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Study · Measured the body's own peptide · 2004

2 results

The neurobiology of trust.

Zak PJ, Kurzban R, Matzner WT

Annals of the New York Academy of Sciences1 Dec 2004Cited by 85 (Europe PMC)

PMID15677415 (opens in a new tab)DOI10.1196/annals.1314.025 (opens in a new tab)PepBankPUB-15677415
Publisher pagePubMedAsk about this study
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Summary

The text of this summary is not shown here, because the article license does not allow reuse. Read it at the source (opens in a new tab)

Text rights: Publisher copyright. Results still quote short attributed sentences.

Results from this study2

No result from this study comes from a test of the peptide.

Natural levels measured2

These results measure the body's own peptide. Nobody was given the peptide. They are not evidence about taking it. They are left out of key results, evidence counts and charts.

  1. 01HumanEndogenous levelRandomized controlled trialMechanism

    In participants in a social dilemma task, receipt of a trust signal was associated with higher peripheral levels of the body's own oxytocin than a random monetary transfer.

    In plain wordsIn people playing a trust game, receiving a sign of trust was linked to higher body's own oxytocin than a random money transfer.

    Peptide
    Oxytocin
    Outcome
    IncreasePeripheral oxytocin after receipt of a trust signal
    Study

    n: not reported in source

    Comparator
    Random monetary transfer of the same average amount
    Outcome group
    Endogenous peptide levels · Nervous system and cognition

    Source sentences

    Summary
    We show that receipt of a signal of trust is associated with a higher level of peripheral oxytocin than that in subjects receiving a random monetary transfer of the same average amount.
    1 context sentence
    Summary · context
    Subjects are put into a social dilemma in which absent communication, cooperative behavior can benefit both parties randomly assigned to a dyad.

    This result measures the body's own Oxytocin. Nobody was given the peptide. It is not evidence about taking it.

  2. 02HumanEndogenous levelRandomized controlled trialMechanism

    In participants in a social dilemma task, levels of the body's own oxytocin were related to trustworthy behavior, meaning sharing a greater proportion of the monetary gains.

    In plain wordsIn people playing a trust game, the body's own oxytocin levels were linked to how much of the money gains they shared.

    Peptide
    Oxytocin
    Outcome
    Not applicableOxytocin level and trustworthy behavior
    Study

    n: not reported in source

    Outcome group
    Social behavior and cognition · Nervous system and cognition

    Source sentences

    Summary
    Oxytocin levels were also related to trustworthy behavior (sharing a greater proportion of the monetary gains).
    1 context sentence
    Summary · context
    Subjects are put into a social dilemma in which absent communication, cooperative behavior can benefit both parties randomly assigned to a dyad.

    This result measures the body's own Oxytocin. Nobody was given the peptide. It is not evidence about taking it.

AI wrote and checked these results. AI can make mistakes, so check important results against the source.

Version history

PepBank keeps every version of the data on this study. Status changes from Retraction Watch, Europe PMC and Crossref are listed with their source.

  1. Version 2Current

    11 Oct 2026, 20:03 UTC

    Study results updated

  2. Version 1

    9 Oct 2026, 02:50 UTC

    First added · source update from Europe PMC

Subjects

Terms as the source lists them.

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