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  5. /Mnemonic Similarity Task

Clinical trials data

Mnemonic Similarity Task in clinical trials: 62 registered studies

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

Registered studies name it in an outcome measure
62
Name it in a primary outcome, 42%
26 of 62
Against similar tests
Of studies started 2021 to 2025 name it, against 0.5% in 2016 to 2020
0.4%
By year
Median participants per study
60
By phase
Try the Twin or New GameTry the Mnemonic Similarity Task

The conditions it is used in

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

  1. Mild cognitive impairment13 studies, 7 as a primary outcome

  2. Aging, frailty and exercise12 studies, 7 as a primary outcome

  3. Dementia and Alzheimer's11 studies, 5 as a primary outcome

  4. Depression and bipolar disorder7 studies, 3 as a primary outcome

  5. Anxiety, PTSD and OCD5 studies, 2 as a primary outcome

  6. Schizophrenia and psychosis3 studies, 1 as a primary outcome

  7. Healthy volunteers3 studies, 3 as a primary outcome

  8. Sleep and sleep disorders3 studies, 0 as a primary outcome

  9. Pain and fatigue3 studies, 1 as a primary outcome

  10. Cognitive impairment and decline2 studies, 2 as a primary outcome

  11. Obesity and diabetes2 studies, 0 as a primary outcome

  12. Cardiovascular disease2 studies, 1 as a primary outcome

  13. Stroke1 study, 0 as a primary outcome

  14. Brain injury and concussion1 study, 1 as a primary outcome

  15. Parkinson's disease1 study, 1 as a primary outcome

  16. ADHD1 study, 1 as a primary outcome

  17. Substance use and addiction1 study, 0 as a primary outcome

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

  19. Other conditions8 studies, 2 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

How often it is a primary outcome

The Mnemonic Similarity Task is a primary outcome in 42% of its studies. Across the 15 episodic memory tests with a page here, the median is 41%.

  1. Face-name Memory Task53% of 51 studies

  2. Selective Reminding Task49% of 183 studies

  3. Mnemonic Similarity Task42% of 62 studies

  4. Short Story Recall41% of 315 studies

  5. Hidden Path Learning41% of 66 studies

  6. Verbal Learning39% of 1,832 studies

  7. Complex Figure Copy and Recall39% of 276 studies

  8. Category Fluency37% of 623 studies

  9. Picture Order Memory Test35% of 144 studies

  10. Delayed Recall Module35% of 159 studies

  11. Paired Associate Learning34% of 204 studies

  12. Delayed Match-to-Sample32% of 69 studies

Studies by start year

0.4% of the registered studies that started in 2021 to 2025 name it, against 0.5% of those that started in 2016 to 2020. 2026 is partly planned starts.
02000: 0 studies, 0 with a test as a primary outcome20002001: 0 studies, 0 with a test as a primary outcome2002: 0 studies, 0 with a test as a primary outcome2003: 0 studies, 0 with a test as a primary outcome2004: 0 studies, 0 with a test as a primary outcome2005: 0 studies, 0 with a test as a primary outcome20052006: 0 studies, 0 with a test as a primary outcome2007: 0 studies, 0 with a test as a primary outcome2008: 0 studies, 0 with a test as a primary outcome2009: 1 studies, 0 with a test as a primary outcome2010: 0 studies, 0 with a test as a primary outcome20102011: 0 studies, 0 with a test as a primary outcome2012: 0 studies, 0 with a test as a primary outcome2013: 0 studies, 0 with a test as a primary outcome2014: 0 studies, 0 with a test as a primary outcome2015: 0 studies, 0 with a test as a primary outcome20152016: 6 studies, 2 with a test as a primary outcome2017: 1 studies, 0 with a test as a primary outcome2018: 8 studies, 4 with a test as a primary outcome2019: 6 studies, 5 with a test as a primary outcome2020: 1 studies, 0 with a test as a primary outcome20202021: 7 studies, 4 with a test as a primary outcome2022: 6 studies, 4 with a test as a primary outcome2023: 7 studies, 2 with a test as a primary outcome2024: 8 studies, 2 with a test as a primary outcome2025: 3 studies, 1 with a test as a primary outcome20252026: 8 studies, 2 with a test as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

