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The ability to stay on and ride a skateboard is primarily one of gaining balance on a moving object. Proprioception is the sense of balance which allows people to be aware of the body's position and movement, and to adjust the body to maintain balance. Match this with (D).

Expert Approach:
The question stem asks about the sensory system involved with a child learning to ride a skateboard and maintain balance. Quickly scanning the answer choices reveals that I'm looking for a type of sensory perception, not an area of the brain or a motor skill. Riding a skateboard requires awareness of body position and movement. This suggests the involvement of proprioception, the sense of balance and body awareness. With this prediction in hand, I choose (D).Alternatively, I could have attacked this question by evaluating each answer choice in terms of the type of perceptions essential to maintaining balance on a skateboard. Nociception is related to pain perception, and although pain might motivate the child when they fall, it should not be involved in the actual skill of riding the skateboard, so (A) is incorrect. Mechanoreception deals with pressure and vibration, which is tempting due to the child's physical contact with the skateboard, but it is not the main sense involved in maintaining balance, so (B) is incorrect. Somatosensation is a broad term for tactile stimuli, including touch, which is important for gripping the skateboard but, again, not the core sense used for balance, making (C) incorrect. Moreover, (B) and (C) are saying almost the same thing, and they can't both be right. Even without knowing the exact definition of "proprioception," knowing that skateboarding involves balance and coordinating body movements, not just touch or pain should lead me to (D).

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