While one hand stabilizes the base, the other hand is involved in adjusting angles and heights. While one hand manipulates the tool, the other hand is involved in stabilizing the fitting. This type of preparatory motor activity serves to facilitate bilaterality throughout the trunk, and sets up the upper extremities to work in bilateral patterns as well. Notice that the entire body is involved in creating the bilateral motor patterns and in stabilizing the body around the core, in much the same way as shown with the silhouettes.
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