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  1. Home
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  3. /Clinical trials
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  5. /Substance use and addiction
  6. /Purchase Task

Clinical trials data

Purchase Task in substance use and addiction trials: 78 registered studies

Every registered substance use and addiction study on ClinicalTrials.gov that names the Purchase Task 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 substance use and addiction studies name it in an outcome measure
78
Name it in a primary outcome, 38%
30 of 78
Of the condition's 895 studies name it, against 1% of all registered studies
9%
Other conditions
Median participants per study
71
By phase
Try the Purchase Task

Tests named in the same studies

The library tests that substance use and addiction studies naming the Purchase Task name most often beside it.
  1. 1

    Delay Discounting14 studies, 4 as a primary outcome

  2. 2

    Stop-Signal Task4 studies, 3 as a primary outcome

  3. 3

    N-Back Task4 studies, 2 as a primary outcome

  4. 4

    Go/No-Go Task4 studies, 0 as a primary outcome

  5. 5

    Sustained Attention to Response3 studies, 0 as a primary outcome

  6. 6

    Trail Making Test3 studies, 0 as a primary outcome

  7. 7

    Verbal Learning3 studies, 0 as a primary outcome

  8. 8

    Stroop Color-Word Test2 studies, 2 as a primary outcome

  9. 9

    Progressive Ratio Task2 studies, 1 as a primary outcome

  10. 10

    Cue Reactivity Task2 studies, 0 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

Studies by start year

Each study counted once. 2026 is partly planned starts.
02000: 0 studies, 0 with a test as a primary outcome20002001: 0 studies, 0 with a test as a primary outcome2002: 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: 0 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: 1 studies, 0 with a test as a primary outcome20152016: 2 studies, 1 with a test as a primary outcome2017: 4 studies, 2 with a test as a primary outcome2018: 8 studies, 2 with a test as a primary outcome2019: 4 studies, 1 with a test as a primary outcome2020: 6 studies, 5 with a test as a primary outcome20202021: 6 studies, 1 with a test as a primary outcome2022: 11 studies, 4 with a test as a primary outcome2023: 8 studies, 3 with a test as a primary outcome2024: 8 studies, 3 with a test as a primary outcome2025: 11 studies, 4 with a test as a primary outcome20252026: 8 studies, 3 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
200900
201000
201100
201200
201300
201400
201510
201621
201742
201882
201941
202065
202161
2022114
202383
202483
2025114
202683

Phases and study sizes

By phase

  • Early phase 15 studies, 4 as a primary outcome
  • Phase 15 studies, 2 as a primary outcome
  • Phase 1/22 studies, 0 as a primary outcome
  • Phase 210 studies, 3 as a primary outcome
  • Phase 32 studies, 0 as a primary outcome
  • Phase 41 studies, 0 as a primary outcome
  • Not applicable51 studies, 21 as a primary outcome
  • Observational2 studies, 0 as a primary outcome

Participants per study

102050100200
  • Not applicable110 median, 52 to 169
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 substance use and addiction study that names the Purchase Task, by phase
PhaseStudies with a sizeMedianMiddle half
Not applicable4911052 to 169

When substance use and addiction trials measure it

Half of the primary outcomes that name the Purchase Task are measured within 1 week of the start, and the middle half from the first day to 3 weeks. 28 primary outcomes give a duration.

Latest time point of each outcome

  • Within a day22 outcomes, 11 as a primary outcome
  • Up to 4 weeks30 outcomes, 16 as a primary outcome
  • 1 to 3 months13 outcomes, 1 as a primary outcome
  • 3 to 6 months1 outcomes, 0 as a primary outcome
  • 6 to 12 months3 outcomes, 0 as a primary outcome
  • 1 to 2 years1 outcomes, 0 as a primary outcome
  • No duration given7 outcomes, 2 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

70 of the 77 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

  • Recruiting16 studies, 5 as a primary outcome
  • Not yet recruiting2 studies, 1 as a primary outcome
  • Active, not recruiting4 studies, 1 as a primary outcome
  • Completed47 studies, 21 as a primary outcome
  • Stopped early8 studies, 2 as a primary outcome
  • Status unknown1 studies, 0 as a primary outcome

