Explaining on Instagram: "When brain cells form a new connection, they don’t rebuild themselves from scratch. Instead, they change their structure in subtle ways. Neurons can grow new tiny branches, called dendritic spines, which allow them to connect to other cells. The strength of these connections can also increase, making signals travel more efficiently. At the same time, unused connections can fade away. Whole neurons usually don’t regenerate in most parts of the brain, but in certain regio