雅思阅读

📖 Reading Passage

The concept of 'neuroplasticity' has revolutionized our understanding of the human brain. Traditionally, scientists believed that the adult brain was hardwired and immutable after a critical period in childhood. However, recent research demonstrates that the brain retains the remarkable ability to reorganize its neural pathways throughout life. This plasticity is not merely a passive response to injury but is actively driven by learning, experience, and environmental enrichment. For instance, studies on London taxi drivers reveal that their posterior hippocampus, a region associated with spatial navigation, is significantly larger than that of control subjects, and this enlargement correlates with the number of years spent navigating complex city streets. Such findings suggest that the brain's structure is continuously shaped by cognitive demands. Yet, plasticity has its limits; it diminishes with age and can be impaired by chronic stress or neurodegenerative diseases. Understanding these constraints is crucial for developing effective rehabilitation strategies for stroke victims or patients with traumatic brain injuries.