Show as a table
Registered studies by start year
Start yearStudiesA test as a primary outcome
200000
200100
200200
200300
200400
200500
200600
200700
200800
200910
201000
201100
201200
201300
201400
201500
201662
201710
201884
201965
202010
202174
202264
202372
202482
202531
202682

Phases and study sizes

By phase

  • Early phase 11 studies, 0 as a primary outcome
  • Phase 12 studies, 1 as a primary outcome
  • Phase 1/22 studies, 1 as a primary outcome
  • Phase 27 studies, 3 as a primary outcome
  • Phase 32 studies, 0 as a primary outcome
  • Not applicable42 studies, 18 as a primary outcome
  • Observational6 studies, 3 as a primary outcome

Participants per study

102050100
  • Not applicable62 median, 33 to 114
Participants per study. The bar spans the middle half of the studies in each phase, the mark is the median, and the axis is logarithmic. Phases with fewer than 10 studies that give a size are left out.
Show as a table
Participants per study that names the Mnemonic Similarity Task, by phase
PhaseStudies with a sizeMedianMiddle half
Not applicable426233 to 114

When trials measure it

Half of the primary outcomes that name the Mnemonic Similarity Task are measured within 12 weeks of the start, and the middle half from 2 weeks to 6 months. 23 primary outcomes give a duration.

Latest time point of each outcome

  • Within a day8 outcomes, 2 as a primary outcome
  • Up to 4 weeks16 outcomes, 5 as a primary outcome
  • 1 to 3 months13 outcomes, 8 as a primary outcome
  • 3 to 6 months9 outcomes, 4 as a primary outcome
  • 6 to 12 months5 outcomes, 2 as a primary outcome
  • 1 to 2 years3 outcomes, 2 as a primary outcome
  • Over 2 years3 outcomes, 0 as a primary outcome
  • No duration given5 outcomes, 3 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

57 of the 62 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

  • Recruiting15 studies, 9 as a primary outcome
  • Not yet recruiting3 studies, 0 as a primary outcome
  • Active, not recruiting5 studies, 0 as a primary outcome
  • Completed28 studies, 14 as a primary outcome
  • Stopped early3 studies, 1 as a primary outcome
  • Status unknown8 studies, 2 as a primary outcome

What they test

  • Behavioral27 studies, 14 as a primary outcome
  • Drug16 studies, 5 as a primary outcome
  • Device11 studies, 3 as a primary outcome
  • Dietary supplement6 studies, 2 as a primary outcome
  • Procedure1 studies, 0 as a primary outcome
  • Diagnostic test1 studies, 1 as a primary outcome
  • Radiation2 studies, 1 as a primary outcome
  • Other13 studies, 5 as a primary outcome
  • None given2 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 States32 studies, 14 as a primary outcome
  • Canada7 studies, 3 as a primary outcome
  • United Kingdom7 studies, 2 as a primary outcome
  • China4 studies, 1 as a primary outcome
  • Germany3 studies, 1 as a primary outcome
  • Netherlands2 studies, 0 as a primary outcome
  • Switzerland2 studies, 1 as a primary outcome
  • Australia1 studies, 1 as a primary outcome
  • Czechia1 studies, 0 as a primary outcome
  • Philippines1 studies, 1 as a primary outcome
  • Taiwan1 studies, 1 as a primary outcome

11 countries in all. A study with sites in several counts in each; 1 list no site.

Reported results

Completed studies with results posted on ClinicalTrials.gov, a results paper the registry links to the study, or both.

Completed studies that name the Mnemonic Similarity Task: 15 of 28, 54%

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

Completed studies that name the Mnemonic Similarity Task and every completed study, by how they reported results
ResultsCompleted studies that name the Mnemonic Similarity TaskEvery completed study
Results on ClinicalTrials.gov and a paper1, 4%776, 10%
Results on ClinicalTrials.gov only7, 25%1,139, 14%
A results paper only7, 25%1,711, 22%
Neither13, 46%4,327, 54%

Tests named in the same studies

The library tests that studies naming the Mnemonic Similarity Task name most often beside it.
  1. 1

