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. /Depression and bipolar disorder
  6. /Stroop Color-Word Test

Clinical trials data

Stroop Color-Word Test in depression and bipolar disorder trials: 138 registered studies

Every registered depression and bipolar disorder study on ClinicalTrials.gov that names the Stroop Color-Word 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 depression and bipolar disorder studies name it in an outcome measure
138
Name it in a primary outcome, 28%
38 of 138
Of the condition's 1,247 studies name it, against 12% of all registered studies
11%
Other conditions
Median participants per study
66
By phase
Try the Stroop Color-Word Test

Tests named in the same studies

The library tests that depression and bipolar disorder studies naming the Stroop Color-Word Test name most often beside it.
  1. 1

    Trail Making Test57 studies, 13 as a primary outcome

  2. 2

    Verbal Fluency35 studies, 8 as a primary outcome

  3. 3

    Verbal Learning33 studies, 4 as a primary outcome

  4. 4

    Digit Span Test32 studies, 13 as a primary outcome

  5. 5

    Symbol Coding24 studies, 12 as a primary outcome

  6. 6

    Card Sorting Test (Berg)23 studies, 2 as a primary outcome

  7. 7

    Go/No-Go Task14 studies, 7 as a primary outcome

  8. 8

    Emotional Stroop Task13 studies, 6 as a primary outcome

  9. 9

    Category Fluency12 studies, 5 as a primary outcome

  10. 10

    N-Back Task11 studies, 3 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: 1 studies, 1 with a test as a primary outcome2003: 0 studies, 0 with a test as a primary outcome2004: 0 studies, 0 with a test as a primary outcome2005: 3 studies, 1 with a test as a primary outcome20052006: 1 studies, 0 with a test as a primary outcome2007: 2 studies, 0 with a test as a primary outcome2008: 1 studies, 0 with a test as a primary outcome2009: 1 studies, 0 with a test as a primary outcome2010: 2 studies, 0 with a test as a primary outcome20102011: 3 studies, 0 with a test as a primary outcome2012: 4 studies, 1 with a test as a primary outcome2013: 6 studies, 1 with a test as a primary outcome2014: 7 studies, 0 with a test as a primary outcome2015: 3 studies, 1 with a test as a primary outcome20152016: 3 studies, 0 with a test as a primary outcome2017: 2 studies, 0 with a test as a primary outcome2018: 9 studies, 1 with a test as a primary outcome2019: 13 studies, 4 with a test as a primary outcome2020: 10 studies, 4 with a test as a primary outcome20202021: 12 studies, 5 with a test as a primary outcome2022: 5 studies, 1 with a test as a primary outcome2023: 16 studies, 8 with a test as a primary outcome2024: 12 studies, 6 with a test as a primary outcome2025: 14 studies, 3 with a test as a primary outcome20252026: 7 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
200211
200300
200400
200531
200610
200720
200810
200910
201020
201130
201241
201361
201470
201531
201630
201720
201891
2019134
2020104
2021125
202251
2023168
2024126
2025143
202671

Phases and study sizes

By phase

  • Early phase 13 studies, 0 as a primary outcome
  • Phase 12 studies, 0 as a primary outcome
  • Phase 1/22 studies, 0 as a primary outcome
  • Phase 213 studies, 5 as a primary outcome
  • Phase 2/32 studies, 0 as a primary outcome
  • Phase 35 studies, 0 as a primary outcome
  • Phase 410 studies, 3 as a primary outcome
  • Not applicable90 studies, 27 as a primary outcome
  • Observational11 studies, 3 as a primary outcome

Participants per study

102050100200
  • Phase 272 median, 42 to 168
  • Phase 441 median, 22 to 79
  • Not applicable68 median, 40 to 111
  • Observational80 median, 49 to 112
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 depression and bipolar disorder study that names the Stroop Color-Word Test, by phase
PhaseStudies with a sizeMedianMiddle half
Phase 2117242 to 168
Phase 4104122 to 79
Not applicable886840 to 111
Observational118049 to 112

When depression and bipolar disorder trials measure it

Half of the primary outcomes that name the Stroop Color-Word Test are measured within 8 weeks of the start, and the middle half from 6 weeks to 15 weeks. 35 primary outcomes give a duration.

