This folder should contain the preprocessing scripta. Each experiment should
have one (and only one, ideally) .R file, named in the standard way.
If there is an experiment called "urntask", for instance, the
corresponding preprocessing script should be called preprocess_urntask.R.
The preprocessing script should read data files from the raw data folder within the relevant experiment (e.g., ./experiments/exp_urntask/data) but should not write anything to that folder. The only thing it should do is generate the clean data file, e.g. ./data/data_urntask.csv