Answer:
synaptic pruning
Step-by-step explanation:
Synaptic pruning occurs as a natural process when childs grow , this means that the brain of a child progressively elminates extra synapses-and leads to a better organization and rearrangement for learning better new things.
The initial experiences gained during infancy years form connections that give a certain development or structure to the brain and with pruning connections unnecesary are eliminated.
This happens because they are not used enough, and the process beging since a baby is born , deep into adolescence and continues to the mid 20-s
The image below shows graphically the concept: