PT - JOURNAL ARTICLE AU - Madis Vasser AU - Markus Kängsepp AU - Murad Magomedkerimov AU - Kälver Kilvits AU - Vladislav Stafinjak AU - Taavi Kivisik AU - Raul Vicente AU - Jaan Aru TI - VREX: An Open-Source Toolbox for Creating 3D Virtual Reality Experiments AID - 10.1101/105858 DP - 2017 Jan 01 TA - bioRxiv PG - 105858 4099 - http://biorxiv.org/content/early/2017/02/15/105858.short 4100 - http://biorxiv.org/content/early/2017/02/15/105858.full AB - Background We present VREX, a free open-source Unity toolbox for virtual reality research in the fields of experimental psychology and neuroscience.Results Different study protocols about perception, attention, cognition and memory can be constructed using the toolbox. VREX provides a procedural generation of (interconnected) rooms that can be automatically furnished with a click of a button. VREX includes a menu system for creating and storing experiments with different stages. Researchers can combine different rooms and environments to perform end-to-end experiments including different testing situations and data collection. For fine-tuned control VREX also comes with an editor where all the objects in the virtual room can be manually placed and adjusted in the 3D world.Conclusions VREX simplifies the generation and setup of complicated VR scenes and experiments for researchers. VREX can be downloaded and easily installed from vrex.mozello.com