In this multi-lab methodological project, we try to validate an open source, web-based, eye-tracking method for research on cognitive development in young children. More specifically, we evaluate whether this method, which is based on WebGazer.js (Papoutsaki et al., 2016) and jsPsych (de Leeuw, 2015), is comparable to lab-based eye-tracking. Therefore, we aim to replicate findings of an in-lab paradigm of the ManyBabies2 project, which revealed spontaneous goal-directed action anticipation in toddlers using commercial eye-tracking systems (Schuwerk, Kampis et al., 2021).


Tobias Schuwerk, Adrian Steffan, Lucie Zimmer

For a detailed index of collaborators (+ institutions, countries, studies), check the MB collaborator dashboard:



  • Materials, Protocols, and Documentation: Google Drive.
  • Listserv: join here. (Note: sign-up form is in German. To be subscribed directly, contact Tobias Schuwerk).
  • Slack: Please email any of the members of the leadership team to get a Join invitation.
  • News: MB-ManyWebcams news.


We encourage everyone who is interested in the project to contribute and/or contact the project leads by e-mailing: tobias.schuwerk [at], adrian.steffan [at], lucie.zimmer [at]

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