What they test

  • Behavioral37 studies, 15 as a primary outcome
  • Drug30 studies, 12 as a primary outcome
  • Device7 studies, 2 as a primary outcome
  • Dietary supplement1 studies, 0 as a primary outcome
  • Procedure5 studies, 3 as a primary outcome
  • Other26 studies, 9 as a primary outcome
  • None given2 studies, 0 as a primary outcome

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

Where their sites are

  • United States67 studies, 28 as a primary outcome
  • Canada4 studies, 2 as a primary outcome
  • Spain2 studies, 0 as a primary outcome
  • Australia1 studies, 0 as a primary outcome
  • Switzerland1 studies, 0 as a primary outcome
  • Uganda1 studies, 0 as a primary outcome

6 countries in all. A study with sites in several counts in each; 2 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 substance use and addiction studies that name the Purchase Task: 31 of 47, 66%

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

Completed substance use and addiction studies that name the Purchase Task and every completed study, by how they reported results
ResultsCompleted substance use and addiction studies that name the Purchase TaskEvery completed study
Results on ClinicalTrials.gov and a paper8, 17%776, 10%
Results on ClinicalTrials.gov only19, 40%1,139, 14%
A results paper only4, 9%1,711, 22%
Neither16, 34%4,327, 54%

The 78 studies

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

78 studies match. 30 name the Purchase Task in a primary outcome. Median size 71 participants. Median time to the primary outcome: 1 week.

Loading 78 studies; the filters turn on when they arrive.

By start year
0510152000: 0 studies, 0 naming the Purchase Task in a primary outcome20002001: 0 studies, 0 naming the Purchase Task in a primary outcome2002: 0 studies, 0 naming the Purchase Task in a primary outcome2003: 0 studies, 0 naming the Purchase Task in a primary outcome2004: 0 studies, 0 naming the Purchase Task in a primary outcome2005: 0 studies, 0 naming the Purchase Task in a primary outcome20052006: 0 studies, 0 naming the Purchase Task in a primary outcome2007: 0 studies, 0 naming the Purchase Task in a primary outcome2008: 0 studies, 0 naming the Purchase Task in a primary outcome2009: 0 studies, 0 naming the Purchase Task in a primary outcome2010: 0 studies, 0 naming the Purchase Task in a primary outcome20102011: 0 studies, 0 naming the Purchase Task in a primary outcome2012: 0 studies, 0 naming the Purchase Task in a primary outcome2013: 0 studies, 0 naming the Purchase Task in a primary outcome2014: 0 studies, 0 naming the Purchase Task in a primary outcome2015: 1 studies, 0 naming the Purchase Task in a primary outcome20152016: 2 studies, 1 naming the Purchase Task in a primary outcome2017: 4 studies, 2 naming the Purchase Task in a primary outcome2018: 8 studies, 2 naming the Purchase Task in a primary outcome2019: 4 studies, 1 naming the Purchase Task in a primary outcome2020: 6 studies, 5 naming the Purchase Task in a primary outcome20202021: 6 studies, 1 naming the Purchase Task in a primary outcome2022: 11 studies, 4 naming the Purchase Task in a primary outcome2023: 8 studies, 3 naming the Purchase Task in a primary outcome2024: 8 studies, 3 naming the Purchase Task in a primary outcome2025: 11 studies, 4 naming the Purchase Task in a primary outcome20252026: 8 studies, 3 naming the Purchase Task in a primary outcome

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

Show as a table
Matching studies by start year
Start yearStudiesAs a primary outcome
200000
200100
200200
200300
200400
200500
200600
200700
200800
200900
201000
201100
201200
201300
201400
201510
201621
201742
201882
201941
202065
202161
2022114
202383
202483
2025114
202683

