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 rigid after a critical period in childhood. However, research over the past two decades has demonstrated that the brain remains remarkably adaptable throughout life, capable of reorganizing its structure and function in response to experience, injury, or learning. This plasticity occurs at multiple levels, from synaptic strengthening between individual neurons to large-scale cortical remapping. For instance, studies on individuals who have lost a limb show that the corresponding cortical area becomes responsive to stimuli from adjacent body parts, suggesting a competitive process for neural territory. Moreover, environmental enrichment, such as engaging in complex cognitive tasks or physical exercise, has been shown to promote neurogenesis in the hippocampus, a region vital for memory. These findings carry profound implications for rehabilitation after brain damage and for educational practices, implying that targeted interventions can harness the brain's inherent flexibility to optimize recovery and learning across the lifespan.