Clinical trials data

Verbal Fluency in mild cognitive impairment trials: 177 registered studies

Every registered mild cognitive impairment study on ClinicalTrials.gov that names Verbal Fluency 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 mild cognitive impairment studies name it in an outcome measure: 177
Name it in a primary outcome, 40%: 70 of 177
Of the condition's 859 studies name it, against 11% of all registered studies: 21%; Other conditions
Median participants per study: 66; By phase

Try Verbal Fluency

Tests named in the same studies

The library tests that mild cognitive impairment studies naming Verbal Fluency name most often beside it.

1
Trail Making Test86 studies, 27 as a primary outcome
2
Verbal Learning69 studies, 37 as a primary outcome
3
Digit Span Test67 studies, 27 as a primary outcome
4
Category Fluency48 studies, 20 as a primary outcome
5
Stroop Color-Word Test48 studies, 17 as a primary outcome
6
Picture Naming Test45 studies, 16 as a primary outcome
7
Symbol Coding34 studies, 16 as a primary outcome
8
Clock Drawing Task26 studies, 14 as a primary outcome
9
Short Story Recall22 studies, 12 as a primary outcome
10
Complex Figure Copy and Recall17 studies, 6 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.

A test as a primary outcomeOnly in secondary or other outcomes

Show as a table

Registered studies by start year
Start year	Studies	A test as a primary outcome
2000	0	0
2001	0	0
2002	0	0
2003	0	0
2004	0	0
2005	0	0
2006	1	0
2007	0	0
2008	1	1
2009	1	0
2010	4	0
2011	3	1
2012	4	2
2013	1	0
2014	5	3
2015	7	4
2016	4	1
2017	10	4
2018	13	6
2019	12	4
2020	16	7
2021	15	7
2022	13	2
2023	18	10
2024	20	8
2025	20	7
2026	9	3

Phases and study sizes

By phase

Early phase 12 studies, 1 as a primary outcome
Phase 13 studies, 1 as a primary outcome
Phase 1/22 studies, 1 as a primary outcome
Phase 213 studies, 6 as a primary outcome
Phase 32 studies, 1 as a primary outcome
Phase 41 studies, 1 as a primary outcome
Not applicable136 studies, 50 as a primary outcome
Observational18 studies, 9 as a primary outcome

Participants per study

Phase 299 median, 55 to 151
Not applicable60 median, 40 to 107
Observational149 median, 70 to 232

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.

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Participants per mild cognitive impairment study that names Verbal Fluency, by phase
Phase	Studies with a size	Median	Middle half
Phase 2	12	99	55 to 151
Not applicable	136	60	40 to 107
Observational	18	149	70 to 232

When mild cognitive impairment trials measure it

Half of the primary outcomes that name Verbal Fluency are measured within 5 months of the start, and the middle half from 10 weeks to 9 months. 65 primary outcomes give a duration.

Latest time point of each outcome

Within a day11 outcomes, 4 as a primary outcome
Up to 4 weeks17 outcomes, 4 as a primary outcome
1 to 3 months45 outcomes, 21 as a primary outcome
3 to 6 months36 outcomes, 16 as a primary outcome
6 to 12 months38 outcomes, 11 as a primary outcome
1 to 2 years12 outcomes, 7 as a primary outcome
Over 2 years7 outcomes, 2 as a primary outcome
No duration given11 outcomes, 5 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

166 of the 177 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

Recruiting34 studies, 11 as a primary outcome
Not yet recruiting9 studies, 3 as a primary outcome
Active, not recruiting6 studies, 4 as a primary outcome
Completed76 studies, 28 as a primary outcome
Stopped early13 studies, 6 as a primary outcome
Status unknown39 studies, 18 as a primary outcome

What they test

Behavioral64 studies, 24 as a primary outcome
Drug18 studies, 6 as a primary outcome
Device46 studies, 16 as a primary outcome
Dietary supplement18 studies, 7 as a primary outcome
Procedure5 studies, 1 as a primary outcome
Diagnostic test3 studies, 2 as a primary outcome
Biological2 studies, 2 as a primary outcome
Radiation2 studies, 1 as a primary outcome
Combination product2 studies, 1 as a primary outcome
Other44 studies, 21 as a primary outcome
None given4 studies, 3 as a primary outcome

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

34 countries in all. A study with sites in several counts in each; 12 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 mild cognitive impairment studies that name Verbal Fluency: 44 of 76, 58%

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

Completed mild cognitive impairment studies that name Verbal Fluency and every completed study, by how they reported results
Results	Completed mild cognitive impairment studies that name Verbal Fluency	Every completed study
Results on ClinicalTrials.gov and a paper	12, 16%	776, 10%
Results on ClinicalTrials.gov only	12, 16%	1,139, 14%
A results paper only	20, 26%	1,711, 22%
Neither	32, 42%	4,327, 54%

The 177 studies

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

177 studies match. 70 name Verbal Fluency in a primary outcome. Median size 66 participants. Median time to the primary outcome: 5 months.

