Project Overview

In this ongoing project we investigate a fundamental aspect of human nature: evaluating others’ actions as praiseworthy or blameworthy. We do so in a closely coordinated, multi-laboratory, standardized study aimed at replicating the helping/hindering finding reported by (Hamlin, Wynn, & Bloom, 2007). Using a video-taped version of the original puppet show, labs from around the world will collect data from infants between the ages of 5.5 and 10.5 months.

Project Leads


We encourage everyone who is interested in the project to contact the Project Leads (see above) or fill out the MB Sign-Up Form.

Please note that access to infants/infant lab is NOT a prerequisite.


Lucca, K.*, Yuen, F.*, Capelier-Mourguy, A., Cirelli, L., Byers-Heinlein, K., Dal Ben, R., Frank, M. C., Henderson, A. M. E., Kominsky, J. F., Liberman, Z., Margoni, F., Reschke, P. J., Schlingloff, L., Scott, K., Soderstrom, M., Sommerville, J., Su, Y., Tatone, D., Uzefovsky, F., Wang, Y., & Hamlin, J. K. (Stage 1 Registered Report, In Principle Acceptance). Infants’ Social Evaluation of Helpers and Hinderers: A Large-Scale, Multi-Lab, Coordinated Replication Study. Developmental Science. (*co-first authors) PsyArXiv. doi:10.31234/

to cite, use (Lucca & Yuen et al., accepted pending data collection)

Spin-off Projects