecondary5 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
NCT07304375Start2025PhaseNot applicableConditionsMultiple sclerosis, Aging, frailty and exercise, Sleep and sleep disordersParticipants20Lead sponsorOtherStatusRecruitingLibrary tests named
  • Simple Reaction TimeOther outcomesame day

Page 1 of 9

Questions, answered from the data

How many clinical trials use Simple Reaction Time?

210 registered studies on ClinicalTrials.gov name it in an outcome measure, 85 of them in a primary outcome.

In which conditions do trials use Simple Reaction Time?

Most often in pain and fatigue (22), healthy volunteers (20) and depression and bipolar disorder (19).

Do new trials use Simple Reaction Time more or less?

1.0% of the studies that started in 2021 to 2025 name it, against 1.1% of those that started in 2016 to 2020: a share 8% smaller.

Which tests do trials use with Simple Reaction Time?

Choice Reaction Time (85 studies), the Stroop Color-Word Test (31 studies) and the Trail Making Test (25 studies).

How many participants do phase 2 trials that use Simple Reaction Time enroll?

Half of the phase 2 studies that name it enroll 98 participants or fewer, and the middle half enroll 41 to 139. 26 of them give a size.

When do trials measure Simple Reaction Time?

Half of the primary outcomes that name Simple Reaction Time are measured within 1 week of the start, and the middle half from the first day to 8 weeks. 80 primary outcomes give a duration.

How many completed trials that use Simple Reaction Time have reported results?

64 of the 134 completed studies that name it, 48%, have reported results: 42 posted them on ClinicalTrials.gov, 45 have a results paper linked to the registry record, and 23 did both. The other 70 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

More on tests in clinical trials

  • Simple Reaction Time: what it measures, its scores, and a version to try
  • Quick Circles Game: what it measures, its scores, and a version to try
  • All 101 tests in clinical trials
  • Cognitive tests by condition
  • Every registered study, 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.

The census counts Simple Reaction Time and Quick Circles Game as one test family, so this page counts their studies together: 210 studies.

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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
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