Loading 177 studies; the filters turn on when they arrive.

By start year

2026 is partly planned starts.

Show as a table

Matching studies by start year
Start year	Studies	As a primary outcome
2000	0	0
2001	0	0
2002	0	0
2003	0	0
2004	0	0
2005	0	0
2006	1	0
2007	0	0
2008	1	1
2009	1	0
2010	4	0
2011	3	1
2012	4	2
2013	1	0
2014	5	3
2015	7	4
2016	4	1
2017	10	4
2018	13	6
2019	12	4
2020	16	7
2021	15	7
2022	13	2
2023	18	10
2024	20	8
2025	20	7
2026	9	3

Library tests named most

Largest condition groups

Mild cognitive impairment177 studies, 70 as a primary outcome
Dementia and Alzheimer's65 studies, 29 as a primary outcome
Aging, frailty and exercise16 studies, 6 as a primary outcome
Parkinson's disease11 studies, 2 as a primary outcome
Healthy volunteers5 studies, 1 as a primary outcome
Sleep and sleep disorders5 studies, 2 as a primary outcome
Cardiovascular disease4 studies, 2 as a primary outcome
Depression and bipolar disorder3 studies, 1 as a primary outcome
Cancer3 studies, 0 as a primary outcome
Obesity and diabetes3 studies, 3 as a primary outcome
Brain injury and concussion2 studies, 1 as a primary outcome
Stroke1 study, 1 as a primary outcome

Phases

Participants

Lead sponsor: industry 15, other 162. Interventional 159, observational 18.

