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 structurally fixed, with neural circuits established during critical periods of development. However, research over the past two decades has demonstrated that the brain remains malleable throughout life, adapting to experience, learning, and even injury. This plasticity occurs at multiple levels, from synaptic strengthening to cortical remapping, enabling individuals to acquire new skills or recover functions after damage. 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 promising avenues for rehabilitation, it also has limits; certain functions, such as language acquisition, are more plastic in childhood, and pathological plasticity can contribute to chronic pain or phantom limb sensations. Thus, the brain's adaptability is a double-edged sword, requiring balanced interventions to harness its benefits.