easy · LSAT Reading Comprehension
Through most of the twentieth century, scientists assumed that the architecture of the adult human brain was set once childhood ended, with no capacity to produce additional neurons. The discovery of adult neurogenesis upended that assumption by showing that the mature brain does, in fact, generate new neurons in certain regions. Subsequent work indicated that the human rate of such production is substantially lower than in rodents, and that environmental enrichment and exercise can significantly increase neurogenesis in animal models.
Which one of the following most accurately describes the significance of the discovery of adult neurogenesis as the passage presents it?
- It revealed that neurogenesis proceeds at a far higher rate in humans than in rodents.
- It established that environment and exercise exert no influence whatever on the rate of neuron production.
- It overturned the entrenched assumption that the adult human brain's structure was fixed and unable to produce new neurons.
- It proved that the brain can completely recover from any injury by automatically replacing the neurons it has lost.
- It confirmed that neurogenesis takes place uniformly throughout every region of the adult brain.
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