Library tests named most

  • Purchase Task78 studies, 30 as a primary outcome
  • Delay Discounting14 studies, 4 as a primary outcome
  • Stop-Signal Task4 studies, 3 as a primary outcome
  • N-Back Task4 studies, 2 as a primary outcome
  • Go/No-Go Task4 studies, 0 as a primary outcome
  • Sustained Attention to Response3 studies, 0 as a primary outcome
  • Trail Making Test3 studies, 0 as a primary outcome
  • Verbal Learning3 studies, 0 as a primary outcome
  • Stroop Color-Word Test2 studies, 2 as a primary outcome
  • Progressive Ratio Task2 studies, 1 as a primary outcome

Conditions

  • Substance use and addiction78 studies, 30 as a primary outcome
  • Cancer6 studies, 3 as a primary outcome
  • Pain and fatigue3 studies, 2 as a primary outcome
  • Healthy volunteers2 studies, 1 as a primary outcome
  • Anxiety, PTSD and OCD2 studies, 0 as a primary outcome
  • Aging, frailty and exercise1 study, 0 as a primary outcome
  • Obesity and diabetes1 study, 0 as a primary outcome
  • Cardiovascular disease1 study, 0 as a primary outcome

Phases

Participants

Lead sponsor: other 78. Interventional 76, observational 2.

As a primary outcomeSecondary or other outcomeThe Purchase 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
NCT07899827Start2027PhaseNot applicableConditionsCancer, Substance use and addictionParticipants50Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Purchase TaskPrimary4 weeks
NCT07688304Start2026PhaseNot applicableConditionsSubstance use and addictionParticipants30Lead sponsorOtherStatusRecruitingLibrary tests named
  • Purchase TaskPrimary
NCT07585006Start2026PhasePhase 1ConditionsCancer, Substance use and addictionParticipants70Lead sponsorOtherStatusRecruitingLibrary tests named
  • Purchase TaskPrimary2 days
NCT07564648Start2026PhaseNot applicableConditionsSubstance use and addictionParticipants48Lead sponsorOtherStatusRecruitingLibrary tests named
  • Purchase TaskSecondary3 weeks
  • Progressive Ratio TaskSecondary3 weeks
NCT07434895Start2026PhaseEarly phase 1ConditionsHealthy volunteers, Substance use and addiction, Pain and fatigueParticipants23Lead sponsorOtherStatusRecruitingLibrary tests named
  • Purchase TaskPrimary2 weeks
NCT07348679Start2026PhaseNot applicableConditionsSubstance use and addictionParticipants252Lead sponsorOtherStatusRecruitingLibrary tests named
  • Purchase TaskSecondary5 weeks
NCT07292519Start2026PhasePhase 2ConditionsObesity and diabetes, Substance use and addictionParticipants46Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Cue Reactivity TaskSecondary12 weeks
  • Purchase TaskOther outcome12 weeks
NCT07157540Start2026PhaseNot applicableConditionsSubstance use and addictionParticipants565Lead sponsorOtherStatusRecruitingLibrary tests named
  • Purchase TaskOther outcome7 months
NCT07111234Start2025PhaseNot applicableConditionsCancer, Substance use and addictionParticipants30Lead sponsorOtherStatusRecruitingLibrary tests named
  • Purchase TaskPrimarysame day
NCT07092501Start2025PhaseNot applicableConditionsSubstance use and addictionParticipants24Lead sponsorOtherStatusCompletedLibrary tests named
  • Purchase TaskSecondarysame day
NCT07010601Start2025PhaseNot applicableConditionsSubstance use and addictionParticipants737Lead sponsorOtherStatusCompleted