As a primary outcomeSecondary or other outcomeVerbal Fluency

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.
Study	Start	Phase	Conditions	Participants	Lead sponsor	Status	Library tests named, with the latest time point
NCT07883148	Start2024	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants52	Lead sponsorOther	StatusCompleted	Library tests named Trail Making TestSecondary8 months Verbal LearningSecondary8 months Verbal FluencySecondary8 months Digit Span TestSecondary8 months Complex Figure Copy and RecallSecondary8 months
NCT07842146	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants60	Lead sponsorOther	StatusRecruiting	Library tests named Verbal FluencySecondary11 months Symbol CodingSecondary11 months Category FluencySecondary11 months Delayed Recall ModuleSecondary11 months
NCT07733726	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment, Aging, frailty and exercise	Participants66	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary7 months Verbal FluencySecondary7 months
NCT07731334	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants384	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary12 months Stroop Color-Word TestSecondary12 months Verbal LearningSecondary12 months Verbal FluencySecondary12 months Digit Span TestSecondary12 months Complex Figure Copy and RecallSecondary12 months Corsi Block-Tapping TestSecondary12 months Oddball Target DetectionSecondary
NCT07651085	Start2024	PhaseObservational	ConditionsDementia and Alzheimer's, Mild cognitive impairment, Parkinson's disease, Sleep and sleep disorders	Participants65	Lead sponsorOther	StatusActive, not recruiting	Library tests named Verbal LearningPrimary Verbal FluencyPrimary Category FluencyPrimary Clock Drawing TaskPrimary
NCT07608510	Start2026	PhaseObservational	ConditionsMild cognitive impairment	Participants150	Lead sponsorOther	StatusNot yet recruiting	Library tests named Stroop Color-Word TestSecondary Verbal LearningSecondary Verbal FluencySecondary Picture Naming TestSecondary
NCT07596940	Start2023	PhaseNot applicable	ConditionsMild cognitive impairment	Participants9	Lead sponsorOther	StatusCompleted	Library tests named Verbal LearningPrimary4 weeks Verbal FluencyPrimary4 weeks
NCT07517380	Start2026	PhaseNot applicable	ConditionsMild cognitive impairment	Participants40	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary6 months Stroop Color-Word TestPrimary6 months Verbal LearningPrimary6 months Verbal FluencyPrimary6 months Digit Span TestPrimary6 months Picture Naming TestPrimary6 months Complex Figure Copy and RecallPrimary6 months Matrix ReasoningPrimary6 months Corsi Block-Tapping TestPrimary6 months
NCT07512193	Start2026	PhaseNot applicable	ConditionsMild cognitive impairment	Participants10	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestSecondary4 weeks Verbal LearningPrimary4 weeks Verbal FluencySecondary4 weeks Digit Span TestSecondary4 weeks Picture Naming TestSecondary4 weeks Mnemonic Similarity TaskSecondary4 weeks
NCT07466615	Start2026	PhaseNot applicable	ConditionsMild cognitive impairment	Participants40	Lead sponsorOther	StatusNot yet recruiting	Library tests named Verbal FluencyPrimary6 months Short Story RecallPrimary6 months Clock Drawing TaskPrimary6 months
NCT07402356	Start2025	PhaseObservational	ConditionsDementia and Alzheimer's, Mild cognitive impairment, Depression and bipolar disorder	Participants140	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary6 months Verbal LearningSecondary6 months Verbal FluencySecondary6 months N-Back TaskPrimarysame day Category FluencySecondary6 months Picture Naming TestSecondary6 months
NCT07385937	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants150	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestSecondary18 months Verbal FluencySecondary18 months Digit Span TestSecondary18 months Category FluencySecondary18 months Clock Drawing TaskSecondary18 months Cancellation TestSecondary18 months Delayed Recall ModuleSecondary18 months
NCT07366346	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants100	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary5 months Verbal LearningPrimary5 months Verbal FluencyPrimary5 months Category FluencyPrimary5 months
NCT07334392	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment	Participants45	Lead sponsorOther	StatusRecruiting	Library tests named Stroop Color-Word TestPrimary12 weeks Verbal FluencyPrimary12 weeks Digit Span TestPrimary12 weeks
NCT07321821	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment	Participants60	Lead sponsorOther	StatusActive, not recruiting	Library tests named Stroop Color-Word TestSecondary9 weeks Verbal LearningSecondary9 weeks Verbal FluencySecondary9 weeks Digit Span TestSecondary9 weeks Complex Figure Copy and RecallSecondary9 weeks
NCT07286448	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment	Participants100	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary5 weeks Verbal FluencySecondary5 weeks
NCT07248709	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment	Participants68	Lead sponsorOther	StatusCompleted	Library tests named Trail Making TestSecondary12 weeks Verbal FluencyPrimary12 weeks Task Switching TestSecondary12 weeks
NCT07241598	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants70	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestSecondary12 months Verbal FluencySecondary12 months Digit Span TestSecondary12 months Symbol CodingSecondary12 months Go/No-Go TaskSecondary12 months Category FluencySecondary12 months
NCT07149038	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants24	Lead sponsorIndustry	StatusActive, not recruiting	Library tests named Trail Making TestPrimary8 weeks Stroop Color-Word TestPrimary8 weeks Verbal FluencyPrimary8 weeks Task Switching TestPrimary8 weeks
NCT07105800	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment, Aging, frailty and exercise	Participants50	Lead sponsorOther	StatusRecruiting	Library tests named Stroop Color-Word TestSecondary10 weeks Verbal FluencyPrimary10 weeks Digit Span TestPrimary10 weeks Picture Naming TestPrimary10 weeks Clock Drawing TaskPrimary10 weeks
NCT07064226	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants102	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary6 months Verbal FluencySecondary6 months Category FluencySecondary6 months Selective Reminding TaskSecondary6 months
NCT07039708	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment, Healthy volunteers, Aging, frailty and exercise	Participants60	Lead sponsorOther	StatusStopped early	Library tests named Verbal FluencySecondary9 weeks Digit Span TestSecondary9 weeks
NCT07002996	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment	Participants80	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary9 months Verbal LearningSecondary9 months Verbal FluencySecondary9 months Go/No-Go TaskSecondary9 months
NCT06935812	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment	Participants106	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary8 weeks Verbal FluencyPrimary8 weeks Digit Span TestPrimary8 weeks Symbol CodingPrimary8 weeks Clock Drawing TaskPrimary8 weeks Arithmetic Fluency TaskPrimary8 weeks
NCT06897670	Start2025	PhaseObservational	ConditionsMild cognitive impairment, Depression and bipolar disorder	Participants200	Lead sponsorOther	StatusRecruiting	Library tests named Verbal LearningSecondarysame day Verbal FluencySecondarysame day Picture Naming TestSecondarysame day

Questions, answered from the data

How many mild cognitive impairment trials use Verbal Fluency?

