雅思阅读

📖 Reading Passage

The concept of neuroplasticity has revolutionized our understanding of the brain's capacity for change. Historically, scientists believed that the adult brain was static, with neural circuits fixed after a critical period in childhood. However, recent research demonstrates that the brain remains malleable throughout life, adapting to experience, injury, and learning. This plasticity occurs at multiple levels, from synaptic strengthening to cortical remapping, enabling individuals to acquire new skills or recover functions after trauma. For instance, studies on London taxi drivers reveal enlarged hippocampi, a region associated with spatial navigation, correlating with their extensive route knowledge. While neuroplasticity offers therapeutic potential for conditions like stroke or depression, its limits remain debated, as not all brain regions exhibit equal flexibility, and genetic factors may constrain adaptive changes.