Results

Library tests named
  • Purchase TaskPrimarysame day
NCT07001930Start2025PhasePhase 1ConditionsSubstance use and addictionParticipants90Lead sponsorOtherStatusRecruitingLibrary tests named
  • N-Back TaskSecondarysame day
  • Purchase TaskSecondarysame day
  • Sustained Attention to ResponseSecondarysame day
NCT06988371Start2025PhaseNot applicableConditionsSubstance use and addictionParticipants747Lead sponsorOtherStatusCompletedLibrary tests named
  • Delay DiscountingSecondarysame day
  • Purchase TaskSecondarysame day
NCT06954402Start2026PhaseNot applicableConditionsSubstance use and addictionParticipants125Lead sponsorOtherStatusRecruitingLibrary tests named
  • Stroop Color-Word TestPrimary
  • Purchase TaskSecondary
  • Emotional Stroop TaskPrimary
NCT06771843Start2025PhaseNot applicableConditionsSubstance use and addictionParticipants716Lead sponsorOtherStatusRecruitingLibrary tests named
  • Delay DiscountingOther outcome12 months
  • Purchase TaskOther outcome12 months
NCT06747871Start2025PhaseNot applicableConditionsSubstance use and addiction, Pain and fatigueParticipants60Lead sponsorOtherStatusRecruitingLibrary tests named
  • Purchase TaskPrimary4 weeks
NCT06630728Start2025PhasePhase 4ConditionsSubstance use and addictionParticipants50Lead sponsorOtherStatusRecruitingLibrary tests named
  • Purchase TaskSecondarysame day
NCT06629467Start2023PhaseNot applicableConditionsAging, frailty and exercise, Substance use and addictionParticipants128Lead sponsorOtherStatusCompletedLibrary tests named
  • Delay DiscountingSecondary6 weeks
  • Purchase TaskSecondarysame day
NCT06576674Start2024PhaseNot applicableConditionsSubstance use and addictionParticipants64Lead sponsorOtherStatusCompleted

Results

Library tests named
  • Dot-Probe TaskSecondarysame day
  • Purchase TaskSecondarysame day
NCT06506162Start2024PhaseNot applicableConditionsSubstance use and addictionParticipants320Lead sponsorOtherStatusRecruitingLibrary tests named
  • Purchase TaskSecondary
NCT06432361Start2025PhaseNot applicableConditionsSubstance use and addictionParticipants104Lead sponsorOtherStatusCompletedLibrary tests named
  • Purchase TaskPrimary4 weeks
NCT06430580Start2024PhaseEarly phase 1ConditionsSubstance use and addictionParticipants38Lead sponsorOtherStatusCompletedLibrary tests named
  • Purchase TaskPrimary3 weeks
NCT06315881Start2025PhasePhase 2ConditionsCancer, Substance use and addictionParticipants160Lead sponsorOtherStatusRecruitingLibrary tests named
  • Purchase TaskSecondary13 weeks
NCT06277271Start2023PhaseNot applicableConditionsSubstance use and addictionParticipants30Lead sponsorOtherStatusCompletedLibrary tests named
  • Purchase TaskSecondary4 weeks
NCT06234722Start2024PhaseNot applicableConditionsSubstance use and addictionParticipants473Lead sponsorOtherStatusRecruitingLibrary tests named
  • Delay DiscountingSecondary4 weeks
  • Purchase TaskSecondary4 weeks

Page 1 of 4

Questions, answered from the data

How many substance use and addiction trials use the Purchase Task?

78 registered substance use and addiction studies on ClinicalTrials.gov name it in an outcome measure, 30 of them in a primary outcome: 9% of the condition's 895 studies with a cognitive outcome, against 1% of all of them. It is the 5th most named test in substance use and addiction trials.

Which tests do substance use and addiction trials use with the Purchase Task?

Delay Discounting (14 studies), the Stop-Signal Task (4 studies) and the N-Back Task (4 studies).

When do substance use and addiction trials measure the Purchase Task?

Half of the primary outcomes that name the Purchase Task are measured within 1 week of the start, and the middle half from the first day to 3 weeks. 28 primary outcomes give a duration.

How many completed substance use and addiction trials that use the Purchase Task have reported results?

31 of the 47 completed studies that name it, 66%, have reported results: 27 posted them on ClinicalTrials.gov, 12 have a results paper linked to the registry record, and 8 did both. The other 16 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

More on the Purchase Task and substance use and addiction

  • Every cognitive test in substance use and addiction trials: 895 studies
  • The Purchase Task in all clinical trials: 89 studies

Other tests in substance use and addiction trials

  • Cue Reactivity Task158
  • Delay Discounting104
  • Stop-Signal Task92
  • Go/No-Go Task80
  • Verbal Learning77
  • Stroop Color-Word Test75
  • N-Back Task68
  • Symbol Coding60
  • Continuous Performance Test53
  • Trail Making Test52

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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