22 observed and derived physiological measures of skin resistance and conductance, heart action and blood pressure under conditions of rest and mild stress were obtained from 85 male college students. Factor analysis of the intercorrelations by the complete centroid method revealed 3 factors: conductance, heart period, and blood pressure. "The factorial structure offers strong support to the concept of specialized autonomic balance in place of the concept of generalized autonomic balance." (PsycINFO Database Record (c) 2006 APA, all rights reserved)