This project contains the open methods/scripts/data from the paper "Grasping follows Weber's Law: How to use response variability as a proxy to JND" by Kriti Bhatia, Christian Löwenkamp and Volker H. Franz, published in Journal of Vision in 2022. - The folders "data-0*" contain the raw data from the four experiments analyzed in the paper: 1. data-01-Experiment1 contains new data from Experiment 1 of Bhatia et al. (2022). 2. data-02-Loewenkamp2015 contains trial-by-trial data from Löwenkamp et al. (2015). 3. data-03-Heath2011 contains aggregated data from Table 1 of Heath et al. (2011). 4. data-04-Ganel2008 contains data of Ganel et al. (2008) which was digitised from figures of Ganel et al. (2008) and Westwoood & Goodale (2011). - The R scripts "an-data-0*" process and analyze the corresponding data set. They can be sourced directly and print out all relevant results. - The R file "lib-weber" contains the functions used by the analysis scripts. - In the paper, we obtained and analyzed full participant-data for Ganel et al. (2008) that we obtained via personal correspondence from Tzvi Ganel, but here that full data is not published because it is not openly available, rather here we publish only the aggregated data digitised from figures. - Before sourcing, please ensure all the required packages and libraries are installed (check lib-weber.R for packages to install).