When babies engage in physical activity or use language, some synaptic connections in their brain will be strengthened, while the unused connections are replaced by other pathways or disappear. A neuroscientist would identify this process as "."

Pruning

Explanation: Pruning is generally regarded as the removal of unwanted or infectious part of a tree or flower.

However, to a neuroscientist, it is also quite similar because Pruning could be described as learning, when a child learns or utilizes what is learnt, the synaptic neurons responsible are strengthened, while the unused starts to degrade. Pruning is described as the replacement or disappearance of degraded synaptic connections or pathways. It is so called synaptic Pruning.