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Brain gyrification in wild and domestic canids: Has domestication changed the gyrification index in domestic dogs?

Grewal, Jagmeet S., Gloe, Tyler, Hegedus, Joseph, Bitterman, Kathleen, Billings, Brendon K., Chengetanai, Samson, Bentil, Sarah, Wang, Victoria X., Ng, Johnny C., Tang, Cheuk Y. , Geletta, Simon, Wicinski, Bridget, Bertelson, Mads, Tendler, Benjamin C., Mars, Rogier B., Aguirre, Geoffrey K., Rusbridge, Clare, Hof, Patrick R., Sherwood, Chet C., Manger, Paul R. and Spocter, Muhammad A. (2020) Brain gyrification in wild and domestic canids: Has domestication changed the gyrification index in domestic dogs? Journal of Comparative Neurology.

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Abstract

Over the last 15 years, research on canid cognition has revealed that domestic dogs possess a surprising array of complex socio‐cognitive skills pointing to the possibility that the domestication process might have uniquely altered their brains; however, we know very little about how evolutionary processes (natural or artificial) might have modified underlying neural structure to support species‐specific behaviors. Evaluating the degree of cortical folding (i.e., gyrification) within canids may prove useful, as this parameter is linked to functional variation of the cerebral cortex. Using quantitative magnetic resonance imaging to investigate the impact of domestication on the canine cortical surface, we compared the gyrification index (GI) in 19 carnivore species, including six wild canid and 13 domestic dog individuals. We also explored correlations between global and local GI with brain mass, cortical thickness, white and grey matter volume and surface area. Our results indicated that GI values for domestic dogs are largely consistent with what would be expected for a canid of their given brain mass, although more variable than that observed in wild canids. We also found that GI in canids is positively correlated with cortical surface area, cortical thickness and total cortical grey matter volumes. While we found no evidence of global differences in GI between domestic and wild canids, certain regional differences in gyrification were observed.

Item Type: Article
Divisions : Faculty of Health and Medical Sciences > School of Veterinary Medicine
Authors :
NameEmailORCID
Grewal, Jagmeet S.
Gloe, Tyler
Hegedus, Joseph
Bitterman, Kathleen
Billings, Brendon K.
Chengetanai, Samson
Bentil, Sarah
Wang, Victoria X.
Ng, Johnny C.
Tang, Cheuk Y.
Geletta, Simon
Wicinski, Bridget
Bertelson, Mads
Tendler, Benjamin C.
Mars, Rogier B.
Aguirre, Geoffrey K.
Rusbridge, Clarec.rusbridge@surrey.ac.uk
Hof, Patrick R.
Sherwood, Chet C.
Manger, Paul R.
Spocter, Muhammad A.
Date : 27 June 2020
DOI : 10.1002/cne.24972
Additional Information : Article is on publisher's website, but in pre-print. Final version forthcoming.
Depositing User : James Marshall
Date Deposited : 09 Jul 2020 15:38
Last Modified : 09 Jul 2020 15:38
URI: http://epubs.surrey.ac.uk/id/eprint/858171

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