Clinical trials data

Verbal Fluency in dementia and Alzheimer's trials: 248 registered studies

Every registered dementia and Alzheimer's disease 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 dementia and Alzheimer's disease studies name it in an outcome measure: 248
Name it in a primary outcome, 38%: 95 of 248
Of the condition's 1,673 studies name it, against 11% of all registered studies: 15%; Other conditions
Median participants per study: 70; By phase

Try Verbal Fluency

Tests named in the same studies

The library tests that dementia and Alzheimer's disease studies naming Verbal Fluency name most often beside it.

1
Trail Making Test101 studies, 37 as a primary outcome
2
Category Fluency93 studies, 29 as a primary outcome
3
Verbal Learning80 studies, 39 as a primary outcome
4
Digit Span Test76 studies, 26 as a primary outcome
5
Picture Naming Test45 studies, 20 as a primary outcome
6
Symbol Coding42 studies, 17 as a primary outcome
7
Stroop Color-Word Test40 studies, 20 as a primary outcome
8
Complex Figure Copy and Recall31 studies, 14 as a primary outcome
9
Clock Drawing Task26 studies, 11 as a primary outcome
10
Short Story Recall26 studies, 10 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	1	0
2005	7	2
2006	2	1
2007	4	0
2008	4	1
2009	4	1
2010	5	1
2011	5	3
2012	6	2
2013	9	4
2014	6	5
2015	8	4
2016	9	2
2017	14	4
2018	20	8
2019	23	9
2020	12	8
2021	12	5
2022	25	9
2023	18	6
2024	20	8
2025	20	8
2026	13	4

Phases and study sizes

By phase

Early phase 12 studies, 1 as a primary outcome
Phase 16 studies, 1 as a primary outcome
Phase 1/26 studies, 3 as a primary outcome
Phase 245 studies, 14 as a primary outcome
Phase 2/33 studies, 1 as a primary outcome
Phase 313 studies, 1 as a primary outcome
Phase 47 studies, 1 as a primary outcome
Not applicable125 studies, 48 as a primary outcome
Observational41 studies, 25 as a primary outcome

Participants per study

Phase 266 median, 42 to 160
Phase 3535 median, 400 to 975
Not applicable60 median, 33 to 136
Observational152 median, 77 to 746

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 dementia and Alzheimer's disease study that names Verbal Fluency, by phase
Phase	Studies with a size	Median	Middle half
Phase 2	44	66	42 to 160
Phase 3	13	535	400 to 975
Not applicable	123	60	33 to 136
Observational	38	152	77 to 746

When dementia and Alzheimer's 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 9 weeks to 10 months. 87 primary outcomes give a duration.

Latest time point of each outcome

Within a day19 outcomes, 9 as a primary outcome
Up to 4 weeks17 outcomes, 6 as a primary outcome
1 to 3 months56 outcomes, 23 as a primary outcome
3 to 6 months55 outcomes, 19 as a primary outcome
6 to 12 months47 outcomes, 15 as a primary outcome
1 to 2 years21 outcomes, 5 as a primary outcome
Over 2 years20 outcomes, 10 as a primary outcome
No duration given13 outcomes, 8 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

235 of the 248 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

Recruiting40 studies, 13 as a primary outcome
Not yet recruiting11 studies, 4 as a primary outcome
Active, not recruiting13 studies, 4 as a primary outcome
Completed119 studies, 46 as a primary outcome
Stopped early29 studies, 12 as a primary outcome
Status unknown36 studies, 16 as a primary outcome

What they test

Behavioral56 studies, 27 as a primary outcome
Drug71 studies, 19 as a primary outcome
Device55 studies, 18 as a primary outcome
Dietary supplement10 studies, 2 as a primary outcome
Procedure9 studies, 4 as a primary outcome
Diagnostic test7 studies, 2 as a primary outcome
Biological14 studies, 2 as a primary outcome
Radiation3 studies, 2 as a primary outcome
Genetic1 studies, 1 as a primary outcome
Other58 studies, 20 as a primary outcome
None given15 studies, 13 as a primary outcome

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

54 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 dementia and Alzheimer's disease studies that name Verbal Fluency: 76 of 119, 64%

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

Completed dementia and Alzheimer's disease studies that name Verbal Fluency and every completed study, by how they reported results
Results	Completed dementia and Alzheimer's disease studies that name Verbal Fluency	Every completed study
Results on ClinicalTrials.gov and a paper	32, 27%	776, 10%
Results on ClinicalTrials.gov only	17, 14%	1,139, 14%
A results paper only	27, 23%	1,711, 22%
Neither	43, 36%	4,327, 54%

The 248 studies

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

248 studies match. 95 name Verbal Fluency in a primary outcome. Median size 70 participants. Median time to the primary outcome: 5 months.

