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Rochat and Bullinger use such examples to make the imaginative theoretical suggestion that, in normal development, gaining control over posture will ordinarily enable the expression of a basic repertoire of innately coordinated actions. The starting point for development need not be characterized in terms of primitive reflexes; there also exist complex coordinations, which await control over posture for their expression. Further support for this position comes from infants whose postural development is delayed. Infants whose hips must be placed in plaster casts because of congenital malformations are delayed in acquiring autonomous control of sitting. One consequence of lack of control over the hips and trunk, which provide a stable platform for reaching, is delay in the development of reaching (Kohen-Raz, 1977).