    Verbal Learning17 studies, 12 as a primary outcome

  2. 2

    Trail Making Test13 studies, 6 as a primary outcome

  3. 3

    Digit Span Test12 studies, 6 as a primary outcome

  4. 4

    Symbol Coding8 studies, 5 as a primary outcome

  5. 5

    Stroop Color-Word Test7 studies, 2 as a primary outcome

  6. 6

    Verbal Fluency6 studies, 1 as a primary outcome

  7. 7

    Picture Order Memory Test5 studies, 4 as a primary outcome

  8. 8

    N-Back Task5 studies, 2 as a primary outcome

  9. 9

    Dimensional Change Card Sort4 studies, 2 as a primary outcome

  10. 10

    Picture Naming Test4 studies, 0 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

Compared over time

Studies per start year for the Mnemonic Similarity Task and the tests named with it most. Add or remove tests to compare.
Mnemonic Similarity Task62 studies, 2000 to 2026
01252502000201020202026
Verbal Learning1,819 studies, 2000 to 2026
01252502000201020202026
Trail Making Test2,281 studies, 2000 to 2026
01252502000201020202026
Digit Span Test1,619 studies, 2000 to 2026
01252502000201020202026

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

Show as a table
Registered studies per start year that name each test
Start yearMnemonic Similarity TaskVerbal LearningTrail Making TestDigit Span Test
20000123
20010502
20020831
200301484
2004014104
2005017147
2006013144
20070222114
20080281719
20091282922
20100423237
20110334726
20120424436
20130536044
20140826649
20150918579
201669810369
2017110712282
201889211785
20196122155110
202017612290
20217137172122
20226138188121
20237157228164
20248144211141
20253132210147
20268123201137

Explore the 62 studies

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

62 studies match. 26 name the Mnemonic Similarity Task in a primary outcome. Median size 60 participants. Median time to the primary outcome: 12 weeks.

Loading 62 studies; the filters turn on when they arrive.

By start year
024682000: 0 studies, 0 naming the Mnemonic Similarity Task in a primary outcome20002001: 0 studies, 0 naming the Mnemonic Similarity Task in a primary outcome2002: 0 studies, 0 naming the Mnemonic Similarity Task in a primary outcome2003: 0 studies, 0 naming the Mnemonic Similarity Task in a primary outcome2004: 0 studies, 0 naming the Mnemonic Similarity Task in a primary outcome2005: 0 studies, 0 naming the Mnemonic Similarity Task in a primary outcome20052006: 0 studies, 0 naming the Mnemonic Similarity Task in a primary outcome2007: 0 studies, 0 naming the Mnemonic Similarity Task in a primary outcome2008: 0 studies, 0 naming the Mnemonic Similarity Task in a primary outcome2009: 1 studies, 0 naming the Mnemonic Similarity Task in a primary outcome2010: 0 studies, 0 naming the Mnemonic Similarity Task in a primary outcome20102011: 0 studies, 0 naming the Mnemonic Similarity Task in a primary outcome2012: 0 studies, 0 naming the Mnemonic Similarity Task in a primary outcome2013: 0 studies, 0 naming the Mnemonic Similarity Task in a primary outcome2014: 0 studies, 0 naming the Mnemonic Similarity Task in a primary outcome2015: 0 studies, 0 naming the Mnemonic Similarity Task in a primary outcome20152016: 6 studies, 2 naming the Mnemonic Similarity Task in a primary outcome2017: 1 studies, 0 naming the Mnemonic Similarity Task in a primary outcome2018: 8 studies, 4 naming the Mnemonic Similarity Task in a primary outcome2019: 6 studies, 5 naming the Mnemonic Similarity Task in a primary outcome2020: 1 studies, 0 naming the Mnemonic Similarity Task in a primary outcome20202021: 7 studies, 4 naming the Mnemonic Similarity Task in a primary outcome2022: 6 studies, 4 naming the Mnemonic Similarity Task in a primary outcome2023: 7 studies, 2 naming the Mnemonic Similarity Task in a primary outcome2024: 8 studies, 2 naming the Mnemonic Similarity Task in a primary outcome2025: 3 studies, 1 naming the Mnemonic Similarity Task in a primary outcome20252026: 8 studies, 2 naming the Mnemonic Similarity Task in a primary outcome

2026 is partly planned starts.

