This paper makes a proposal on the psychophysiological study of personality, characterized by the articulation of physiological, behavioral and subjective discourses, in the perspective of the descriptive, the explanatory and the predictive aims of personality theory. A definition of a trait is proposed, based not only on persistency but on the concordant configuration of features in the three methodical discourses of the psychophysiological enterprise. Studies on the augmenting-reducing dimension are commented in view to their relevance for an integrative theory of behavior.