Odontocete brain tissues associated with auditory processing are hypertrophied and modified relative to their terrestrial counterparts. The relationship between the functional demand on these tissues and metabolic substrate requirements is unknown. Using positron emission tomography (PET), relative cerebral blood flow was measured in a bottlenose dolphin. Approximately 60 mCi was administered to the dolphin via a catheter inserted into the hepatic vein and threaded proximate to the vena cava. Radiolabel initially appeared as distributed focal points in the cerebellum. Increasing scan time resulted in an increase in the number of focal regions and in the diffusivity of label activity throughout the brain. The time course and spatial distribution of radiolabel was consistent with a cerebral blood supply dominated by the spinal meningeal arteries. Blood flow was predominantly observed in the cerebellum and neocortex, particularly the auditory and visual cortex. Differential brain glucose uptake, previously measured in a separate dolphin, showed good agreement with the differential supply of blood to brain tissues. Rates of blood supply and glucose uptake in the auditory cortex, inferior colliculus, and cerebellum are consistent with a high metabolic demand of tissues which are important to the integration of auditory and other sensory inputs.
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September 2010
September 03 2010
Relationship of blood flow and metabolism to acoustic processing centers of the dolphin braina)
Dorian S. Houser;
Dorian S. Houser
c)
National Marine Mammal Foundation
, 2240 Shelter Island Drive, San Diego, California 92106
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Patrick W. Moore;
Patrick W. Moore
National Marine Mammal Foundation
, 2240 Shelter Island Drive, San Diego, California 92106
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Shawn Johnson;
Shawn Johnson
National Marine Mammal Foundation
, 2240 Shelter Island Drive, San Diego, California 92106
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Betsy Lutmerding;
Betsy Lutmerding
National Marine Mammal Foundation
, 2240 Shelter Island Drive, San Diego, California 92106
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Brian Branstetter;
Brian Branstetter
National Marine Mammal Foundation
, 2240 Shelter Island Drive, San Diego, California 92106
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Sam H. Ridgway;
Sam H. Ridgway
National Marine Mammal Foundation
, 2240 Shelter Island Drive, San Diego, California 92106
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Jennifer Trickey;
Jennifer Trickey
G2 Software Systems Inc.
, 10650 Scripps Ranch Boulevard, #228, San Diego, California 92110
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James J. Finneran;
James J. Finneran
US Navy Marine Mammal Program,
SSC Pacific, San Diego
, Code 71510, 53560 Hull Street, San Diego, California 92152
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Eric Jensen;
Eric Jensen
US Navy Marine Mammal Program,
SSC Pacific, San Diego
, Code 71510, 53560 Hull Street, San Diego, California 92152
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Carl Hoh
Carl Hoh
University of California
, San Diego, California 92103
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c)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
a)
This work was presented at the 5th Animal Sonar Symposium, Kyoto, Japan, 14–18 September 2009.
J. Acoust. Soc. Am. 128, 1460–1466 (2010)
Article history
Received:
January 12 2010
Accepted:
May 11 2010
Citation
Dorian S. Houser, Patrick W. Moore, Shawn Johnson, Betsy Lutmerding, Brian Branstetter, Sam H. Ridgway, Jennifer Trickey, James J. Finneran, Eric Jensen, Carl Hoh; Relationship of blood flow and metabolism to acoustic processing centers of the dolphin brain. J. Acoust. Soc. Am. 1 September 2010; 128 (3): 1460–1466. https://doi.org/10.1121/1.3442572
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