Loading 248 studies; the filters turn on when they arrive.

By start year

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

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	1	0
2005	7	2
2006	2	1
2007	4	0
2008	4	1
2009	4	1
2010	5	1
2011	5	3
2012	6	2
2013	9	4
2014	6	5
2015	8	4
2016	9	2
2017	14	4
2018	20	8
2019	23	9
2020	12	8
2021	12	5
2022	25	9
2023	18	6
2024	20	8
2025	20	8
2026	13	4

Library tests named most

Largest condition groups

Dementia and Alzheimer's248 studies, 95 as a primary outcome
Mild cognitive impairment65 studies, 29 as a primary outcome
Aging, frailty and exercise20 studies, 7 as a primary outcome
Parkinson's disease12 studies, 6 as a primary outcome
Sleep and sleep disorders8 studies, 4 as a primary outcome
Depression and bipolar disorder6 studies, 0 as a primary outcome
Obesity and diabetes6 studies, 4 as a primary outcome
Healthy volunteers5 studies, 4 as a primary outcome
Cancer4 studies, 0 as a primary outcome
Stroke3 studies, 2 as a primary outcome
Delirium, surgery and intensive care2 studies, 0 as a primary outcome
Cardiovascular disease2 studies, 0 as a primary outcome

Phases

Participants

Lead sponsor: industry 50, NIH 2, other 196. Interventional 207, observational 41.

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
NCT07841145	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Aging, frailty and exercise	Participants68	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestSecondary13 weeks Verbal FluencySecondary13 weeks
NCT07741071	Start2026	PhasePhase 2	ConditionsDementia and Alzheimer's	Participants270	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary2 years Verbal FluencySecondary2 years
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
NCT07722169	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's	Participants48	Lead sponsorOther	StatusNot yet recruiting	Library tests named Verbal FluencySecondary13 weeks Digit Span TestSecondary13 weeks Category FluencySecondary13 weeks Picture Naming TestSecondary13 weeks Matrix ReasoningSecondary13 weeks Token Commands TaskSecondary13 weeks
NCT07664865	Start2024	PhaseObservational	ConditionsDementia and Alzheimer's	Participants250	Lead sponsorOther	StatusCompleted	Library tests named Stroop Color-Word TestPrimarysame day Verbal FluencyPrimarysame day Symbol CodingPrimarysame day Picture Naming TestPrimarysame day Clock Drawing TaskPrimarysame day Complex Figure Copy and RecallPrimarysame day Emoji Emotion RecognitionPrimarysame day Selective Reminding TaskPrimarysame day
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
NCT07645638	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's	Participants33	Lead sponsorOther	StatusCompleted	Library tests named Trail Making TestSecondary Verbal FluencySecondary
NCT07642726	Start2018	PhaseObservational	ConditionsDementia and Alzheimer's, Aging, frailty and exercise	Participants276	Lead sponsorOther	StatusCompleted	Library tests named Trail Making TestPrimary12 months Verbal FluencySecondary12 months Delayed Recall ModuleSecondary12 months
NCT07638813	Start2026	PhasePhase 1/2	ConditionsDementia and Alzheimer's	Participants33	Lead sponsorOther	StatusNot yet recruiting	Library tests named Verbal FluencySecondary6 months Category FluencySecondary6 months Picture Naming TestSecondary6 months
NCT07598617	Start2026	PhaseObservational	ConditionsDementia and Alzheimer's	Participants120	Lead sponsorOther	StatusRecruiting	Library tests named Verbal FluencyPrimary12 months Random Dot Motion TaskPrimary12 months Kinetic Depth TaskPrimary12 months
NCT07505784	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's	Participants30	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary Verbal FluencyPrimary Digit Span TestPrimary Go/No-Go TaskPrimary Category FluencyPrimary Task Switching TestPrimary Emoji Emotion RecognitionPrimary
NCT07452939	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Delirium, surgery and intensive care	Participants40	Lead sponsorOther	StatusRecruiting	Library tests named Verbal LearningSecondary4 weeks Verbal FluencySecondary4 weeks Symbol CodingSecondary4 weeks Psychomotor Vigilance TaskSecondary4 weeks Short Story RecallSecondary4 weeks
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
NCT07399418	Start2025	PhaseObservational	ConditionsDementia and Alzheimer's	Participants80	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimarysame day Stroop Color-Word TestPrimarysame day Verbal FluencyPrimarysame day Digit Span TestPrimarysame day Go/No-Go TaskPrimarysame day Category FluencyPrimarysame day Clock Drawing TaskPrimarysame day Complex Figure Copy and RecallPrimarysame day Matrix ReasoningPrimarysame day Selective Reminding TaskPrimarysame day
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
NCT07375771	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's	Participants40	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary12 weeks Verbal LearningPrimary12 weeks Verbal FluencyPrimary12 weeks Digit Span TestPrimary12 weeks Category FluencyPrimary12 weeks Task Switching TestPrimary12 weeks Clock Drawing TaskPrimary12 weeks Complex Figure Copy and RecallPrimary12 weeks Visual Search TestPrimary12 weeks
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
NCT07332260	Start2026	PhasePhase 1	ConditionsDementia and Alzheimer's	Participants10	Lead sponsorOther	StatusRecruiting	Library tests named Verbal FluencySecondary13 weeks
NCT07312435	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's	Participants96	Lead sponsorOther	StatusRecruiting	Library tests named Verbal FluencySecondary13 weeks
NCT07272863	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Aging, frailty and exercise, Sleep and sleep disorders	Participants214	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestPrimary12 months Verbal FluencyPrimary12 months
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
NCT07205003	Start2022	PhaseObservational	ConditionsDementia and Alzheimer's	Participants140	Lead sponsorOther	StatusRecruiting	Library tests named Verbal FluencySecondarysame day
NCT07154511	Start2025	PhasePhase 1/2	ConditionsDementia and Alzheimer's, Parkinson's disease	Participants45	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary14 weeks Verbal LearningPrimary14 weeks Verbal FluencyPrimary14 weeks Line Angle MatchingPrimary14 weeks

