 Erik H. Erikson distinguished fixation to zone – oral or anal, for example – from fixation to mode, such as taking in, as with his instance of the man who "may eagerly absorb the 'milk of wisdom' where he once desired more tangible fluids from more sensuous containers".Eric Berne, developed his insight further as part of transactional analysis, suggesting that "particular games and scripts, and their accompanying physical symptoms, are based in appropriate zones and modes".Heinz Kohut saw the grandiose self as a fixation upon a normal childhood stage; while other post-Freudians explored the role of fixation in aggression and criminality.