雅思阅读

📖 Reading Passage

The concept of 'neuroplasticity' has revolutionized our understanding of the human brain. Historically, scientists believed that the brain's structure was fixed after a critical period in childhood. However, recent research demonstrates that the brain remains malleable throughout life, adapting to new experiences, learning, and even injury. This adaptability occurs at multiple levels, from synaptic connections between neurons to larger-scale cortical reorganization. For instance, individuals who lose their sight often show enhanced auditory or tactile processing, as the visual cortex is recruited for other sensory modalities. While this plasticity offers hope for rehabilitation after stroke or trauma, it also has a downside: maladaptive plasticity can contribute to chronic pain or phantom limb sensations. Thus, the brain's capacity for change is a double-edged sword, presenting both opportunities and challenges for therapeutic interventions.