Questions, answered from the data

How many dementia and Alzheimer's trials use Verbal Fluency?

248 registered dementia and Alzheimer's disease studies on ClinicalTrials.gov name it in an outcome measure, 95 of them in a primary outcome: 15% of the condition's 1,673 studies with a cognitive outcome, against 11% of all of them. It is the 2nd most named test in dementia and Alzheimer's trials.

Which tests do dementia and Alzheimer's trials use with Verbal Fluency?

The Trail Making Test (101 studies), Category Fluency (93 studies) and Verbal Learning (80 studies).

How many participants do phase 2 dementia and Alzheimer's trials that use Verbal Fluency enroll?

Half of the phase 2 studies that name it enroll 66 participants or fewer, and the middle half enroll 42 to 160. 44 of them give a size.

When do dementia and Alzheimer's 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 9 weeks to 10 months. 87 primary outcomes give a duration.

How many completed dementia and Alzheimer's trials that use Verbal Fluency have reported results?

76 of the 119 completed studies that name it, 64%, have reported results: 49 posted them on ClinicalTrials.gov, 59 have a results paper linked to the registry record, and 32 did both. The other 43 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 dementia and Alzheimer's trials: 248 registered studies

Registered dementia and Alzheimer's disease studies name it in an outcome measure: 248
Name it in a primary outcome, 38%: 95 of 248
Of the condition's 1,673 studies name it, against 11% of all registered studies: 15%; Other conditions
Median participants per study: 70; By phase

Try Verbal Fluency

Tests named in the same studies

The library tests that dementia and Alzheimer's disease studies naming Verbal Fluency name most often beside it.

