In 1980 Alberca et al. described a patient with a syndrome of increased muscle irritability, who presented ondulating muscle rolling movements and electrically silent cramps, myoedema and muscle reactions to mechanical stimulation similar to myotonic response, suggesting a disfunction at myofibrillar level.
For c-3po, it was a costume, Anthony Daniels played c-3po: For R2-D2, It was a costume and a remote controlled robot. CGI was also used in the prequel trilogy. So, they had Kenny Baker to play him : And from Portrayal section of wookieepedia article on R2-D2 :
Daniels voiced C-3PO in the Star Wars radio serial based on the original trilogy. He is the only cast member of the original Star Wars trilogy to voice his character in all three parts of NPR 's dramatisations of the trilogy.He voiced C-3PO for four animated series: Droids, Star Wars: Clone Wars, Star Wars: The Clone Wars, and Star Wars Rebels.aniels was the voice of Legolas in Ralph Bakshi âs 1978 animated adaptation of The Lord of the Rings. He has appeared intermittently on British television in various dramas, notably in a recurring role in Prime Suspect starring Helen Mirren.