How do sensory experiences strengthen some neural connections in childhood?

During early childhood, the brain undergoes a period of rapid development characterized by the formation of a vast number of synapses. At this stage, neurons sprout numerous branches, creating a surplus of connections that far exceeds the number found in an adult brain.12

Sensory experiences act as the primary mechanism for refining these networks. When the nervous system receives specific sensory inputs, the synapses associated with those inputs are reinforced and strengthened. Conversely, connections that do not receive consistent sensory stimulation fail to be reinforced and eventually weaken.12

This process culminates in "synaptic pruning," where unused or redundant synapses are eliminated. By removing these excess connections, the brain carves out efficient, specialized neural pathways. This developmental plasticity is essential during critical periods of childhood, as the brain relies on these environmental interactions to organize its structure and function properly.21