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21 Jul 2026SCIENCE & TECHNOLOGY3 questions

New Neurons After Seventy: The Evidence That Revived a Sixty-Year Argument

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Article summary

Research from the Karolinska Institutet, published in Science, has provided some of the strongest evidence yet that new neurons continue to form in the adult human brain. The team analysed human hippocampal tissue from birth through adulthood using single-nucleus RNA sequencing, then applied machine learning to identify cells bearing the proliferation marker Ki67, validating the result through flow cytometry and spatial transcriptomic techniques that localised the cells to the dentate gyrus. Neural progenitor cells were found in adults, including individuals in their seventies. A striking finding was the extent of variation between individuals: some adults carried many progenitor cells and others had almost none. The work bears on a debate running since the 1960s over whether the adult human brain generates neurons at all, a question with implications for memory, mood disorders and neurodegeneration.

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recallTests whether you read the article and retained key facts.
1Q
applicationTests whether you can apply the concept to a new scenario.
1Q
analysisTests whether you can reason across multiple related facts.
1Q

Sample questions — answers revealed after test

SCIENCE & TECHNOLOGYRecallEasy

Q1. The term adult neurogenesis, as studied in the recent research, refers to which of the following?

AThe regeneration of severed peripheral nerves in the limbs after injury.
BThe generation of new neurons in the brain during adulthood, notably in the hippocampus.
CThe strengthening of connections between existing neurons through learning.
DThe programmed death of surplus neurons during early brain development.
Answer revealed after you submit the test
SCIENCE & TECHNOLOGYApplicationMedium

Q2. The new study is described as providing further evidence for adult neurogenesis and reviving a long-standing debate rather than settling it. Which one of the following best explains why a single study does not close such a scientific question?

ABecause scientific claims are established by the reputation of the institution rather than by evidence.
BBecause a finding must be reproducible and consistent with the wider body of evidence before it is accepted, and conflicting prior studies mean the question remains contested until the weight of evidence converges.
CBecause a single study can never use valid methods.
DBecause adult neurogenesis has already been conclusively disproved, so no evidence could revive it.
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SCIENCE & TECHNOLOGYAnalysisHard

Q3. Consider the following statements about the adult-neurogenesis research: 1. The hippocampus is a brain region strongly associated with learning and the formation of new memories. 2. Modern approaches such as single-cell sequencing and machine-learning analysis allowed researchers to look for signatures of newly formed neurons that older methods could not resolve. 3. If adult hippocampal neurogenesis is confirmed in humans, it would have no conceivable relevance to conditions such as depression or neurodegenerative disease. Which of the statements given above are correct?

A1 and 2 only
B1 only
C2 and 3 only
D1, 2 and 3
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