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dc.contributor.author Berns, Gregory S.
dc.contributor.author Cook, Peter F.
dc.contributor.author Foxley, Sean
dc.contributor.author Jbabdi, Saad
dc.contributor.author Miller, Karla L.
dc.contributor.author Marino, Lori
dc.date.accessioned 2015-06-09T15:29:33Z
dc.date.available 2015-06-09T15:29:33Z
dc.date.issued 2015-07-08
dc.identifier doi:10.5061/dryad.51s8h
dc.identifier.citation Berns GS, Cook PF, Foxley S, Jbabdi S, Miller KL, Marino L (2015) Diffusion tensor imaging of dolphin brains reveals direct auditory pathway to temporal lobe. Proceedings of the Royal Society B 282(1811): 20151203.
dc.identifier.uri http://hdl.handle.net/10255/dryad.89353
dc.description The brains of odontocetes (toothed whales) look grossly different from their terrestrial relatives. Because of their adaptation to the aquatic environment and their reliance on echolocation, the odontocetes' auditory system is both unique and crucial to their survival. Yet, scant data exist about the functional organization of the cetacean auditory system. A predominant hypothesis is that the primary auditory cortex lies in the suprasylvian gyrus along the vertex of the hemispheres, with this position induced by expansion of ‘associative′ regions in lateral and caudal directions. However, the precise location of the auditory cortex and its connections are still unknown. Here, we used a novel diffusion tensor imaging (DTI) sequence in archival post-mortem brains of a common dolphin (Delphinus delphis) and a pantropical dolphin (Stenella attenuata) to map their sensory and motor systems. Using thalamic parcellation based on traditionally defined regions for the primary visual (V1) and auditory cortex (A1), we found distinct regions of the thalamus connected to V1 and A1. But in addition to suprasylvian-A1, we report here, for the first time, the auditory cortex also exists in the temporal lobe, in a region near cetacean-A2 and possibly analogous to the primary auditory cortex in related terrestrial mammals (Artiodactyla). Using probabilistic tract tracing, we found a direct pathway from the inferior colliculus to the medial geniculate nucleus to the temporal lobe near the sylvian fissure. Our results demonstrate the feasibility of post-mortem DTI in archival specimens to answer basic questions in comparative neurobiology in a way that has not previously been possible and shows a link between the cetacean auditory system and those of terrestrial mammals. Given that fresh cetacean specimens are relatively rare, the ability to measure connectivity in archival specimens opens up a plethora of possibilities for investigating neuroanatomy in cetaceans and other species.
dc.relation.haspart doi:10.5061/dryad.51s8h/1
dc.relation.haspart doi:10.5061/dryad.51s8h/2
dc.relation.isreferencedby doi:10.1098/rspb.2015.1203
dc.relation.isreferencedby PMID:26156774
dc.subject dti
dc.subject dolphin
dc.subject auditory
dc.title Data from: Diffusion tensor imaging of dolphin brains reveals direct auditory pathway to temporal lobe
dc.type Article
dwc.ScientificName Delphinus delphis
dwc.ScientificName Stenella attenuata
prism.publicationName Proceedings of the Royal Society B

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Title Delphinus
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Description Diffusion files output from FSL bedpostX necessary for tractography. Also includes average structural image (trufi...) and B0 image as well as transform from B0 space to structural space.
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Title Stenella
Downloaded 16 times
Description Diffusion files output from FSL bedpostX necessary for tractography. Also includes structural image (trufi...) and B0 image.
Download Stenella.tar (717.1 Mb)
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