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921 results on '"Menon, Ravi S"'

139. Interspecies activation correlations reveal functional correspondences between marmoset and human brain areas.

Author

Yuki Hori, Cléry, Justine C., Selvanayagam, Janahan, Schaeffer, David J., Johnston, Kevin D., Menon, Ravi S., and Everling, Stefan

Subjects
MARMOSETS, CALLITHRIX jacchus, FUNCTIONAL magnetic resonance imaging, HUMAN beings, TEXTURE mapping
Abstract

The common marmoset has enormous promise as a nonhuman primate model of human brain functions. While resting-state functional MRI (fMRI) has provided evidence for a similar organization of marmoset and human cortices, the technique cannot be used to map the functional correspondences of brain regions between species. This limitation can be overcome by movie-driven fMRI (md-fMRI), which has become a popular tool for noninvasively mapping the neural patterns generated by rich and naturalistic stimulation. Here, we used md-fMRI in marmosets and humans to identify whole-brain functional correspondences between the two primate species. In particular, we describe functional correlates for the well-known human face, body, and scene patches in marmosets. We find that these networks have a similar organization in both species, suggesting a largely conserved organization of higher-order visual areas between New World marmoset monkeys and humans. However, while face patches in humans and marmosets were activated by marmoset faces, only human face patches responded to the faces of other animals. Together, the results demonstrate that higherorder visual processing might be a conserved feature between humans and New World marmoset monkeys but that small, potentially important functional differences exist. [ABSTRACT FROM AUTHOR]

Published
2021
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149. Persistent post-concussion brain changes in adolescent hockey players

Author

BrainsCAN, Western University, Manning, Kathryn Y., Schranz, Amy, Bartha, Robert, Dekaban, Gregory A., Barreira, Christy, Brown, Arthur, Fischer, Lisa, Asem, Kevin, Doherty, Timothy J., Fraser, Douglas D., Holmes, Jeff, and Menon, Ravi S.

Subjects
MRS, Brain trauma, Concussion, fMRI, Neurodevelopment, Neurosciences, Hyperconnectivity, DWI, MRI
Abstract

Changes continue to occur in a concussed brain even after standard clinical tests have returned to normal. Damage in the very long fibre tracks in the brain of concussed players can be detected up to three months after the concussion and after the individuals have been approved for return to athletics. It is also possible to detect ‘hyper-connectivity’ in the brain, suggesting the brain is still trying to compensate for the concussion. https://ir.lib.uwo.ca/brainscanresearchsummaries/1003/thumbnail.jpg

Published
2018

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