easy · LSAT Reading Comprehension
Recent research on adult neurogenesis has shown that producing new neurons is only the beginning. For a newly generated neuron to become 'functionally integrated,' it must clear a demanding sequence of hurdles: it has to survive long enough, travel to the appropriate location within the brain, and then establish synaptic connections with the neurons already present in the existing circuitry. A neuron that fails at any of these stages contributes nothing to brain function.
According to the passage, which one of the following is a complex requirement for new neurons to become 'functionally integrated'?
- They must remain isolated from the rest of the brain's existing neural circuitry, joining nothing.
- They must persist, travel to the right place, and link up synaptically with the neurons already in place.
- They must immediately replace, entirely on their own, every single neuron lost to a traumatic injury.
- They must turn out markedly larger and far more durable than the neurons that are produced during childhood.
- They must succeed at survival and migration while never needing to form any new synaptic connections.
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