作者单位:Purdue Univ, Sch Elect & Comp Engn, W Lafayette, IN 47907 USA[1]Purdue Univ, Sch Ind Engn, W Lafayette, IN 47907 USA[2]Purdue Univ, Weldon Sch Biomed Engn, W Lafayette, IN 47907 USA[3]Indiana Univ Sch Med, Dept Neurol, Indianapolis, IN 46202 USA[4]Purdue Univ, Dept Basic Med Sci, W Lafayette, IN 47907 USA[5]