Crunching the numbers. Responsibly.
We find no effect of OT on trusting behaviour in the MSC condition.
preregistered, highly powered analysis with Bayesian evidence favouring the null
Exploratory post hoc analyses suggest that OT may increase trust in individuals with a low disposition to trust in the NoC condition, but this finding requires confirmation in future research.
post hoc subgroup analysis with 60% power requires preregistered confirmation
Replication outlook: fragile
the simple and general hypothesis that ‘OT increases trust’ can no longer be endorsed.
confirmatory null results and Bayesian evidence reject the simple general formulation
The MSC condition negatively affected the degree to which participants felt close to their game partners.
direct regression evidence from the full sample, retained conservatively as a singleton claim
Replication outlook: favorable
Derived from the full evaluation — not a separate score.
Strengths
The Stage 1 protocol preceded data collection, and the final sample of 677 retained more than 95% power for the main hypotheses. The design directly reinstated the minimal-social-contact condition at issue in the original study.
↳ Protocol registration; Methods, Study sample and determination of sample size
The prespecified OLS tests found no oxytocin effect in the minimal-social-contact condition, and follow-up Bayes factors favoured the null over hypotheses 1 and 2.
↳ Results, Table 1 and Supplementary Table 1 discussion
The low-dispositional-trust result is labelled post hoc, its 60% power is disclosed, and the Discussion calls for adequately powered preregistered confirmation.
↳ Abstract; Results, Table 2 and Fig. 2; Discussion and recommendations
Limitations
Minimal social contact reduced reported connectedness rather than creating the intended positive affective cue. This complicates interpretation of whether social salience moderates oxytocin’s effect as theorised.
↳ Results, Table 3; Discussion and recommendations
Participants were young healthy male students from two European cities. Replication fidelity justifies this choice, but it limits inference to women, older adults, clinical populations, and other settings.
↳ Methods, Study sample and determination of sample size; Exclusion criteria
The low-dispositional-trust finding arose from post hoc subgroup analyses with 60% power. It cannot support a targeted oxytocin intervention without preregistered replication.
↳ Results, Table 2 and Fig. 2; Discussion and recommendations
The registered 2×2 design, large two-site sample, stratified randomisation, and Bayesian follow-up make the primary null unusually secure for this literature. Transparent sensitivity analyses address the smaller-than-planned sample, revised nasal-obstruction handling, and post hoc exclusions. The main interpretive constraint is Table 3: minimal social contact reduced connectedness, so the intended positive social cue was not achieved. The male-only student sample and 60%-powered subgroup analysis further limit transfer and near-term application without weakening the preregistered null result.
Nabu’s assessment, alongside the field’s view.
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Exemplary4.5
The score reflects a well-powered registered replication that addresses the documented absence of a direct replication preserving minimal social contact. The primary null is proportionate to the confirmatory evidence, while the subgroup result is explicitly presented as preliminary.
“We find no effect of OT on trusting behaviour in the MSC condition.”
The 2×2 double-blind, placebo-controlled design uses stratified randomisation, more than 95% power, objective computer-recorded transfers, and prespecified regression tests. Deviations from the planned sample and exclusion criteria are disclosed and accompanied by sensitivity analyses.
“OT and placebo administration was performed double blind following a randomized block design.”
The paper follows its three preregistered hypotheses through the Results and clearly separates them from post hoc subgroup analyses. Its wording consistently distinguishes Bayesian-supported null findings from a 60%-powered exploratory result requiring confirmation.
“Overall, future research should confirm these preliminary findings.”
The article engages the original study, six non-direct replications, power and publication-bias critiques, and person-by-context theories. It traces ceiling effects and the unexpected reduction in connectedness into interpretation, although the failed positive-cue manipulation leaves the social-salience account partly unresolved.
“Thus, it appears that we failed to generate a positive affective cue with the MSC condition.”
Lower confidence on Positioning — domain match limited.
No concerns4 of 4 checks
The reported sample sizes, coefficients, confidence intervals, tables, and narrative conclusions are internally aligned. Confirmatory and exploratory analyses are clearly separated, with no statistical impossibilities or concealed outcome changes identified.
Prospective registration, ethics approval, informed consent, protocol deviations, exclusions, and public data and code availability are declared. The disclosed lack of supervisor blinding to the social-contact condition does not create a conduct concern because treatment allocation remained blinded and the primary outcome was computer-recorded.
Flags: 5 declared / 5 total
63 of 63 checkable references verified
68 references in manuscript 5 have no canonical index record — counted, but not index-checkable 2 references confirmed by manual review
No retraction notice found in Retraction Watch.
Sources: Retraction Watch ✓
Medium3.0
The study addresses an actively contested question for oxytocin, social-neuroscience, and behavioural-economics researchers. Its relevance is primarily academic because the paper does not identify a practitioner or organisation able to act directly on the result.
“the literature suffers from a lack of direct replications.”
The confirmed result comes from a controlled trust-game experiment and mainly constrains a mechanistic hypothesis. It does not establish an intervention pathway, while the potentially actionable subgroup effect remains post hoc and underpowered.
“This post hoc finding… yields a statistical power of 60%.”
The two-site sample and location sensitivity analysis provide evidence beyond a single laboratory. Generalizability remains bounded by the sample of young healthy male students, one intranasal dose, and one incentivized trust-game paradigm.
“a total of 677 student participants aged 18–25 yr.”
The study directly answers gaps identified by prior critical reviews and provides power and design guidance for confirmatory subgroup research. It therefore forms a strong cumulative research node even though it is not close to a practice recommendation.
“confirmation of this exploratory finding and a focus on sufficiently powered, preregistered studies”
Lower confidence on Generalizability — domain match limited.
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