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Ecological Drivers of Dorsal Dentate Gyrus Folding and Hemispheric Asymmetry in Wild Octodon: New Insights from Sobrero et al. (2016)
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Introduction: We reanalyzed data from Sobrero et al. [Brain Behav Evol. 2016;87:51–64] to evaluate dorsal dentate gyrus (dDG) folding or gyrification as a morphological proxy for neurogenesis and macrostructural plasticity in hippocampal or extracortical regions of wild rodents. Methods: Using Zilles’ (ZGI) and Vogeley’s (VGI) indices, we quantified dDG gyrification across hemispheres in Octodon degus and Octodon lunatus, comparing populations that differ in habitat complexity and social behavior. Results: Left dDG gyrification (ZGIL) showed a preliminary association with social group size, whereas right dDG gyrification (VGIR) was predicted by population differences. O. lunatus from shrub-dense environments exhibited greater dDG folding than O. degus from open habitats. Although not statistically significant, hemispheric asymmetries were suggested, consistent with previously reported right-lateralized DG cell numbers in O. lunatus and habitat-sociality effects on DG cell counts in O. degus from El Salitre. Conclusion: These results support dDG gyrification as an informative marker of neural plasticity shaped by habitat conditions and emphasize the value of wild models in brain-ecology research.
Title: Ecological Drivers of Dorsal Dentate Gyrus Folding and Hemispheric Asymmetry in Wild Octodon: New Insights from Sobrero et al. (2016)
Description:
Introduction: We reanalyzed data from Sobrero et al.
[Brain Behav Evol.
2016;87:51–64] to evaluate dorsal dentate gyrus (dDG) folding or gyrification as a morphological proxy for neurogenesis and macrostructural plasticity in hippocampal or extracortical regions of wild rodents.
Methods: Using Zilles’ (ZGI) and Vogeley’s (VGI) indices, we quantified dDG gyrification across hemispheres in Octodon degus and Octodon lunatus, comparing populations that differ in habitat complexity and social behavior.
Results: Left dDG gyrification (ZGIL) showed a preliminary association with social group size, whereas right dDG gyrification (VGIR) was predicted by population differences.
O.
lunatus from shrub-dense environments exhibited greater dDG folding than O.
degus from open habitats.
Although not statistically significant, hemispheric asymmetries were suggested, consistent with previously reported right-lateralized DG cell numbers in O.
lunatus and habitat-sociality effects on DG cell counts in O.
degus from El Salitre.
Conclusion: These results support dDG gyrification as an informative marker of neural plasticity shaped by habitat conditions and emphasize the value of wild models in brain-ecology research.
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