What is the significance of neural redundancy?

• A. It reduces the brain's resilience to injury
• B. It eliminates the need for plastic changes after injury
• C. It imposes a larger energy cost without benefits
• D. It allows functional preservation after neuronal loss

Answer: (D)

Neural redundancy is the presence of overlapping or parallel circuits that can support the same function. This setup provides a backup system so that if some neurons or pathways are lost to injury or disease, other routes can carry out the same task, helping to maintain behavior and perception. After injury, the brain often reweights and reorganizes connections through plastic changes, drawing on these spare circuits to compensate. So the main significance is functional preservation despite neuronal loss. The other ideas miss this resilience or ignore the need for plastic adaptation, and while redundancy can incur energy costs, the benefit is robust function after damage.