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the claim
The human brain has been shrinking in size over recent millennia
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
4 sources for · 0 against

Multiple anthropological and evolutionary studies support the finding that human brain volume has decreased over recent millennia, specifically since the end of the last Ice Age.

Evidence for · 4
When and Why Did Human Brains Decrease in Size? A New Change-Point Analysis and Insights From Brain Evolution in Ants
2021 · cited by 61
States human brains have decreased in volume since the end of the last Ice Age.
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The analysis

Judged against the evidence record for claims of this kind.

More for · 3
Human brains have shrunk: the questions are when and why
2023 · cited by 17
Reaffirms human brain size reduction from the Late Pleistocene/Holocene to modern day.
Did the transition to complex societies in the Holocene drive a reduction in brain size? A reassessment of the DeSilva et al. (2021) hypothesis
2022 · cited by 9
Discusses the hypothesis and data regarding a reduction in brain size during the Holocene.
Wikipedia: Recent human evolution
cited by 0
Reference article covering this claim directly
Everything we examined (12)
  1. Wikipedia: Human brainreferenceno side takennot shown: read and judged not to bear on this claim
  2. Wikipedia: Recent human evolutionreferencesupports
  3. Book: Cyber-Humansreferencesupportsnot shown: a book whose author and subject did not establish authority here
  4. Book: Handbook of Applied Dog Behavior and Training, Adaptation and Learningreferenceno side takennot shown: read and judged not to bear on this claim
  5. Book: Dementiareferenceno side takennot shown: read and judged not to bear on this claim
  6. Book: Annual Editionsreferenceno side takennot shown: read and judged not to bear on this claim
  7. OpenAIRE: A noninvasive, continuous brain monitoring method: rheoencephalography (REG)peer-reviewedno side takennot shown: read and judged not to bear on this claim
  8. OpenAIRE: Ultramicroscopy – Imaging a Whole Animal or a Whole Brain with Micron Resolutionpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  9. OpenAIRE: Interobserver reliability of rheumatologists performing musculoskeletal ultrasonography: results from a EULAR ''Train the trainers'' coursepeer-reviewedno side takennot shown: read and judged not to bear on this claim
  10. When and Why Did Human Brains Decrease in Size? A New Change-Point Analysis and Insights From Brain Evolution in Antspeer-reviewedsupports
  11. Human brains have shrunk: the questions are when and whypeer-reviewedsupports
  12. Did the transition to complex societies in the Holocene drive a reduction in brain size? A reassessment of the DeSilva et al. (2021) hypothesispeer-reviewedsupports
The paper trail · every fact has a biography
first checked05 Aug 2026
judged → SUPPORTED · 8605 Aug 2026
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