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The upper panel illustrates movements towards the mouth performed by the same infant at 1, 2, 3, 4, 8 and 12 months of age. The lower panel represents reaching movements towards the object at 4, 8 and 12 months of age by the same child. The origin of the referring system (0,0) indicates the position of the target. Measurement unit for both X and Y displacements is the length of the humerus bone.
