Influence of Sex and Handedness on Corpus Callosum in Capuchin Monkeys
Author Information
Author(s): Kimberley A. Phillips, Chet C. Sherwood, Alayna L. Lilak
Primary Institution: Hiram College
Hypothesis
Overall CC midsagittal area and regional subdivisions would be related to handedness in capuchins, with no sex effects present.
Conclusion
Adult female capuchins have a larger corpus callosum compared to males, and handedness influences corpus callosum morphology.
Supporting Evidence
- Adult females had a significantly larger corpus callosum: brain volume ratio than adult males.
- Left-handed individuals had a larger overall corpus callosum area than right-handed individuals.
- A significant sex and handedness interaction was found for anterior midbody.
Takeaway
This study found that girl capuchin monkeys have bigger brains than boy capuchins, and left-handed monkeys have different brain shapes than right-handed ones.
Methodology
Measurements of corpus callosum area were taken from MR images of capuchin monkeys, and hand preference was assessed through a bimanual task.
Potential Biases
Potential biases in hand preference assessment and MRI methodology.
Limitations
The study's sample size was small and limited to adult capuchin monkeys.
Participant Demographics
14 adult capuchin monkeys (6 males, 8 females) aged 1-21 years.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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