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1There is a motor urge ("drive") in the same sense as there are oral, etc., urges ("drives"). This urge is present at all age periods but is the dominant urge at the beginning of the second year of life and remains dominant for several years.
2The period of most rapid development of motor functions (posture, locomotion, manipulation) coincides with dominance of the motor urge. In this sense we may speak of a motor phase of ego and libido development (organization).