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Neuropsychologia. 2016 Dec;93(Pt B):325-334. doi: 10.1016/j.neuropsychologia.2016.04.003. Epub 2016 Apr 4.

Sex differences in the relationship between planum temporale asymmetry and corpus callosum morphology in chimpanzees (Pan troglodytes): A combined MRI and DTI analysis.

Author information

1
Neuroscience Institute and Language Research Center, Georgia State University, Atlanta, GA 30302, USA; Division of Developmental and Cognitive Neuroscience, Yerkes National Primate Research Center, Atlanta, GA 30329, USA. Electronic address: whopkins4@gsu.edu.
2
Division of Developmental and Cognitive Neuroscience, Yerkes National Primate Research Center, Atlanta, GA 30329, USA.
3
Department of Psychology, Georgia State University, Atlanta, GA 30302, USA.
4
Neuroscience Institute and Language Research Center, Georgia State University, Atlanta, GA 30302, USA.
5
Department of Veterinary Science, The University of Texas MD Anderson Cancer Center, Bastrop, TX 78602, USA.
6
Department of Psychology, Trinity University, San Antonio, TX 78212, USA.

Abstract

Increases brain size has been hypothesized to be inversely associated with the expression of behavioral and brain asymmetries within and between species. We tested this hypothesis by analyzing the relation between asymmetries in the planum temporale (PT) and different measures of the corpus callosum (CC) including surface area, streamline count as measured from diffusion tensor imaging, fractional anisotropy values and the ratio in the number of fibers to surface area in a sample of chimpanzees. We found that chimpanzees with larger PT asymmetries in absolute terms had smaller CC surface areas, fewer streamlines and a smaller ratio of fibers to surface area. These results were largely specific to male but not female chimpanzees. Our results partially support the hypothesis that brain asymmetries are linked to variation in corpus callosum morphology, although these associations may be sex-dependent.

KEYWORDS:

Brain asymmetry; Corpus callosum; Planum temporale; Primates

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