1
Trail Making Test101 studies, 37 as a primary outcome
2
Category Fluency93 studies, 29 as a primary outcome
3
Verbal Learning80 studies, 39 as a primary outcome
4
Digit Span Test76 studies, 26 as a primary outcome
5
Picture Naming Test45 studies, 20 as a primary outcome
6
Symbol Coding42 studies, 17 as a primary outcome
7
Stroop Color-Word Test40 studies, 20 as a primary outcome
8
Complex Figure Copy and Recall31 studies, 14 as a primary outcome
9
Clock Drawing Task26 studies, 11 as a primary outcome
10
Short Story Recall26 studies, 10 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	1	0
2005	7	2
2006	2	1
2007	4	0
2008	4	1
2009	4	1
2010	5	1
2011	5	3
2012	6	2
2013	9	4
2014	6	5
2015	8	4
2016	9	2
2017	14	4
2018	20	8
2019	23	9
2020	12	8
2021	12	5
2022	25	9
2023	18	6
2024	20	8
2025	20	8
2026	13	4

Phases and study sizes

By phase

Early phase 12 studies, 1 as a primary outcome
Phase 16 studies, 1 as a primary outcome
Phase 1/26 studies, 3 as a primary outcome
Phase 245 studies, 14 as a primary outcome
Phase 2/33 studies, 1 as a primary outcome
Phase 313 studies, 1 as a primary outcome
Phase 47 studies, 1 as a primary outcome
Not applicable125 studies, 48 as a primary outcome
Observational41 studies, 25 as a primary outcome

Participants per study

Phase 266 median, 42 to 160
Phase 3535 median, 400 to 975
Not applicable60 median, 33 to 136
Observational152 median, 77 to 746

Show as a table

Participants per dementia and Alzheimer's disease study that names Verbal Fluency, by phase
Phase	Studies with a size	Median	Middle half
Phase 2	44	66	42 to 160
Phase 3	13	535	400 to 975
Not applicable	123	60	33 to 136
Observational	38	152	77 to 746

When dementia and Alzheimer's 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 9 weeks to 10 months. 87 primary outcomes give a duration.

Latest time point of each outcome

Within a day19 outcomes, 9 as a primary outcome
Up to 4 weeks17 outcomes, 6 as a primary outcome
1 to 3 months56 outcomes, 23 as a primary outcome
3 to 6 months55 outcomes, 19 as a primary outcome
6 to 12 months47 outcomes, 15 as a primary outcome
1 to 2 years21 outcomes, 5 as a primary outcome
Over 2 years20 outcomes, 10 as a primary outcome
No duration given13 outcomes, 8 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

235 of the 248 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

Recruiting40 studies, 13 as a primary outcome
Not yet recruiting11 studies, 4 as a primary outcome
Active, not recruiting13 studies, 4 as a primary outcome
Completed119 studies, 46 as a primary outcome
Stopped early29 studies, 12 as a primary outcome
Status unknown36 studies, 16 as a primary outcome

What they test

Behavioral56 studies, 27 as a primary outcome
Drug71 studies, 19 as a primary outcome
Device55 studies, 18 as a primary outcome
Dietary supplement10 studies, 2 as a primary outcome
Procedure9 studies, 4 as a primary outcome
Diagnostic test7 studies, 2 as a primary outcome
Biological14 studies, 2 as a primary outcome
Radiation3 studies, 2 as a primary outcome
Genetic1 studies, 1 as a primary outcome
Other58 studies, 20 as a primary outcome
None given15 studies, 13 as a primary outcome

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

54 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 dementia and Alzheimer's disease studies that name Verbal Fluency: 76 of 119, 64%

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

Completed dementia and Alzheimer's disease studies that name Verbal Fluency and every completed study, by how they reported results
Results	Completed dementia and Alzheimer's disease studies that name Verbal Fluency	Every completed study
Results on ClinicalTrials.gov and a paper	32, 27%	776, 10%
Results on ClinicalTrials.gov only	17, 14%	1,139, 14%
A results paper only	27, 23%	1,711, 22%
Neither	43, 36%	4,327, 54%

The 248 studies

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

248 studies match. 95 name Verbal Fluency in a primary outcome. Median size 70 participants. Median time to the primary outcome: 5 months.

Loading 248 studies; the filters turn on when they arrive.