Latest time point of each outcome

  • Within a day16 outcomes, 5 as a primary outcome
  • Up to 4 weeks18 outcomes, 3 as a primary outcome
  • 1 to 3 months51 outcomes, 17 as a primary outcome
  • 3 to 6 months23 outcomes, 5 as a primary outcome
  • 6 to 12 months14 outcomes, 4 as a primary outcome
  • 1 to 2 years4 outcomes, 1 as a primary outcome
  • Over 2 years4 outcomes, 0 as a primary outcome
  • No duration given8 outcomes, 3 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

130 of the 138 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

  • Recruiting25 studies, 9 as a primary outcome
  • Not yet recruiting7 studies, 0 as a primary outcome
  • Active, not recruiting7 studies, 1 as a primary outcome
  • Completed63 studies, 22 as a primary outcome
  • Stopped early15 studies, 3 as a primary outcome
  • Status unknown21 studies, 3 as a primary outcome

What they test

  • Behavioral42 studies, 15 as a primary outcome
  • Drug35 studies, 9 as a primary outcome
  • Device37 studies, 7 as a primary outcome
  • Dietary supplement5 studies, 0 as a primary outcome
  • Procedure3 studies, 1 as a primary outcome
  • Diagnostic test2 studies, 1 as a primary outcome
  • Biological3 studies, 1 as a primary outcome
  • Combination product1 studies, 0 as a primary outcome
  • Other22 studies, 7 as a primary outcome
  • None given7 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 States38 studies, 12 as a primary outcome
  • China15 studies, 3 as a primary outcome
  • Canada14 studies, 6 as a primary outcome
  • France12 studies, 1 as a primary outcome
  • Germany7 studies, 0 as a primary outcome
  • Brazil6 studies, 3 as a primary outcome
  • Spain6 studies, 0 as a primary outcome
  • Poland4 studies, 1 as a primary outcome
  • Denmark3 studies, 0 as a primary outcome
  • Finland3 studies, 0 as a primary outcome
  • Hong Kong3 studies, 1 as a primary outcome
  • Italy3 studies, 2 as a primary outcome

34 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 depression and bipolar disorder studies that name the Stroop Color-Word Test: 26 of 63, 41%

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

Completed depression and bipolar disorder studies that name the Stroop Color-Word Test and every completed study, by how they reported results
ResultsCompleted depression and bipolar disorder studies that name the Stroop Color-Word TestEvery completed study
Results on ClinicalTrials.gov and a paper8, 13%776, 10%
Results on ClinicalTrials.gov only7, 11%1,139, 14%
A results paper only11, 17%1,711, 22%
Neither37, 59%4,327, 54%

The 138 studies

Filter by phase, sponsor, status, country, intervention, outcome list, size and start year. Each study links to its record on ClinicalTrials.gov.
ConditionDepression and bipolar disorder
TestThe Stroop Color-Word Test

138 studies match. 38 name the Stroop Color-Word Test in a primary outcome. Median size 66 participants. Median time to the primary outcome: 8 weeks.

Loading 138 studies; the filters turn on when they arrive.

