How does the brain know which connection to keep?

The brain determines which neural connections to keep through a process called synaptic plasticity, which is influenced by factors like experience, learning, and repetition. Connections that are frequently activated are strengthened, while those that are rarely used may weaken or be eliminated in a process known as synaptic pruning. Neurotransmitter activity and signaling pathways also play crucial roles in this selection process, ensuring that the brain optimally adapts to new information and experiences. Overall, this dynamic adjustment enhances cognitive efficiency and learning.