Power Analysis and Data Analysis in Cross-National Multi-Lab Studies: Lessons Learned from the Many Smiles Collaboration + Philosophy of Science Reflections

Marco Tullio Liuzza,“Magna Graecia” University of Catanzaro”

2023-05-26

Preamble

I blame/credit (depends on the beholder) ChatGPT4 for the title

More details here: https://chat.openai.com/c/c9c1fc78-e4d1-46d2-9138-abf27db0f560

The facial feedback hypothesis

The famous pen-in the mouth task

The facial feedback hypothesis failure to replicate

Wagenmakers et al. (2016) conducted a pre-registered replication across 17 labs using a similar procedure as Strack et al. (1988).

Meta-analysis from Coles et al.

The Many Smiles collaboration

Adversarial collaboration led by Nicholas Coles aimed to :

  1. Specify when effect should most reliably emerge.

  2. Determine best way to test those beliefs.

  3. Design and execute an international multi-lab experiment

The Many Smiles study: how did I get there?

  • Things (often) happen by chance

    • but networking increases chance (tip for ECRs!)