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FIG 4. Proposed mechanisms of mirror movements.
A, Normal pathways.
B, Proposed mechanisms of mirror movements include bilateral signals originating at the pyramidal decussation, either by cross talk or by double branching fibers.
C, Deficiency at the decussation, resulting in development of accessory or double branched pathways inferiorly within the spinal cord.
D, Deficient contralateral cortical inhibition, resulting in the generation of bilateral cortical signals.
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