Turning an infant's head to one side produces extension of the limbs on the face side and flexion on the skull side. Persistence of this response beyond infancy MOST suggests:

• 1 A peripheral nerve injury affecting the brachial plexus
• 2 A musculoskeletal contracture at the shoulder and elbow
• 3 Failure of normal central nervous system maturation ✓ 정답
• 4 Normal development that continues throughout childhood

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