easy · LSAT Reading Comprehension
In describing adult neurogenesis, the neurogenesis passage explains that newly generated neurons in the hippocampus do not merely appear; they undergo "integration into existing circuits," forming working connections with the neurons already present. The passage stresses this point in the course of discussing what these new cells actually contribute to memory and learning.
The passage refers to the new neurons' "integration into existing circuits" primarily in order to:
- underscore that the new neurons become functioning participants in the brain's activity rather than inert additions.
- imply that the brain's established wiring must first be torn down entirely to make room for the incoming cells to grow.
- account for why the rate of neurogenesis proceeds far faster in adult rodents than it does in adult primates.
- contend that hippocampal neurons are structurally more elaborate and densely branched than neurons found elsewhere.
- explain how researchers were first able to detect, in living tissue, that new neurons were being produced at all.
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