177 registered mild cognitive impairment studies on ClinicalTrials.gov name it in an outcome measure, 70 of them in a primary outcome: 21% of the condition's 859 studies with a cognitive outcome, against 11% of all of them. It is the 3rd most named test in mild cognitive impairment trials.

Which tests do mild cognitive impairment trials use with Verbal Fluency?

The Trail Making Test (86 studies), Verbal Learning (69 studies) and the Digit Span Test (67 studies).

How many participants do phase 2 mild cognitive impairment trials that use Verbal Fluency enroll?

Half of the phase 2 studies that name it enroll 99 participants or fewer, and the middle half enroll 55 to 151. 12 of them give a size.

When do mild cognitive impairment trials measure Verbal Fluency?

Half of the primary outcomes that name Verbal Fluency are measured within 5 months of the start, and the middle half from 10 weeks to 9 months. 65 primary outcomes give a duration.

How many completed mild cognitive impairment trials that use Verbal Fluency have reported results?

44 of the 76 completed studies that name it, 58%, have reported results: 24 posted them on ClinicalTrials.gov, 32 have a results paper linked to the registry record, and 12 did both. The other 32 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

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.

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Clinical trials data

Verbal Fluency in mild cognitive impairment trials: 177 registered studies

Registered mild cognitive impairment studies name it in an outcome measure: 177
Name it in a primary outcome, 40%: 70 of 177
Of the condition's 859 studies name it, against 11% of all registered studies: 21%; Other conditions
Median participants per study: 66; By phase

Try Verbal Fluency

Tests named in the same studies

The library tests that mild cognitive impairment studies naming Verbal Fluency name most often beside it.

1
Trail Making Test86 studies, 27 as a primary outcome
2
Verbal Learning69 studies, 37 as a primary outcome
3
Digit Span Test67 studies, 27 as a primary outcome
4
Category Fluency48 studies, 20 as a primary outcome
5
Stroop Color-Word Test48 studies, 17 as a primary outcome
6
Picture Naming Test45 studies, 16 as a primary outcome
7
Symbol Coding34 studies, 16 as a primary outcome
8
Clock Drawing Task26 studies, 14 as a primary outcome
9
Short Story Recall22 studies, 12 as a primary outcome
10
Complex Figure Copy and Recall17 studies, 6 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.

A test as a primary outcomeOnly in secondary or other outcomes

Show as a table

Registered studies by start year
Start year	Studies	A test as a primary outcome
2000	0	0
2001	0	0
2002	0	0
2003	0	0
2004	0	0
2005	0	0
2006	1	0
2007	0	0
2008	1	1
2009	1	0
2010	4	0
2011	3	1
2012	4	2
2013	1	0
2014	5	3
2015	7	4
2016	4	1
2017	10	4
2018	13	6
2019	12	4
2020	16	7
2021	15	7
2022	13	2
2023	18	10
2024	20	8
2025	20	7
2026	9	3

Phases and study sizes

By phase

Early phase 12 studies, 1 as a primary outcome
Phase 13 studies, 1 as a primary outcome
Phase 1/22 studies, 1 as a primary outcome
Phase 213 studies, 6 as a primary outcome
Phase 32 studies, 1 as a primary outcome
Phase 41 studies, 1 as a primary outcome
Not applicable136 studies, 50 as a primary outcome
Observational18 studies, 9 as a primary outcome

Participants per study

Phase 299 median, 55 to 151
Not applicable60 median, 40 to 107
Observational149 median, 70 to 232

Show as a table

Participants per mild cognitive impairment study that names Verbal Fluency, by phase
Phase	Studies with a size	Median	Middle half
Phase 2	12	99	55 to 151
Not applicable	136	60	40 to 107
Observational	18	149	70 to 232

When mild cognitive impairment trials measure it

Half of the primary outcomes that name Verbal Fluency are measured within 5 months of the start, and the middle half from 10 weeks to 9 months. 65 primary outcomes give a duration.