Show as a table
Matching studies by start year
Start yearStudiesAs a primary outcome
200000
200100
200200
200300
200400
200500
200600
200700
200800
200910
201000
201100
201200
201300
201400
201500
201662
201710
201884
201965
202010
202174
202264
202372
202482
202531
202682

Library tests named most

  • Mnemonic Similarity Task62 studies, 26 as a primary outcome
  • Verbal Learning17 studies, 12 as a primary outcome
  • Trail Making Test13 studies, 6 as a primary outcome
  • Digit Span Test12 studies, 6 as a primary outcome
  • Symbol Coding8 studies, 5 as a primary outcome
  • Stroop Color-Word Test7 studies, 2 as a primary outcome
  • Verbal Fluency6 studies, 1 as a primary outcome
  • Picture Order Memory Test5 studies, 4 as a primary outcome
  • N-Back Task5 studies, 2 as a primary outcome
  • Dimensional Change Card Sort4 studies, 2 as a primary outcome

Largest condition groups

Phases

Participants

Lead sponsor: industry 3, other 59. Interventional 56, observational 6.

As a primary outcomeSecondary or other outcomeThe Mnemonic Similarity Task

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
NCT07848477Start2026PhaseNot applicableConditionsDepression and bipolar disorderParticipants60Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningPrimary2 weeks
  • Digit Span TestSecondary2 weeks
  • Symbol CodingSecondary2 weeks
  • N-Back TaskSecondary2 weeks
  • Go/No-Go TaskSecondary2 weeks
  • Paired Associate LearningSecondary2 weeks
  • Probabilistic Reversal LearningSecondary2 weeks
  • Mnemonic Similarity TaskSecondary2 weeks
  • Affective Go/No-GoSecondary2 weeks
  • Grid Pattern Span TaskSecondary2 weeks
NCT07799584Start2026PhaseNot applicableConditionsMild cognitive impairmentParticipants120Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningPrimary6 months
  • Digit Span TestPrimary8 weeks
  • N-Back TaskPrimary8 weeks
  • Go/No-Go TaskPrimary8 weeks
  • Mnemonic Similarity TaskPrimary6 months
NCT07718945Start2024PhaseNot applicableConditionsMild cognitive impairmentParticipants55Lead sponsorOtherStatusCompletedLibrary tests named
  • Mnemonic Similarity TaskPrimary10 weeks
NCT07647380Start2026PhaseNot applicableConditionsSchizophrenia and psychosisParticipants50Lead sponsorOtherStatusRecruitingLibrary tests named
  • Oddball Target DetectionSecondary4 weeks
  • Mnemonic Similarity TaskSecondary4 weeks
  • Sternberg Memory ScanningSecondary4 weeks
NCT07512193Start2026PhaseNot applicableConditionsMild cognitive impairmentParticipants10Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary4 weeks
  • Verbal LearningPrimary4 weeks
  • Verbal FluencySecondary4 weeks
  • Digit Span TestSecondary4 weeks
  • Picture Naming TestSecondary4 weeks
  • Mnemonic Similarity TaskSecondary4 weeks
NCT07511179Start2026PhaseNot applicableConditionsOther conditionsParticipants10Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary4 weeks
  • Verbal LearningPrimary4 weeks
  • Verbal FluencySecondary4 weeks
  • Digit Span TestSecondary4 weeks
  • Picture Naming TestSecondary4 weeks
  • Mnemonic Similarity TaskSecondary4 weeks
NCT07501377Start2026PhaseNot applicableConditionsObesity and diabetesParticipants120Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestOther outcome6 months
  • Stroop Color-Word TestOther outcome6 months
  • Verbal LearningSecondary6 months
