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Dynamically, we may differentiate between motility (1) as an urge, a factor in object relations, and a source of pleasure (id aspects); (2) as a form of reality testing, mastery, communication, and integration (ego); and (3) as relating to the ultimate formation of conscience and ideals (superego aspects).
From the point of view of maturation and relation to the environment, we may differentiate between movement and action. The former predominates in the intrauterine or pregravitational period as well as in the first six months of the postnatal or gravitational period.