Aggression, already explained in a discussion of Sears’ basic assumptions, is a natural consequence of frustration. Aggression readily becomes an early and vital aspect of learned behavior because frustration occurs from the very moment the infant experiences discomfort, or pain, and delay in finding relief from the unpleasant experience. Aggression, usually manifested through anger, in the form of rage or a display of temper, is primarily a response to this frustration. The young infant, or an older individual with an infant-like behavior reservoir, depends upon those processes of life communication most important for him. His aggression finds expression through a generalized vocal expression (crying), changes in rhythm of breathing or food intake, or his entire body posture. Permissiveness toward exhibitions of frustration has a different meaning for the child than does permissiveness toward dependency. Parental permissiveness toward displays of frustration fails to reinforce the behavior patterns, but it leaves the infant with unchanneled aggression. In contrast, permissive acceptance of dependency logically leads the child to further dependency on his caring adult. Simultaneously, permissive acceptance of dependency includes a readiness for doing for the child what he refuses to handle himself.