Large Randomized Trial Finds Oxytocin Does Not Substantially Affect Empathy | Research

The takeaway

A randomized clinical trial found no substantial modulation of empathy-related brain or behavioral responses by intranasal oxytocin, challenging the popular narrative of oxytocin as the "empathy hormone."

Not the empathy hormone
A well-designed randomized trial found no substantial empathy enhancement from intranasal oxytocin — previous positive results may have been overblown by small studies

What the researchers found

Randomized clinical trial showed no substantial modulation of empathy-related behavioral or neural responses by intranasal oxytocin administration compared to placebo.

Why it matters

The "oxytocin = empathy" narrative has influenced research funding, therapeutic trials, and public understanding. This negative result recalibrates expectations and directs research toward oxytocin's actual effects rather than assumed ones.

The numbers in context

N=25 males; double-blind crossover; 3 empathy tasks; bilateral amygdala increase for physical pain only; OXTR rs53576 no interaction

How the study worked

Randomized controlled clinical trial. Intranasal oxytocin vs placebo. Empathy-related behavioral and brain response measures.

Who was studied

Male adults with autism spectrum disorder without intellectual disability

What this study cannot tell us

Single-dose acute study. Empathy measurement tools may not capture all aspects of social cognition. Oxytocin effects may be context-dependent or appear only in specific populations.

How to read the evidence

High evidence: randomized, controlled clinical trial with behavioral and neural measures. Important negative result.

When this study was published

Published 2021. Oxytocin research continues to be refined with larger, more rigorous trials.

The bigger picture

Oxytocin's effects are more nuanced than the popular narrative suggests. Rather than a simple "empathy booster," oxytocin may modulate social attention, salience, or context-dependent social processing in ways too complex for simple empathy tests to capture.

Questions still open

Does oxytocin affect social cognition through mechanisms other than empathy?
Were previous positive empathy results driven by small sample sizes and publication bias?
Would chronic oxytocin produce different empathy effects than a single dose?

Common questions

Does oxytocin really boost empathy?

Despite the popular "empathy hormone" label, this rigorous clinical trial found no substantial empathy enhancement from intranasal oxytocin. Previous positive results from smaller studies may have been inflated by publication bias and small sample sizes.

If not empathy, what does oxytocin actually do?

Oxytocin likely affects social processing in more subtle ways — modulating attention to social cues, stress responses, and context-dependent social behavior rather than simply boosting empathy. Its effects may be more apparent in specific populations (like ASD) than in healthy individuals.

Read the original research

Randomized clinical trial shows no substantial modulation of empathy-related neural activation by intranasal oxytocin in autism.

Scientific reports, 11(1), 15056

View on PubMed ↗Publisher’s paper ↗

Citation

Mayer, Annalina V; Wermter, Anne-Kathrin; Stroth, Sanna; Alter, Peter; Haberhausen, Michael; Stehr, Thomas; Paulus, Frieder M; Krach, Sören; Kamp-Becker, Inge. (2021). Randomized clinical trial shows no substantial modulation of empathy-related neural activation by intranasal oxytocin in autism.. Scientific reports, 11(1), 15056. https://doi.org/10.1038/s41598-021-94407-x