Cited by 175Advanced Neuroimaging Techniques and ApplicationsPrimate Behavior and EcologyNeural and Behavioral Psychology Studies

Virtual dissection and comparative connectivity of the superior longitudinal fasciculus in chimpanzees and humans

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Hecht, Erin E., Gutman, David A., Bradley, Bruce A., Preuss, Todd M., Stout, Dietrich·2015·NeuroImage

Abstract

Many of the behavioral capacities that distinguish humans from other primates rely on fronto-parietal circuits. The superior longitudinal fasciculus (SLF) is the primary white matter tract connecting lateral frontal with lateral parietal regions; it is distinct from the arcuate fasciculus, which interconnects the frontal and temporal lobes. Here we report a direct, quantitative comparison of SLF connectivity using virtual in vivo dissection of the SLF in chimpanzees and humans. SLF I, the superior-most branch of the SLF, showed similar patterns of connectivity between humans and chimpanzees, and was proportionally volumetrically larger in chimpanzees. SLF II, the middle branch, and SLF III, the inferior-most branch, showed species differences in frontal connectivity. In humans, SLF II showed greater connectivity with dorsolateral prefrontal cortex, whereas in chimps SLF II showed greater connectivity with the inferior frontal gyrus. SLF III was right-lateralized and proportionally volumetrically larger in humans, and human SLF III showed relatively reduced connectivity with dorsal premotor cortex and greater extension into the anterior inferior frontal gyrus, especially in the right hemisphere. These results have implications for the evolution of fronto-parietal functions including spatial attention to observed actions, social learning, and tool use, and are in line with previous research suggesting a unique role for the right anterior inferior frontal gyrus in the evolution of human fronto-parietal network architecture.

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Authors
Hecht, E. E., Gutman, D. A., Bradley, B. A., Preuss, T. M., & Stout, D.
Affiliations
  • Emory University (US)
  • University of Exeter (GB)
Corresponding author
Hecht, Erin E.
Venue
NeuroImage
Publisher
Elsevier BV
Published
2015-03
Volume
108
Pages
124-137
ISSN
1053-8119 (ISSN-L)
OpenAlex
W1994212787
Cited by
175
References
127
Citations by year
2026: 8 · 2025: 13 · 2024: 13 · 2023: 13 · 2022: 13 · 2021: 17 · 2020: 44 · 2019: 14 · 2018: 17 · 2017: 13 · 2016: 7 · 2015: 2
FWCI
5.74
Type
journal article
Language
en
Open access
Locations
  • NeuroImage (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Leverhulme Trust (F/00 144/BP)
  • Wenner-Gren Foundation Dissertation Fieldwork Grant and Osmundsen Initiative Award (7699)
  • The John Templeton Foundation (40463)
  • National Institutes of Health (RR-00165)
Topics
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
  • Social Sciences › Psychology › Social Psychology › Primate Behavior and Ecology
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
Keywords
superior longitudinal fasciculus, chimpanzees, human evolution, white matter connectivity, inferior frontal gyrus, dorsolateral prefrontal cortex, dorsal premotor cortex, hemispheric lateralization, arcuate fasciculus, comparative neuroanatomy
MeSH terms
Animals, Brain Mapping, Pan troglodytes, Dissection, Biological Evolution, Female, Frontal Lobe, Humans, Image Processing, Computer-Assisted, Male, Neural Pathways, Parietal Lobe, Diffusion Magnetic Resonance Imaging, White Matter

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