Sum total of all brain's neurons and the connections between them. The stronger the pathway becomes, the more likely this pathway will be activated in the future.

• A. Localization
• B. Neural network
• C. Neuroplasticity
• D. Cortical remapping

Answer: (B)

Think of the brain as a neural network—the whole system of neurons and the connections between them. The phrase “sum total of all brain's neurons and the connections between them” points to this network structure. When a pathway is used more, the connections along that route strengthen, so that pathway becomes more likely to fire again in the future. That idea—learning through changing connection strengths within a network—embodies how a neural network operates in the brain. While other terms touch on related ideas (specific brain areas, reorganization after injury, or the brain’s general capacity to change), they don’t capture the description of the brain as an interconnected system of neurons and synapses whose strengthened pathways guide future activation as directly as neural network does.