easy · LSAT Reading Comprehension
In discussions of adult neurogenesis, researchers say a newly generated neuron has become 'functionally integrated' only when it has done more than simply appear in the brain. Specifically, the cell must form synaptic connections with the brain's existing neural circuits and begin contributing to ongoing processes such as learning and memory. The hippocampus, where much of this neurogenesis occurs, is the principal site at which such integration is studied.
According to the passage, for a new neuron to be 'functionally integrated' means that it has:
- linked up with established neural networks and begun taking part in the brain's working processes
- traveled directly to the precise site of an injury and fully repaired all the damage there instantly
- replaced, one for one, each neuron that had been lost during the brain's earlier childhood development
- enabled the brain to continue operating normally even in the complete absence of any hippocampus
- completely rebuilt every last circuit throughout the brain, reconstructing them all from new cells
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