  • Attention Network TestOther outcome6 months
  • Mnemonic Similarity TaskOther outcome6 months
NCT07477431Start2025PhasePhase 2ConditionsDementia and Alzheimer's, ADHDParticipants40Lead sponsorOtherStatusRecruitingLibrary tests named
  • Mnemonic Similarity TaskPrimary12 weeks
NCT07446478Start2026PhaseNot applicableConditionsSchizophrenia and psychosisParticipants10Lead sponsorOtherStatusCompletedLibrary tests named
  • Mnemonic Similarity TaskSecondary2 weeks
  • Sternberg Memory ScanningSecondary2 weeks
NCT07139834Start2026PhasePhase 1ConditionsDepression and bipolar disorderParticipants30Lead sponsorOtherStatusRecruitingLibrary tests named
  • Mnemonic Similarity TaskPrimary11 weeks
NCT06967363Start2025PhaseObservationalConditionsSleep and sleep disorders, Pain and fatigueParticipants360Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary12 months
  • Stroop Color-Word TestSecondary12 months
  • Attention Network TestSecondary12 months
  • Mnemonic Similarity TaskSecondary12 months
  • Pain Empathy TaskSecondary12 months
  • Think and No-Think TaskSecondary12 months
NCT06636812Start2024PhaseEarly phase 1ConditionsAnxiety, PTSD and OCDParticipants60Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Task Switching TestSecondarysame day
  • Dot-Probe TaskSecondarysame day
  • Mnemonic Similarity TaskSecondarysame day
NCT06633978Start2024PhaseNot applicableConditionsMild cognitive impairment, Aging, frailty and exerciseParticipants90Lead sponsorOtherStatusActive, not recruitingLibrary tests named
  • Continuous Performance TestPrimary6 months
  • AX Continuous Performance TestWording unclear
  • Mnemonic Similarity TaskOther outcome6 months
NCT06633952Start2024PhaseNot applicableConditionsMild cognitive impairment, Aging, frailty and exerciseParticipants90Lead sponsorOtherStatusActive, not recruitingLibrary tests named
  • Continuous Performance TestPrimary
  • AX Continuous Performance TestWording unclear
  • Mnemonic Similarity TaskOther outcome
NCT06518421Start2024PhaseObservationalConditionsPain and fatigueParticipants400Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningSecondary6 months
  • Mnemonic Similarity TaskPrimary6 months
NCT06496425Start2024PhaseNot applicableConditionsDementia and Alzheimer's, Aging, frailty and exerciseParticipants80Lead sponsorOtherStatusRecruitingLibrary tests named
  • Tower PlanningSecondary4 weeks
  • Dimensional Change Card SortSecondary4 weeks
  • Size Order Memory TestSecondary4 weeks
  • Picture Order Memory TestSecondary4 weeks
  • Mnemonic Similarity TaskSecondary4 weeks
NCT06367738Start2025PhasePhase 1ConditionsAging, frailty and exerciseParticipants40Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal LearningSecondary4 weeks
  • Short Story RecallSecondary4 weeks
  • Mnemonic Similarity TaskSecondary4 weeks
NCT06364189Start2024PhaseNot applicableConditionsAging, frailty and exerciseParticipants54Lead sponsorOtherStatusCompletedLibrary tests named
  • Tower PlanningSecondary6 months
  • Dimensional Change Card SortSecondary6 months
  • Mnemonic Similarity TaskSecondary6 months
NCT06351098Start2023PhaseNot applicableConditionsOther conditionsParticipants180Lead sponsorOtherStatusRecruitingLibrary tests named
  • Mnemonic Similarity TaskPrimarysame day
NCT06032156Start2023PhaseNot applicableConditionsStrokeParticipants20Lead sponsorOtherStatusCompleted

