雅思阅读

📖 Reading Passage

The concept of 'neuroplasticity' has revolutionized our understanding of the human brain. Traditionally, scientists believed that the brain's structure was relatively fixed after childhood. However, recent research demonstrates that the brain remains remarkably adaptable throughout life, forming new neural connections in response to learning, experience, or injury. This adaptability is not uniform; it is most pronounced during critical periods in early development but continues at a reduced level in adulthood. For instance, individuals who lose their sight often show enhanced auditory or tactile processing, as the brain reallocates resources from the visual cortex to other senses. This phenomenon has significant implications for rehabilitation and education, suggesting that targeted training can harness plasticity to improve cognitive functions, even in older adults. Nevertheless, the mechanisms underlying plasticity are complex, involving synaptic strengthening, dendritic growth, and even the generation of new neurons in specific regions like the hippocampus.