雅思阅读

📖 Reading Passage

The concept of neuroplasticity has revolutionized our understanding of the brain's capacity for change. Historically, it was believed that the adult brain was structurally fixed, with neural circuits becoming immutable after a critical period in childhood. However, recent research demonstrates that synaptic connections can be strengthened or weakened in response to experience, and even new neurons can be generated in specific regions such as the hippocampus. This plasticity is not uniform across the lifespan; it declines with age but remains significant, particularly in learning and memory. Moreover, neuroplasticity has profound implications for rehabilitation after brain injury, as undamaged areas can sometimes assume functions of damaged ones. Yet, this adaptability is a double-edged sword, as maladaptive plasticity can contribute to chronic pain or phantom limb sensations. Understanding the mechanisms underlying such changes may lead to targeted therapies for neurological disorders, shifting the focus from merely treating symptoms to promoting structural brain repair.