The easiest way to get the above materials is to upload HandsOn.zip to "ContributedNotebooks" folder, and run the command ! unzip ./HandsOn.zip on a cell of a new notebook, from within the same folder.
Finally, navigate inside the decompressed HandsOn folder and run the notebook BasalGanglia.ipynb. Your results will be saved in your personal drive space and can be found in the "ContributedNotebooks" folder whenever you log in again to the app.