The BTPI (Ben-Gurion University Test for Perception of Illusions) is a validated tool which measure the susceptibility and sensitivity for three visual illusions of size - The Ponzo, the Ebbinghaus, and the Height-width illusions.
In order to obtain the experiment and related materials, and collect your own results, you will need to open a (free) Gorilla account and then to "clone" the BTPI to your account. You will then be able to "Preview" the BTPI and collect your results for later analysis (download the CSV version of your results).
Analysis R code and instructions are available at https://osf.io/qcmwu/
Built with Experiment
Gorilla Open Materials Attribution-NonCommerical Research-Only
Built with Experiment
Gorilla Open Materials Attribution-NonCommerical Research-Only
Fully open! Access by URL and searchable from the Open Materials search page
