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 structurally 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, adapting to new experiences, learning, and even injury. 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 following damage. While this adaptability is generally beneficial, it also has a downside: maladaptive plasticity can contribute to chronic pain or phantom limb sensations. Therefore, therapeutic interventions increasingly aim to harness positive plasticity while minimizing negative outcomes, for instance through targeted cognitive training or non-invasive brain stimulation.