Case Study 2: The "Power Posing" Journey — From Lab to TED Talk to Replication Crisis

The Original Finding

In 2010, Dana Carney, Amy Cuddy, and Andy Yap published a paper in Psychological Science titled "Power Posing: Brief Nonverbal Displays Affect Neuroendocrine Levels and Risk Tolerance."

The study claimed that holding "high-power" body positions (standing tall, arms spread, taking up space) for just two minutes caused measurable changes in hormone levels: increased testosterone (the "dominance hormone") and decreased cortisol (the "stress hormone"). Participants who held power poses also showed greater risk tolerance in a gambling task.

The sample size was 42 participants (21 per condition).

What the researchers claimed: Two minutes of expansive body posture cause hormonal changes that make you feel more powerful and take more risks.

The TED Talk Explosion

In 2012, Amy Cuddy delivered a TED talk titled "Your Body Language May Shape Who You Are." It became one of the most-watched TED talks in history, accumulating over 70 million views. Cuddy presented power posing as a transformative technique: stand in a power pose for two minutes before a job interview, a presentation, or any high-stakes situation, and you will feel more confident and perform better.

The talk was emotionally compelling. Cuddy shared her own story of overcoming self-doubt and presented power posing as a free, accessible tool that anyone could use. The message was simple and empowering: your body can change your mind.

What the mutation pipeline produced: - Original: "Expansive postures may affect hormone levels in a small lab study" - TED talk: "Power posing changes your hormones and transforms your confidence" - Media: "Strike a Power Pose Before Your Next Interview!" - Social media: "Power posing is scientifically proven to make you more successful" - Audience: "I should power pose before anything important"

The Replication Attempts

The first signs of trouble came quickly. Multiple labs tried to replicate the hormonal findings:

Ranehill et al. (2015): A sample of 200 participants (nearly five times the original). Found no effect of power posing on testosterone or cortisol levels. Did find a small effect on self-reported feelings of power — but not on behavior.

Garrison et al. (2016): Failed to replicate the hormonal effects.

A series of additional studies (2016–2018): Consistently failed to replicate the hormonal and behavioral effects. The self-report effects (feeling more powerful) sometimes replicated, but these are susceptible to demand characteristics — participants may report feeling powerful simply because the experimenter positioned them in poses labeled "powerful."

The Co-Author's Response

In 2016, Dana Carney — the first author of the original paper — posted a public statement on her faculty webpage stating that she no longer believed the power posing effect was real. She wrote:

"I do not believe that 'ichpower pose' effects are real... The evidence against the existence of power posing effects is undeniable."

She listed the methodological problems with the original study: small sample, lack of proper corrections for multiple comparisons, and the influence of researcher degrees of freedom.

This was extraordinary. A lead author publicly disavowing their own published finding is rare in science. Carney's honesty was widely praised in the research community — and largely ignored by the popular media, which had already absorbed power posing as an established fact.

Amy Cuddy's Position

Cuddy disagreed with Carney's assessment. She argued that while the hormonal effects might not replicate, the self-report effects (feeling more confident) were real and meaningful. She published a book (Presence, 2015) that expanded the power posing concept into a broader framework.

This created an unusual situation: one co-author saying the effect isn't real, while another says it is (though in a modified form). The scientific community largely sided with Carney based on the replication evidence, but the TED talk — with its 70 million views — continued to spread the original, stronger version of the claim.

Where It Stands Now

As of the mid-2020s, the scientific consensus is:

• Hormonal effects of power posing: not supported. Multiple large-scale replications have failed to find the testosterone and cortisol changes claimed in the original study.
• Behavioral effects (risk-taking, performance): not reliably supported. Some studies find small effects, but the literature is inconsistent and likely affected by publication bias.
• Self-report effects (feeling more powerful): possibly real but small, and may be attributable to demand characteristics rather than a genuine mind-body connection.
• The "two minutes of power posing will transform your confidence" claim: not supported by the evidence as a whole.

Verdict: "Power posing for two minutes changes your hormones and boosts your confidence" ❌ DEBUNKED (hormonal and behavioral effects) / ⚠️ OVERSIMPLIFIED (feeling effects) — The hormonal claims from the original 2010 study have failed to replicate across multiple large-scale attempts. One of the original co-authors publicly retracted her support. Small self-report effects may exist but are likely inflated by demand characteristics. The TED talk version — that two minutes of posing transforms your biochemistry and performance — is not supported. Origin: Carney, Cuddy, & Yap (2010). Replication status: Hormonal effects failed to replicate (Ranehill et al., 2015; Garrison et al., 2016; others). First author publicly retracted support (2016).

The Pipeline Lesson

Power posing is a perfect illustration of the pipeline at its most efficient — and most distorting:

The asymmetry between the original claim's reach and the correction's reach is the pipeline's most damaging feature. The original claim reached 70 million people through a single TED talk. The correction reached science enthusiasts who read Slate or follow replication news. The net result: millions of people believe in an effect that the research community no longer supports.

Discussion Questions

1. Amy Cuddy's TED talk is still available with 70+ million views. Should TED add a disclaimer? Should the talk be removed? What are the arguments for and against each option?

2. Dana Carney's public retraction was unusual and courageous. What incentives discourage researchers from publicly disavowing their own findings? How could the incentive structure be changed to make corrections more common?

3. The self-report effects of power posing (feeling more powerful) may be real. Is it valuable to practice power posing if it makes you feel more confident, even if it doesn't change your hormones or behavior? Where is the line between a useful psychological trick and a debunked claim?

4. If you had to explain the power posing story to someone who swears by it, how would you do it without triggering identity-protective cognition? What approach minimizes defensiveness?