Data from: Diffusion tensor imaging of dolphin brains reveals direct auditory pathway to temporal lobe
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 abo...
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ftdans:oai:easy.dans.knaw.nl:easy-dataset:89735 2023-07-02T03:33:52+02:00 Data from: Diffusion tensor imaging of dolphin brains reveals direct auditory pathway to temporal lobe Berns, Gregory S. Cook, Peter F. Foxley, Sean Jbabdi, Saad Miller, Karla L. Marino, Lori 2015-06-09T17:29:33.000+02:00 http://nbn-resolving.org/urn:nbn:nl:ui:13-nc-6275 https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:89735 unknown doi:10.5061/dryad.51s8h/1 doi:10.5061/dryad.51s8h/2 doi:10.1098/rspb.2015.1203 PMID:26156774 http://nbn-resolving.org/urn:nbn:nl:ui:13-nc-6275 doi:10.5061/dryad.51s8h https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:89735 OPEN_ACCESS: The data are archived in Easy, they are accessible elsewhere through the DOI https://dans.knaw.nl/en/about/organisation-and-policy/legal-information/DANSLicence.pdf Life sciences medicine and health care 2015 ftdans https://doi.org/10.5061/dryad.51s8h/110.5061/dryad.51s8h/210.1098/rspb.2015.120310.5061/dryad.51s8h 2023-06-13T13:19:27Z 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. Other/Unknown Material toothed whales Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen) |
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Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen) |
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Life sciences medicine and health care |
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Life sciences medicine and health care Berns, Gregory S. Cook, Peter F. Foxley, Sean Jbabdi, Saad Miller, Karla L. Marino, Lori Data from: Diffusion tensor imaging of dolphin brains reveals direct auditory pathway to temporal lobe |
topic_facet |
Life sciences medicine and health care |
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. |
author |
Berns, Gregory S. Cook, Peter F. Foxley, Sean Jbabdi, Saad Miller, Karla L. Marino, Lori |
author_facet |
Berns, Gregory S. Cook, Peter F. Foxley, Sean Jbabdi, Saad Miller, Karla L. Marino, Lori |
author_sort |
Berns, Gregory S. |
title |
Data from: Diffusion tensor imaging of dolphin brains reveals direct auditory pathway to temporal lobe |
title_short |
Data from: Diffusion tensor imaging of dolphin brains reveals direct auditory pathway to temporal lobe |
title_full |
Data from: Diffusion tensor imaging of dolphin brains reveals direct auditory pathway to temporal lobe |
title_fullStr |
Data from: Diffusion tensor imaging of dolphin brains reveals direct auditory pathway to temporal lobe |
title_full_unstemmed |
Data from: Diffusion tensor imaging of dolphin brains reveals direct auditory pathway to temporal lobe |
title_sort |
data from: diffusion tensor imaging of dolphin brains reveals direct auditory pathway to temporal lobe |
publishDate |
2015 |
url |
http://nbn-resolving.org/urn:nbn:nl:ui:13-nc-6275 https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:89735 |
genre |
toothed whales |
genre_facet |
toothed whales |
op_relation |
doi:10.5061/dryad.51s8h/1 doi:10.5061/dryad.51s8h/2 doi:10.1098/rspb.2015.1203 PMID:26156774 http://nbn-resolving.org/urn:nbn:nl:ui:13-nc-6275 doi:10.5061/dryad.51s8h https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:89735 |
op_rights |
OPEN_ACCESS: The data are archived in Easy, they are accessible elsewhere through the DOI https://dans.knaw.nl/en/about/organisation-and-policy/legal-information/DANSLicence.pdf |
op_doi |
https://doi.org/10.5061/dryad.51s8h/110.5061/dryad.51s8h/210.1098/rspb.2015.120310.5061/dryad.51s8h |
_version_ |
1770273991444922368 |