By start year

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

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	1	0
2005	7	2
2006	2	1
2007	4	0
2008	4	1
2009	4	1
2010	5	1
2011	5	3
2012	6	2
2013	9	4
2014	6	5
2015	8	4
2016	9	2
2017	14	4
2018	20	8
2019	23	9
2020	12	8
2021	12	5
2022	25	9
2023	18	6
2024	20	8
2025	20	8
2026	13	4

Library tests named most

Largest condition groups

Dementia and Alzheimer's248 studies, 95 as a primary outcome
Mild cognitive impairment65 studies, 29 as a primary outcome
Aging, frailty and exercise20 studies, 7 as a primary outcome
Parkinson's disease12 studies, 6 as a primary outcome
Sleep and sleep disorders8 studies, 4 as a primary outcome
Depression and bipolar disorder6 studies, 0 as a primary outcome
Obesity and diabetes6 studies, 4 as a primary outcome
Healthy volunteers5 studies, 4 as a primary outcome
Cancer4 studies, 0 as a primary outcome
Stroke3 studies, 2 as a primary outcome
Delirium, surgery and intensive care2 studies, 0 as a primary outcome
Cardiovascular disease2 studies, 0 as a primary outcome

Phases

Participants

Lead sponsor: industry 50, NIH 2, other 196. Interventional 207, observational 41.

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
NCT07841145	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Aging, frailty and exercise	Participants68	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestSecondary13 weeks Verbal FluencySecondary13 weeks
NCT07741071	Start2026	PhasePhase 2	ConditionsDementia and Alzheimer's	Participants270	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestSecondary2 years Verbal FluencySecondary2 years
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
NCT07722169	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's	Participants48	Lead sponsorOther	StatusNot yet recruiting	Library tests named Verbal FluencySecondary13 weeks Digit Span TestSecondary13 weeks Category FluencySecondary13 weeks Picture Naming TestSecondary13 weeks Matrix ReasoningSecondary13 weeks Token Commands TaskSecondary13 weeks
NCT07664865	Start2024	PhaseObservational	ConditionsDementia and Alzheimer's	Participants250	Lead sponsorOther	StatusCompleted	Library tests named Stroop Color-Word TestPrimarysame day Verbal FluencyPrimarysame day Symbol CodingPrimarysame day Picture Naming TestPrimarysame day Clock Drawing TaskPrimarysame day Complex Figure Copy and RecallPrimarysame day Emoji Emotion RecognitionPrimarysame day Selective Reminding TaskPrimarysame day
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
NCT07645638	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's	Participants33	Lead sponsorOther	StatusCompleted	Library tests named Trail Making TestSecondary Verbal FluencySecondary
NCT07642726	Start2018	PhaseObservational	ConditionsDementia and Alzheimer's, Aging, frailty and exercise	Participants276	Lead sponsorOther	StatusCompleted	Library tests named Trail Making TestPrimary12 months Verbal FluencySecondary12 months Delayed Recall ModuleSecondary12 months
NCT07638813	Start2026	PhasePhase 1/2	ConditionsDementia and Alzheimer's	Participants33	Lead sponsorOther	StatusNot yet recruiting	Library tests named Verbal FluencySecondary6 months Category FluencySecondary6 months Picture Naming TestSecondary6 months
NCT07598617	Start2026	PhaseObservational	ConditionsDementia and Alzheimer's	Participants120	Lead sponsorOther	StatusRecruiting	Library tests named Verbal FluencyPrimary12 months Random Dot Motion TaskPrimary12 months Kinetic Depth TaskPrimary12 months
NCT07505784	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's	Participants30	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary Verbal FluencyPrimary Digit Span TestPrimary Go/No-Go TaskPrimary Category FluencyPrimary Task Switching TestPrimary Emoji Emotion RecognitionPrimary
NCT07452939	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Delirium, surgery and intensive care	Participants40	Lead sponsorOther	StatusRecruiting	Library tests named Verbal LearningSecondary4 weeks Verbal FluencySecondary4 weeks Symbol CodingSecondary4 weeks Psychomotor Vigilance TaskSecondary4 weeks Short Story RecallSecondary4 weeks
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
NCT07399418	Start2025	PhaseObservational	ConditionsDementia and Alzheimer's	Participants80	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimarysame day Stroop Color-Word TestPrimarysame day Verbal FluencyPrimarysame day Digit Span TestPrimarysame day Go/No-Go TaskPrimarysame day Category FluencyPrimarysame day Clock Drawing TaskPrimarysame day Complex Figure Copy and RecallPrimarysame day Matrix ReasoningPrimarysame day Selective Reminding TaskPrimarysame day
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
NCT07375771	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's	Participants40	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary12 weeks Verbal LearningPrimary12 weeks Verbal FluencyPrimary12 weeks Digit Span TestPrimary12 weeks Category FluencyPrimary12 weeks Task Switching TestPrimary12 weeks Clock Drawing TaskPrimary12 weeks Complex Figure Copy and RecallPrimary12 weeks Visual Search TestPrimary12 weeks
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
NCT07332260	Start2026	PhasePhase 1	ConditionsDementia and Alzheimer's	Participants10	Lead sponsorOther	StatusRecruiting	Library tests named Verbal FluencySecondary13 weeks
NCT07312435	Start2025	PhaseNot applicable	ConditionsDementia and Alzheimer's	Participants96	Lead sponsorOther	StatusRecruiting	Library tests named Verbal FluencySecondary13 weeks
NCT07272863	Start2026	PhaseNot applicable	ConditionsDementia and Alzheimer's, Aging, frailty and exercise, Sleep and sleep disorders	Participants214	Lead sponsorOther	StatusNot yet recruiting	Library tests named Trail Making TestPrimary12 months Verbal FluencyPrimary12 months
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
NCT07205003	Start2022	PhaseObservational	ConditionsDementia and Alzheimer's	Participants140	Lead sponsorOther	StatusRecruiting	Library tests named Verbal FluencySecondarysame day
NCT07154511	Start2025	PhasePhase 1/2	ConditionsDementia and Alzheimer's, Parkinson's disease	Participants45	Lead sponsorOther	StatusRecruiting	Library tests named Trail Making TestPrimary14 weeks Verbal LearningPrimary14 weeks Verbal FluencyPrimary14 weeks Line Angle MatchingPrimary14 weeks

