Hi Buffheart.
Here is some information about Myoclonus and Tardive Dyskinesia from "We Move".
http://www.wemove.org/td/
Tardive Dyskinesia
http://www.wemove.org/td/td.html
Tardive Dyskinesia - Definition
http://www.wemove.org/myo/
Myoclonus
http://www.wemove.org/myo/myo.html
Overview - Myoclonus
I'll also post the one for Dystonia.
http://www.wemove.org/dys/dys.html