Torfs, K., Vancleef, K., Lafosse, C., Wagemans, J., & de-Wit, L. (2014). The Leuven Perceptual Organization Screening Test (L-POST), an online test to assess mid-level visual perception. BEHAVIOR RESEARCH METHODS, 46(2), 472-487. https://doi.org/10.3758/s13428-013-0382-6