Questions, answered from the data

How many dementia and Alzheimer's trials use Verbal Fluency?

Which tests do dementia and Alzheimer's trials use with Verbal Fluency?

The Trail Making Test (101 studies), Category Fluency (93 studies) and Verbal Learning (80 studies).

How many participants do phase 2 dementia and Alzheimer's trials that use Verbal Fluency enroll?

Half of the phase 2 studies that name it enroll 66 participants or fewer, and the middle half enroll 42 to 160. 44 of them give a size.

When do dementia and Alzheimer's 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 9 weeks to 10 months. 87 primary outcomes give a duration.

How many completed dementia and Alzheimer's trials that use Verbal Fluency have reported results?

How the studies are counted

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Verbal Fluency in dementia and Alzheimer's trials: 248 registered studies

Tests named in the same studies

Studies by start year

Phases and study sizes

By phase

Participants per study

When dementia and Alzheimer's 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 248 studies

Library tests named most

Largest condition groups

Phases

Participants

The studies, newest registration first

Questions, answered from the data

How many dementia and Alzheimer's trials use Verbal Fluency?

Which tests do dementia and Alzheimer's trials use with Verbal Fluency?

How many participants do phase 2 dementia and Alzheimer's trials that use Verbal Fluency enroll?

When do dementia and Alzheimer's trials measure Verbal Fluency?

How many completed dementia and Alzheimer's trials that use Verbal Fluency have reported results?

More on Verbal Fluency and dementia and Alzheimer's disease

Verbal Fluency in other conditions

Other tests in dementia and Alzheimer's trials

How the studies are counted

Run Verbal Fluency in your trial

Verbal Fluency in dementia and Alzheimer's trials: 248 registered studies

Tests named in the same studies

Studies by start year

Phases and study sizes

By phase

Participants per study

When dementia and Alzheimer's 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 248 studies

Library tests named most

Largest condition groups

Phases

Participants

The studies, newest registration first

Questions, answered from the data

How many dementia and Alzheimer's trials use Verbal Fluency?

Which tests do dementia and Alzheimer's trials use with Verbal Fluency?

How many participants do phase 2 dementia and Alzheimer's trials that use Verbal Fluency enroll?

When do dementia and Alzheimer's trials measure Verbal Fluency?

How many completed dementia and Alzheimer's trials that use Verbal Fluency have reported results?

More on Verbal Fluency and dementia and Alzheimer's disease

Verbal Fluency in other conditions

Other tests in dementia and Alzheimer's trials

How the studies are counted

Run Verbal Fluency in your trial