雅思阅读

📖 Reading Passage

The concept of 'neuroplasticity' has revolutionized our understanding of the human brain. Historically, scientists believed that the adult brain was largely fixed, with neural circuits becoming immutable after a critical period in childhood. However, recent research demonstrates that the brain retains a remarkable capacity for reorganization throughout life. This adaptability is driven by synaptic strengthening and the formation of new neural pathways in response to learning, experience, or even injury. For instance, individuals who lose their sight often exhibit enhanced tactile or auditory processing, as cortical areas normally devoted to vision are recruited for other senses. While neuroplasticity offers hope for rehabilitation after stroke or trauma, its limits remain a subject of debate. Over-stimulation or maladaptive plasticity can lead to chronic pain or phantom limb sensations, suggesting that the brain's flexibility is a double-edged sword.