File:Specimens of an analysis on human brain size over 9.8-million-years.jpg

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English: "Original dataset from DeSilva et al. (2021). Residuals from the regression are heavily skewed and heteroscedastic, and the temporal intervals between samples ranges from 2.85 million years to 100 years. Of the total of 987 total specimens in this 9.85 Ma analysis, 578 are in the final 100-year interval. Also shown is fitted regression lines from a linear model with 95% confidence intervals around the slope; changepoints were found using segmented R package at 2.1 ± 0.1 Ma, 1.3 ± 0.1 Ma, and respective slopes of 0.03 ± 0.01, 0.35 ± 0.04, 0.14 ± 0.13 surrounding changepoints. No changepoint was located at or around 3 ka that approached significance using Davies (1987) test after accounting for previously mentioned changepoints (p-value of any additional changepoints = 0.621)."
Date
Source https://www.frontiersin.org/articles/10.3389/fevo.2022.963568/full
Author Authors of the study: Brian Villmoare and Mark Grabowski

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Captions

From the study "Did the transition to complex societies in the Holocene drive a reduction in brain size? A reassessment of the DeSilva et al. (2021) hypothesis"

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6 June 2022

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current21:16, 27 August 2022Thumbnail for version as of 21:16, 27 August 2022829 × 468 (175 KB)PrototyperspectiveUploaded a work by Authors of the study: Brian Villmoare and Mark Grabowski from https://www.frontiersin.org/articles/10.3389/fevo.2022.963568/full with UploadWizard
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