Latest time point of each outcome

Within a day11 outcomes, 4 as a primary outcome
Up to 4 weeks17 outcomes, 4 as a primary outcome
1 to 3 months45 outcomes, 21 as a primary outcome
3 to 6 months36 outcomes, 16 as a primary outcome
6 to 12 months38 outcomes, 11 as a primary outcome
1 to 2 years12 outcomes, 7 as a primary outcome
Over 2 years7 outcomes, 2 as a primary outcome
No duration given11 outcomes, 5 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

166 of the 177 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

Recruiting34 studies, 11 as a primary outcome
Not yet recruiting9 studies, 3 as a primary outcome
Active, not recruiting6 studies, 4 as a primary outcome
Completed76 studies, 28 as a primary outcome
Stopped early13 studies, 6 as a primary outcome
Status unknown39 studies, 18 as a primary outcome

What they test

Behavioral64 studies, 24 as a primary outcome
Drug18 studies, 6 as a primary outcome
Device46 studies, 16 as a primary outcome
Dietary supplement18 studies, 7 as a primary outcome
Procedure5 studies, 1 as a primary outcome
Diagnostic test3 studies, 2 as a primary outcome
Biological2 studies, 2 as a primary outcome
Radiation2 studies, 1 as a primary outcome
Combination product2 studies, 1 as a primary outcome
Other44 studies, 21 as a primary outcome
None given4 studies, 3 as a primary outcome

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

34 countries in all. A study with sites in several counts in each; 12 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 mild cognitive impairment studies that name Verbal Fluency: 44 of 76, 58%

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

Completed mild cognitive impairment studies that name Verbal Fluency and every completed study, by how they reported results
Results	Completed mild cognitive impairment studies that name Verbal Fluency	Every completed study
Results on ClinicalTrials.gov and a paper	12, 16%	776, 10%
Results on ClinicalTrials.gov only	12, 16%	1,139, 14%
A results paper only	20, 26%	1,711, 22%
Neither	32, 42%	4,327, 54%

The 177 studies

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

177 studies match. 70 name Verbal Fluency in a primary outcome. Median size 66 participants. Median time to the primary outcome: 5 months.

Loading 177 studies; the filters turn on when they arrive.

By start year

2026 is partly planned starts.

Show as a table

Matching studies by start year
Start year	Studies	As a primary outcome
2000	0	0
2001	0	0
2002	0	0
2003	0	0
2004	0	0
2005	0	0
2006	1	0
2007	0	0
2008	1	1
2009	1	0
2010	4	0
2011	3	1
2012	4	2
2013	1	0
2014	5	3
2015	7	4
2016	4	1
2017	10	4
2018	13	6
2019	12	4
2020	16	7
2021	15	7
2022	13	2
2023	18	10
2024	20	8
2025	20	7
2026	9	3

Library tests named most

Largest condition groups

Mild cognitive impairment177 studies, 70 as a primary outcome
Dementia and Alzheimer's65 studies, 29 as a primary outcome
Aging, frailty and exercise16 studies, 6 as a primary outcome
Parkinson's disease11 studies, 2 as a primary outcome
Healthy volunteers5 studies, 1 as a primary outcome
Sleep and sleep disorders5 studies, 2 as a primary outcome
Cardiovascular disease4 studies, 2 as a primary outcome
Depression and bipolar disorder3 studies, 1 as a primary outcome
Cancer3 studies, 0 as a primary outcome
Obesity and diabetes3 studies, 3 as a primary outcome
Brain injury and concussion2 studies, 1 as a primary outcome
Stroke1 study, 1 as a primary outcome

Phases

Participants

Lead sponsor: industry 15, other 162. Interventional 159, observational 18.

