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 relatively fixed, with neural circuits established during critical periods of development. However, research over the past few decades has demonstrated that the brain remains malleable throughout life, adapting in response to learning, experience, and even injury. This plasticity occurs at multiple levels, from synaptic strengthening and pruning to larger-scale cortical remapping. For instance, individuals who lose their sight often show enhanced tactile and auditory processing, as visual cortical areas are recruited for other sensory modalities. While this adaptability offers remarkable potential for rehabilitation after stroke or trauma, it also underscores the importance of environmental enrichment and lifelong learning in maintaining cognitive health. Nevertheless, plasticity is not inherently positive; maladaptive changes, such as chronic pain or phantom limb sensations, can arise from aberrant neural rewiring.