Prochazka A, Clarac F, Loeb GE, Rothwell JC, Wolpaw J. What do reflex and voluntary mean? Modern views on an ancient debate. Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale [Internet]. 2000;130:417?432. http://www.ncbi.nlm.nih.gov/pubmed/10717785