As a primary outcomeSecondary or other outcomeVerbal Fluency

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.
Study	Start	Phase	Conditions	Participants	Lead sponsor	Status	Library tests named, with the latest time point
NCT07883148	Start2024	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants52	Lead sponsorOther	StatusCompleted	Library tests named Trail Making TestSecondary8 months Verbal LearningSecondary8 months Verbal FluencySecondary8 months Digit Span TestSecondary8 months Complex Figure Copy and RecallSecondary8 months
NCT07842146	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants60	Lead sponsorOther	StatusRecruiting	Library tests named Verbal FluencySecondary11 months Symbol CodingSecondary11 months Category FluencySecondary11 months Delayed Recall ModuleSecondary11 months
NCT07733726	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment, Aging, frailty and exercise	Participants66	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary7 months Verbal FluencySecondary7 months
NCT07731334	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants384	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary12 months Stroop Color-Word TestSecondary12 months Verbal LearningSecondary12 months Verbal FluencySecondary12 months Digit Span TestSecondary12 months Complex Figure Copy and RecallSecondary12 months Corsi Block-Tapping TestSecondary12 months Oddball Target DetectionSecondary
NCT07651085	Start2024	PhaseObservational	ConditionsDementia and Alzheimer's, Mild cognitive impairment, Parkinson's disease, Sleep and sleep disorders	Participants65	Lead sponsorOther	StatusActive, not recruiting	Library tests named Verbal LearningPrimary Verbal FluencyPrimary Category FluencyPrimary Clock Drawing TaskPrimary
NCT07608510	Start2026	PhaseObservational	ConditionsMild cognitive impairment	Participants150	Lead sponsorOther	StatusNot yet recruiting	Library tests named Stroop Color-Word TestSecondary Verbal LearningSecondary Verbal FluencySecondary Picture Naming TestSecondary
NCT07596940	Start2023	PhaseNot applicable	ConditionsMild cognitive impairment	Participants9	Lead sponsorOther	StatusCompleted	Library tests named Verbal LearningPrimary4 weeks Verbal FluencyPrimary4 weeks
NCT07517380	Start2026	PhaseNot applicable	ConditionsMild cognitive impairment	Participants40	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary6 months Stroop Color-Word TestPrimary6 months Verbal LearningPrimary6 months Verbal FluencyPrimary6 months Digit Span TestPrimary6 months Picture Naming TestPrimary6 months Complex Figure Copy and RecallPrimary6 months Matrix ReasoningPrimary6 months Corsi Block-Tapping TestPrimary6 months
NCT07512193	Start2026	PhaseNot applicable	ConditionsMild cognitive impairment	Participants10	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestSecondary4 weeks Verbal LearningPrimary4 weeks Verbal FluencySecondary4 weeks Digit Span TestSecondary4 weeks Picture Naming TestSecondary4 weeks Mnemonic Similarity TaskSecondary4 weeks
NCT07466615	Start2026	PhaseNot applicable	ConditionsMild cognitive impairment	Participants40	Lead sponsorOther	StatusNot yet recruiting	Library tests named Verbal FluencyPrimary6 months Short Story RecallPrimary6 months Clock Drawing TaskPrimary6 months
NCT07402356	Start2025	PhaseObservational	ConditionsDementia and Alzheimer's, Mild cognitive impairment, Depression and bipolar disorder	Participants140	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary6 months Verbal LearningSecondary6 months Verbal FluencySecondary6 months N-Back TaskPrimarysame day Category FluencySecondary6 months Picture Naming TestSecondary6 months
NCT07385937	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants150	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestSecondary18 months Verbal FluencySecondary18 months Digit Span TestSecondary18 months Category FluencySecondary18 months Clock Drawing TaskSecondary18 months Cancellation TestSecondary18 months Delayed Recall ModuleSecondary18 months
NCT07366346	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants100	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary5 months Verbal LearningPrimary5 months Verbal FluencyPrimary5 months Category FluencyPrimary5 months
NCT07334392	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment	Participants45	Lead sponsorOther	StatusRecruiting	Library tests named Stroop Color-Word TestPrimary12 weeks Verbal FluencyPrimary12 weeks Digit Span TestPrimary12 weeks
NCT07321821	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment	Participants60	Lead sponsorOther	StatusActive, not recruiting	Library tests named Stroop Color-Word TestSecondary9 weeks Verbal LearningSecondary9 weeks Verbal FluencySecondary9 weeks Digit Span TestSecondary9 weeks Complex Figure Copy and RecallSecondary9 weeks
NCT07286448	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment	Participants100	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary5 weeks Verbal FluencySecondary5 weeks
NCT07248709	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment	Participants68	Lead sponsorOther	StatusCompleted	Library tests named Trail Making TestSecondary12 weeks Verbal FluencyPrimary12 weeks Task Switching TestSecondary12 weeks
NCT07241598	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants70	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestSecondary12 months Verbal FluencySecondary12 months Digit Span TestSecondary12 months Symbol CodingSecondary12 months Go/No-Go TaskSecondary12 months Category FluencySecondary12 months
NCT07149038	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants24	Lead sponsorIndustry	StatusActive, not recruiting	Library tests named Trail Making TestPrimary8 weeks Stroop Color-Word TestPrimary8 weeks Verbal FluencyPrimary8 weeks Task Switching TestPrimary8 weeks
NCT07105800	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment, Aging, frailty and exercise	Participants50	Lead sponsorOther	StatusRecruiting	Library tests named Stroop Color-Word TestSecondary10 weeks Verbal FluencyPrimary10 weeks Digit Span TestPrimary10 weeks Picture Naming TestPrimary10 weeks Clock Drawing TaskPrimary10 weeks
NCT07064226	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's, Mild cognitive impairment	Participants102	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary6 months Verbal FluencySecondary6 months Category FluencySecondary6 months Selective Reminding TaskSecondary6 months
NCT07039708	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment, Healthy volunteers, Aging, frailty and exercise	Participants60	Lead sponsorOther	StatusStopped early	Library tests named Verbal FluencySecondary9 weeks Digit Span TestSecondary9 weeks
NCT07002996	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment	Participants80	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary9 months Verbal LearningSecondary9 months Verbal FluencySecondary9 months Go/No-Go TaskSecondary9 months
NCT06935812	Start2025	PhaseNot applicable	ConditionsMild cognitive impairment	Participants106	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary8 weeks Verbal FluencyPrimary8 weeks Digit Span TestPrimary8 weeks Symbol CodingPrimary8 weeks Clock Drawing TaskPrimary8 weeks Arithmetic Fluency TaskPrimary8 weeks
NCT06897670	Start2025	PhaseObservational	ConditionsMild cognitive impairment, Depression and bipolar disorder	Participants200	Lead sponsorOther	StatusRecruiting	Library tests named Verbal LearningSecondarysame day Verbal FluencySecondarysame day Picture Naming TestSecondarysame day

