This paper evaluates Kohut's selfobject concept by reviewing the historical context of its origin and the gradual substitution of an emphasis on experience for the ego psychological emphasis on function. When viewed as a dimension of experience, a selfobject experience has the affective quality of vitalization. This modification and extension of Kohut's original concept derives from infant research, especially Stern's revision of affect theory and Lichtenberg's concept of five motivational systems. The paper concludes with an application of the theory of selfobject experience to pathological states, especially those involving addiction.