By start year
051015202000: 0 studies, 0 naming the Stroop Color-Word Test in a primary outcome20002001: 0 studies, 0 naming the Stroop Color-Word Test in a primary outcome2002: 1 studies, 1 naming the Stroop Color-Word Test in a primary outcome2003: 0 studies, 0 naming the Stroop Color-Word Test in a primary outcome2004: 0 studies, 0 naming the Stroop Color-Word Test in a primary outcome2005: 3 studies, 1 naming the Stroop Color-Word Test in a primary outcome20052006: 1 studies, 0 naming the Stroop Color-Word Test in a primary outcome2007: 2 studies, 0 naming the Stroop Color-Word Test in a primary outcome2008: 1 studies, 0 naming the Stroop Color-Word Test in a primary outcome2009: 1 studies, 0 naming the Stroop Color-Word Test in a primary outcome2010: 2 studies, 0 naming the Stroop Color-Word Test in a primary outcome20102011: 3 studies, 0 naming the Stroop Color-Word Test in a primary outcome2012: 4 studies, 1 naming the Stroop Color-Word Test in a primary outcome2013: 6 studies, 1 naming the Stroop Color-Word Test in a primary outcome2014: 7 studies, 0 naming the Stroop Color-Word Test in a primary outcome2015: 3 studies, 1 naming the Stroop Color-Word Test in a primary outcome20152016: 3 studies, 0 naming the Stroop Color-Word Test in a primary outcome2017: 2 studies, 0 naming the Stroop Color-Word Test in a primary outcome2018: 9 studies, 1 naming the Stroop Color-Word Test in a primary outcome2019: 13 studies, 4 naming the Stroop Color-Word Test in a primary outcome2020: 10 studies, 4 naming the Stroop Color-Word Test in a primary outcome20202021: 12 studies, 5 naming the Stroop Color-Word Test in a primary outcome2022: 5 studies, 1 naming the Stroop Color-Word Test in a primary outcome2023: 16 studies, 8 naming the Stroop Color-Word Test in a primary outcome2024: 12 studies, 6 naming the Stroop Color-Word Test in a primary outcome2025: 14 studies, 3 naming the Stroop Color-Word Test in a primary outcome20252026: 7 studies, 1 naming the Stroop Color-Word Test 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
200211
200300
200400
200531
200610
200720
200810
200910
201020
201130
201241
201361
201470
201531
201630
201720
201891
2019134
2020104
2021125
202251
2023168
2024126
2025143
202671

Library tests named most

  • Stroop Color-Word Test138 studies, 38 as a primary outcome
  • Trail Making Test57 studies, 13 as a primary outcome
  • Verbal Fluency35 studies, 8 as a primary outcome
  • Verbal Learning33 studies, 4 as a primary outcome
  • Digit Span Test32 studies, 13 as a primary outcome
  • Symbol Coding24 studies, 12 as a primary outcome
  • Card Sorting Test (Berg)23 studies, 2 as a primary outcome
  • Go/No-Go Task14 studies, 7 as a primary outcome
  • Emotional Stroop Task13 studies, 6 as a primary outcome
  • Category Fluency12 studies, 5 as a primary outcome

Largest condition groups

  • Depression and bipolar disorder138 studies, 38 as a primary outcome
  • Anxiety, PTSD and OCD27 studies, 9 as a primary outcome
  • Sleep and sleep disorders8 studies, 3 as a primary outcome
  • Pain and fatigue7 studies, 4 as a primary outcome
  • Aging, frailty and exercise5 studies, 1 as a primary outcome
  • Mild cognitive impairment4 studies, 1 as a primary outcome
  • Brain injury and concussion4 studies, 0 as a primary outcome
  • Cancer4 studies, 2 as a primary outcome
  • Obesity and diabetes4 studies, 2 as a primary outcome
  • Schizophrenia and psychosis3 studies, 1 as a primary outcome
  • Substance use and addiction3 studies, 1 as a primary outcome
  • Stroke2 studies, 0 as a primary outcome

Phases

Participants

Lead sponsor: industry 6, NIH 2, other 130. Interventional 127, observational 11.

