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).

A toddler participating in the task, with her point-of-gaze depicted as a blue dot
Example areas of interest (AOIs) used during the anticipatory period to distinguish looks to the "Target" region (where the chaser will reappear according to their action goal) and the "Distractor" region (covering the other tunnel exit and it's surroundings)


Tobias Schuwerk, Adrian Steffan, Lucie Zimmer

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


MB-ManyWebcams is currently collecting data.


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.