雅思阅读

📖 Reading Passage

The concept of neuroplasticity has revolutionized our understanding of the human brain. Historically, scientists believed that the adult brain was largely fixed in structure and function after a critical period in childhood. However, recent research demonstrates that the brain retains the remarkable ability to reorganize itself throughout life. This adaptability occurs through processes such as synaptic strengthening, the formation of new neural connections, and even the generation of new neurons in specific regions like the hippocampus. Neuroplasticity is not merely a passive response to injury; it is also actively engaged during learning and memory formation. For instance, London taxi drivers, who must memorize complex city layouts, exhibit increased gray matter volume in the posterior hippocampus compared to controls. This finding suggests that sustained cognitive demands can physically alter brain structure. Nevertheless, the extent of plasticity varies with age, with younger brains generally showing greater flexibility. Understanding these limits is crucial for developing effective rehabilitation strategies for stroke victims and for designing educational programs that optimize learning at different life stages.