Questions, answered from the data

How many mild cognitive impairment trials use Verbal Fluency?

Which tests do mild cognitive impairment trials use with Verbal Fluency?

The Trail Making Test (86 studies), Verbal Learning (69 studies) and the Digit Span Test (67 studies).

How many participants do phase 2 mild cognitive impairment trials that use Verbal Fluency enroll?

Half of the phase 2 studies that name it enroll 99 participants or fewer, and the middle half enroll 55 to 151. 12 of them give a size.

When do mild cognitive impairment trials measure Verbal Fluency?

Half of the primary outcomes that name Verbal Fluency are measured within 5 months of the start, and the middle half from 10 weeks to 9 months. 65 primary outcomes give a duration.

How many completed mild cognitive impairment trials that use Verbal Fluency have reported results?

How the studies are counted

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Verbal Fluency in mild cognitive impairment trials: 177 registered studies

Tests named in the same studies

Studies by start year

Phases and study sizes

By phase

Participants per study

When mild cognitive impairment trials measure it

Latest time point of each outcome

Status, results, interventions and countries

Status

What they test

Where their sites are

Reported results

The 177 studies

Library tests named most

Largest condition groups

Phases

Participants

The studies, newest registration first

Questions, answered from the data

How many mild cognitive impairment trials use Verbal Fluency?

Which tests do mild cognitive impairment trials use with Verbal Fluency?

How many participants do phase 2 mild cognitive impairment trials that use Verbal Fluency enroll?

When do mild cognitive impairment trials measure Verbal Fluency?

How many completed mild cognitive impairment trials that use Verbal Fluency have reported results?

More on Verbal Fluency and mild cognitive impairment

Verbal Fluency in other conditions

Other tests in mild cognitive impairment trials

How the studies are counted

Run Verbal Fluency in your trial

Verbal Fluency in mild cognitive impairment trials: 177 registered studies

Tests named in the same studies

Studies by start year

Phases and study sizes

By phase

Participants per study

When mild cognitive impairment trials measure it

Latest time point of each outcome

Status, results, interventions and countries

Status

What they test

Where their sites are

Reported results

The 177 studies

Library tests named most

Largest condition groups

Phases

Participants

The studies, newest registration first

Questions, answered from the data

How many mild cognitive impairment trials use Verbal Fluency?

Which tests do mild cognitive impairment trials use with Verbal Fluency?

How many participants do phase 2 mild cognitive impairment trials that use Verbal Fluency enroll?

When do mild cognitive impairment trials measure Verbal Fluency?

How many completed mild cognitive impairment trials that use Verbal Fluency have reported results?

More on Verbal Fluency and mild cognitive impairment

Verbal Fluency in other conditions

Other tests in mild cognitive impairment trials

How the studies are counted

Run Verbal Fluency in your trial