easy · LSAT Reading Comprehension
A new neuron does not contribute to brain function the moment it appears. The author explains that any therapy aiming to harness neurogenesis would have to support a complex chain of events: the cell must survive, then migrate to its proper location, then differentiate into the right type of neuron, and finally integrate by forming connections with existing circuits. A failure at any of these stages leaves the new cell useless.
According to the passage, the complex sequence of events a new neuron must complete in order to survive and function consists of
- staying alive, moving to its location, becoming the proper neuron type, and joining existing circuits
- replicating itself, evolving into a new form, and ultimately replacing the entire adult hippocampus structure
- absorbing surrounding nutrients, dividing very rapidly, and then chemically stimulating the cells around it
- passing through animal-model testing, then human clinical trials, and finally formal regulatory approval
- surviving, then migrating, then differentiating, after which integration into circuits occurs automatically
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