As a primary outcomeSecondary or other outcomeThe Stroop Color-Word 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
NCT07892326Start2026PhaseNot applicableConditionsDepression and bipolar disorderParticipants200Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestSecondary9 months
NCT07892287Start2027PhaseNot applicableConditionsDepression and bipolar disorderParticipants20Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestSecondary6 days
  • Emotional Stroop TaskSecondary6 days
NCT07755839Start2026PhaseNot applicableConditionsDepression and bipolar disorder, Cancer, Anxiety, PTSD and OCDParticipants60Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary6 months
  • Stroop Color-Word TestSecondary6 months
  • Verbal FluencySecondary6 months
  • Digit Span TestSecondary6 months
  • Cancellation TestSecondary6 months
NCT07735910Start2026PhaseNot applicableConditionsMild cognitive impairment, Depression and bipolar disorder, Sleep and sleep disorders, Anxiety, PTSD and OCDParticipants60Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary2 weeks
  • Stroop Color-Word TestPrimary2 weeks
  • Digit Span TestPrimary2 weeks
NCT07665840Start2025PhaseNot applicableConditionsDepression and bipolar disorder, Sleep and sleep disorders, Anxiety, PTSD and OCDParticipants67Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestSecondary8 weeks
  • Stroop Color-Word TestSecondary8 weeks
NCT07664852Start2026PhasePhase 3ConditionsDepression and bipolar disorderParticipants126Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestOther outcome5 months
  • Stroop Color-Word TestOther outcome5 months
  • Verbal LearningOther outcome5 months
  • Verbal FluencyOther outcome5 months
  • Corsi Block-Tapping TestOther outcome5 months
  • Monetary Incentive DelayOther outcome6 weeks
NCT07652775Start2026PhaseNot applicableConditionsMild cognitive impairment, Depression and bipolar disorderParticipants45Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary5 weeks
  • Stroop Color-Word TestSecondary5 weeks
  • Verbal LearningSecondary5 weeks
  • Digit Span TestSecondary5 weeks
NCT07508215Start2026PhaseNot applicableConditionsDepression and bipolar disorderParticipants120Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary8 weeks
  • Stroop Color-Word TestSecondary8 weeks
  • Verbal LearningSecondary8 weeks
  • Symbol CodingPrimary8 weeks
NCT07350226Start2025PhaseNot applicableConditionsDepression and bipolar disorderParticipants86Lead sponsorOtherStatusActive, not recruitingLibrary tests named
  • Trail Making TestPrimary8 weeks
  • Stroop Color-Word TestPrimary8 weeks
  • Verbal LearningPrimary8 weeks
  • Verbal FluencySecondary8 weeks
  • Digit Span TestPrimary8 weeks
  • Symbol CodingPrimary8 weeks
  • Category FluencyPrimary8 weeks
  • Picture Naming TestPrimary8 weeks
  • Task Switching TestSecondary8 weeks
  • Clock Drawing TaskPrimary8 weeks
  • Complex Figure Copy and RecallSecondary8 weeks
NCT07319143Start2026PhaseNot applicableConditionsDepression and bipolar disorderParticipants90Lead sponsorOtherStatusRecruitingLibrary tests named
  • Stroop Color-Word TestSecondary15 weeks
  • N-Back TaskSecondary15 weeks
  • Monetary Incentive DelaySecondary15 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
NCT07258914Start2024PhaseNot applicableConditionsDepression and bipolar disorder, AutismParticipants25Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary4 weeks
  • Stroop Color-Word TestSecondary4 weeks
  • Go/No-Go TaskSecondary4 weeks
NCT07247370Start2025PhasePhase 1/2ConditionsDepression and bipolar disorder, Substance use and addictionParticipants20Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestOther outcome10 weeks
  • Card Sorting Test (Berg)Other outcome5 months
  • Task Switching TestOther outcome5 months
NCT07098533Start2023PhaseNot applicableConditionsDepression and bipolar disorder, Aging, frailty and exerciseParticipants70Lead sponsorOtherStatusCompletedLibrary tests named
  • Stroop Color-Word TestSecondary8 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
NCT06922409Start2025PhaseNot applicableConditionsStroke, Depression and bipolar disorder, Sleep and sleep disorders, Pain and fatigueParticipants45Lead sponsorOtherStatusRecruitingLibrary tests named
  • Stroop Color-Word TestSecondary1 week
  • Verbal FluencySecondary1 week
  • Category FluencySecondary1 week
NCT06913309Start2025PhaseNot applicableConditionsDepression and bipolar disorderParticipants168Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary4 weeks
  • Stroop Color-Word TestSecondary4 weeks
  • Verbal LearningSecondary4 weeks
  • Continuous Performance TestSecondary4 weeks
NCT06897553Start2024PhaseNot applicableConditionsBrain injury and concussion, Depression and bipolar disorder, COVID-19 and long COVID, Anxiety, PTSD and OCDParticipants44Lead sponsorOtherStatusRecruitingLibrary tests named
  • Stroop Color-Word TestSecondary8 weeks
  • Verbal FluencySecondary8 weeks
NCT06895863Start2025PhaseNot applicableConditionsDepression and bipolar disorderParticipants78Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary4 weeks
  • Stroop Color-Word TestSecondary4 weeks
NCT06813313Start2025PhaseNot applicableConditionsDepression and bipolar disorderParticipants108Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary5 days
  • Stroop Color-Word TestSecondary5 days
  • Verbal FluencySecondary5 days
  • Digit Span TestSecondary5 days
  • N-Back TaskSecondary5 days
  • Go/No-Go TaskSecondary5 days
  • Card Sorting Test (Berg)Secondary5 days
NCT06777693Start2024PhaseNot applicableConditionsDepression and bipolar disorder, Anxiety, PTSD and OCDParticipants24Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary
  • Stroop Color-Word TestPrimary
NCT06758206Start2025PhaseNot applicableConditionsDepression and bipolar disorderParticipants64Lead sponsorOtherStatusCompletedLibrary tests named
  • Stroop Color-Word TestPrimary9 months
  • Digit Span TestPrimary9 months
NCT06714643Start2025PhaseNot applicableConditionsDepression and bipolar disorderParticipants105Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Stroop Color-Word TestSecondary6 months
NCT06708026Start2025PhaseNot applicableConditionsDepression and bipolar disorderParticipants46Lead sponsorOtherStatusCompletedLibrary tests named
  • Stroop Color-Word TestSecondary9 weeks
  • Digit Span TestSecondary9 weeks
  • Symbol CodingSecondary9 weeks
NCT06665633Start2021PhasePhase 1ConditionsBrain injury and concussion, Depression and bipolar disorderParticipants40Lead sponsorOtherStatusCompletedLibrary tests named
  • Stroop Color-Word TestSecondary12 months
  • Simple Reaction TimeSecondary12 months