Paper

Library tests named
  • Mnemonic Similarity TaskSecondarysame day
NCT05988593Start2022PhaseNot applicableConditionsOther conditionsParticipants64Lead sponsorIndustryStatusCompletedLibrary tests named
  • Trail Making TestPrimary8 weeks
  • Mnemonic Similarity TaskPrimary8 weeks
NCT05974605Start2022PhaseNot applicableConditionsHealthy volunteers, Aging, frailty and exerciseParticipants16Lead sponsorOtherStatusCompletedLibrary tests named
  • Verbal LearningPrimary10 weeks
  • Symbol CodingPrimary10 weeks
  • N-Back TaskPrimary10 weeks
  • Task Switching TestPrimary10 weeks
  • Short Story RecallPrimary10 weeks
  • Matrix ReasoningPrimary10 weeks
  • Size Order Memory TestPrimary10 weeks
  • Picture Order Memory TestPrimary10 weeks
  • Mnemonic Similarity TaskPrimary10 weeks
NCT05839405Start2023PhaseObservationalConditionsAnxiety, PTSD and OCDParticipants50Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Mnemonic Similarity TaskSecondary2.5 years
NCT05795634Start2023PhaseNot applicableConditionsDementia and Alzheimer's, Mild cognitive impairmentParticipants240Lead sponsorOtherStatusRecruitingLibrary tests named
  • Verbal FluencyPrimary2 years
  • Digit Span TestPrimary2 years
  • Mnemonic Similarity TaskPrimary2 years
NCT05755997Start2023PhasePhase 2ConditionsOther conditionsParticipants30Lead sponsorIndustryStatusActive, not recruitingLibrary tests named
  • Trail Making TestPrimary2 years
  • Stroop Color-Word TestPrimary2 years
  • Verbal LearningPrimary2 years
  • Digit Span TestPrimary2 years
  • Symbol CodingPrimary2 years
  • Complex Figure Copy and RecallPrimary2 years
  • Symbol Scan TaskSecondary2 years
  • Mnemonic Similarity TaskSecondary2 years

Page 1 of 3

Questions, answered from the data

How many clinical trials use the Mnemonic Similarity Task?

62 registered studies on ClinicalTrials.gov name it in an outcome measure, 26 of them in a primary outcome.

In which conditions do trials use the Mnemonic Similarity Task?

Most often in mild cognitive impairment (13), aging, frailty and exercise (12) and dementia and Alzheimer's disease (11).

Do new trials use the Mnemonic Similarity Task more or less?

0.4% of the studies that started in 2021 to 2025 name it, against 0.5% of those that started in 2016 to 2020: a share 11% smaller.

Which tests do trials use with the Mnemonic Similarity Task?

Verbal Learning (17 studies), the Trail Making Test (13 studies) and the Digit Span Test (12 studies).

When do trials measure the Mnemonic Similarity Task?

Half of the primary outcomes that name the Mnemonic Similarity Task are measured within 12 weeks of the start, and the middle half from 2 weeks to 6 months. 23 primary outcomes give a duration.

How many completed trials that use the Mnemonic Similarity Task have reported results?

15 of the 28 completed studies that name it, 54%, have reported results: 8 posted them on ClinicalTrials.gov, 8 have a results paper linked to the registry record, and 1 did both. The other 13 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

More on tests in clinical trials

  • Twin or New Game: what it measures, its scores, and a version to try
  • Mnemonic Similarity Task: what it measures, its scores, and a version to try
  • All 101 tests in clinical trials
  • Cognitive tests by condition
  • Every registered study, by test, condition, phase and year

How the studies are counted

For each test family, the census runs ClinicalTrials.gov's own outcome search for the family's names and reads every study first posted by the day the family was counted. These studies were read on 10 November 2026. A study counts once on a page, however many tests it names. Counts for a test cover every version of the task under any of its names, so a page can count studies that used a commercial version.

The census adds two things to each record and changes nothing in it: which outcome list names the test (primary, then secondary, then other), and the condition groups, matched on the study's condition names and MeSH terms. A study can fall in several groups; one whose only condition is cognitive impairment or decline falls in “Cognitive impairment and decline”. Studies that name only instruments outside the library count in every total and share but are not listed.

A second read on 10 November 2026 added each study's overall status, whether results are posted, its intervention types, the countries of its sites and the time frame of the outcome that names each test. A time frame counts by the latest time point it names: “Baseline, 12 and 24 weeks” is 24 weeks, a single visit is within a day, and one that names no duration, such as “end of treatment”, is left out of the timings.

A third read on 10 November 2026 added the papers the registry links to each study: those its sponsor lists as reporting results, and those PubMed links to it through the study's NCT number. A study has a results paper when one of them came out in or after the month of its primary completion and PubMed does not class it as a protocol, review or comment. A paper that never gives the NCT number is not linked, so some studies counted as reporting neither did publish.

Source: ClinicalTrials.gov, a database of the U.S. National Library of Medicine, which does not endorse these pages. Every study line is in the data release 2.1.0, and the explorer's own file is clinical-trials-studies.json.

The census counts Twin or New Game and Mnemonic Similarity Task as one test family, so this page counts their studies together: 62 studies.

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