**ABSTRACT** By the end of their first year, infants are able to interpret many different types of complex dynamic visual events, such as caused-motion, chasing, and goal-directed action. The present work examined whether there are meaningful individual differences in infants' ability to represent dynamic causal events in visual scenes and whether these differences influence vocabulary development. As part of the longitudinal Language 0-5 Project, 78 10-month-old infants were tested on their ability to interpret three dynamic motion events, involving (a) caused-motion, (b) chasing behaviour, and (c) goal-directed movement. The infants showed evidence of understanding the first two event types, but not the third. Looking behaviour in each task was not meaningfully related to vocabulary development, nor were there any correlations between the tasks. The results of exploratory analyses and simulations further suggested that the infants' understanding of each event may not be predictive of their vocabulary development, and that looking times in these tasks may not be reliably capturing any meaningful individual differences in their knowledge. This raises questions about how to convert experimental group designs to individual differences measures, and how to interpret infant looking time behaviour. ---------- **OSF REPOSITORY GUIDE** This repository contains all of the supporting materials relating to the project. The "Language_05_Events_Vocab.zip" contains an RProject with the data and scripts needed to reproduce our analyses and manuscript. The manuscript and analyses/results are provided in "05_Events_Report.pdf" and "05_Events_Analysis.html", respectively. ---------- **ADDITIONAL INFORMATION** This research was conducted as part of the longitudinal [Language 0-5 project][1] at the ESRC LuCiD centre (www.lucid.ac.uk) at the University of Liverpool. ---------- **CONTACT** Correspondence regarding this project should be sent to [Andrew Jessop][2]. [1]: https://osf.io/kau5f/ [2]: http://osf.io/57kvw