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Correlation of hippocampal theta rhythm with changes in cutaneous temperatureA possible role for the hippocampus in alerting an animal to changes in cutaneous temperature was examined. Following local warming or cooling of the ears of unanesthetized, loosely restrained rabbits, theta waves (4-7 Hz EEG waves) were recorded from electrodes straddling the hippocampus. The onset of the hippocampal theta rhythm was correlated with changes in cutaneous temperature, an observation consistent with studies indicating that the theta rhythm is a nonspecific response evoked by stimulation of several sensory modalities. Additional data from cats and rabbits were correlated with specific neurons within the hippocampus, namely pyramidal cells. Post stimulus time histograms obtained by excitation of the dorsal fornix were interpreted in terms of excitatory and inhibitory inputs to pyramidal cells. Thus, the theta rhythm, which appears to be evoked by changes in cutaneous temperature, can be related to a specific type of hippocampal neuron which is in turn connected with other areas of the brain involved in temperature regulation.
Document ID
19740022348
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Horowitz, J. M.
(California Univ. Davis, CA, United States)
Saleh, M. A.
(California Univ. Davis, CA, United States)
Karem, R. D.
(California Univ. Davis, CA, United States)
Date Acquired
September 3, 2013
Publication Date
January 1, 1974
Subject Category
Biosciences
Report/Patent Number
NASA-CR-139527
Accession Number
74N30461
Funding Number(s)
CONTRACT_GRANT: NGR-05-004-099
CONTRACT_GRANT: HO-6686
CONTRACT_GRANT: NGL-05-004-031
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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