The central functions of the ego were traditionally seen as reality-testing, impulse-control, judgment, affect tolerance, defence, and synthetic functioning. An important conceptual revision to Freud's structural theory was made when Heinz Hartmann argued that the healthy ego includes a sphere of autonomous ego functions that are independent of mental conflict. Memory, motor coordination, and reality-testing, for example, ought to be able to function without the intrusion of emotional conflict. According to Hartmann, psychoanalytic treatment aims to expand the conflict-free sphere of ego functioning. By doing so, Hartmann believed, psychoanalysis facilitates adaptation, that is, more effective mutual regulation of ego and environment.