medium · 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 to the site of an injury and repaired the damage there instantaneously
- replaced each of the neurons that were lost during the brain's childhood development
- enabled the brain to continue operating even in the absence of a hippocampus
- completely rebuilt every circuit in the brain from entirely new cells
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