easy · LSAT Reading Comprehension
In a discussion of adult neurogenesis, a passage stresses that newly generated neurons must do more than simply come into existence: they must survive, migrate to appropriate locations, differentiate into the correct cell types, and integrate into existing circuits before they can contribute to brain function.
The author most likely includes this detail in order to emphasize that:
- Producing new neurons is merely one step within a multi-stage process needed for functional brain repair.
- The adult human brain cannot meaningfully repair itself at all without some form of pharmacological aid.
- Rodents possess a markedly more sophisticated neuronal migration process than adult humans do in the hippocampus.
- Alzheimer's disease operates mainly by blocking newly formed neurons from migrating toward the hippocampus.
- Newly generated neurons reliably complete every stage in turn and thereby succeed in repairing the adult brain.
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