Two files: **code.zip** contains the source code needed to reproduce the experiment, and **instructions.zip** contains the instructions that were given to participants before the start of each experiment part.
We used Matlab in combination with the [Psychtoolbox][1]. If you do not have access to Matlab, you can also use [GNU Octave][2] (I haven't tested that though). If you want to run the experiment, extract all files in **code.zip** into any folder, and run the function vsl_experiment() at the Matlab or Octave command line. The "stimuli" folder needs to be a subfolder of the directory containing the .m files.
[1]: http://psychtoolbox.org
[2]: https://www.gnu.org/software/octave/