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 largely fixed, with neural circuits becoming rigid after a critical period in childhood. However, recent research demonstrates that the brain remains malleable 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, where functions such as movement or sensation can shift to adjacent brain regions after damage. Such adaptability underpins cognitive rehabilitation strategies for stroke victims and informs educational practices that leverage the brain's inherent flexibility. Nevertheless, plasticity is not unlimited; it declines with age and is influenced by genetic and environmental factors, highlighting the delicate balance between stability and adaptability in neural systems.