Page 1 of 6

Questions, answered from the data

How many depression and bipolar disorder trials use the Stroop Color-Word Test?

138 registered depression and bipolar disorder studies on ClinicalTrials.gov name it in an outcome measure, 38 of them in a primary outcome: 11% of the condition's 1,247 studies with a cognitive outcome, against 12% of all of them. It is the 6th most named test in depression and bipolar disorder trials.

Which tests do depression and bipolar disorder trials use with the Stroop Color-Word Test?

The Trail Making Test (57 studies), Verbal Fluency (35 studies) and Verbal Learning (33 studies).

How many participants do phase 2 depression and bipolar disorder trials that use the Stroop Color-Word Test enroll?

Half of the phase 2 studies that name it enroll 72 participants or fewer, and the middle half enroll 42 to 168. 11 of them give a size.

When do depression and bipolar disorder trials measure the Stroop Color-Word Test?

Half of the primary outcomes that name the Stroop Color-Word Test are measured within 8 weeks of the start, and the middle half from 6 weeks to 15 weeks. 35 primary outcomes give a duration.

How many completed depression and bipolar disorder trials that use the Stroop Color-Word Test have reported results?

26 of the 63 completed studies that name it, 41%, have reported results: 15 posted them on ClinicalTrials.gov, 19 have a results paper linked to the registry record, and 8 did both. The other 37 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

More on the Stroop Color-Word Test and depression and bipolar disorder

  • Every cognitive test in depression and bipolar disorder trials: 1,247 studies
  • The Stroop Color-Word Test in all clinical trials: 1,929 studies

The Stroop Color-Word Test in other conditions

  • Aging, frailty and exercise230
  • Mild cognitive impairment126
  • Parkinson's disease126
  • Dementia and Alzheimer's116
  • Pain and fatigue114
  • Stroke105
  • Obesity and diabetes103
  • Healthy volunteers98
  • Sleep and sleep disorders89
  • Cardiovascular disease81
  • Anxiety, PTSD and OCD79
  • Substance use and addiction75
  • Cancer65
  • ADHD61
  • Brain injury and concussion59
  • Multiple sclerosis56

Other tests in depression and bipolar disorder trials

  • Trail Making Test204
  • Verbal Learning178
  • Verbal Fluency154
  • Digit Span Test143
  • Symbol Coding143
  • Go/No-Go Task79
  • N-Back Task79
  • Continuous Performance Test73
  • Card Sorting Test (Berg)65

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 Stroop Color-Word 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.