PONTILE SYNCHRONIZATION OF THE HIPPOCAMPAL AND LATERAL HYPOTHALAMIC EEG: SPECTRAL CORRELATES OF AN EVOKED STATE.
Item
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Title
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PONTILE SYNCHRONIZATION OF THE HIPPOCAMPAL AND LATERAL HYPOTHALAMIC EEG: SPECTRAL CORRELATES OF AN EVOKED STATE.
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Identifier
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AAI8401960
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identifier
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8401960
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Creator
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TENKE, CRAIG E.
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Contributor
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Prof. Lloyd Gilden
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Date
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1983
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Language
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English
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Publisher
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City University of New York.
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Subject
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Psychology, Physiological
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Abstract
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The anatomical pathways relating the hippocampus (HIP) and the lateral hypothalamus (LH) are well documented. Previous studies have not, however, established the degree to which they serve as a reliable transmission route for slow wave activity. The stability of the shared spectral properties of the EEGs of the dorsal HIP and the LH was therefore assessed using stimulation-induced (theta) as a spectrally distinct tracer.;Rats were restrained in a device incorporating a modified form of the Bellingham (1980) restraint bag. Data records were screened by means of a novel frequency domain artifacting procedure based on the defining characteristics of the power spectrum. In order to evaluate the differences between the stimulated and ambient EEGs, both the enhancement of power at the frequency of the emergent spectral peak and the suppression of the remaining (nonpeak) frequencies in the (theta) range were then tested by nonparametric methods.;Synchronous (theta) activity was varied by electrical stimulation of the dorsal pons. Maximal HIP rhythmicity was attained for sites in the diffuse subcoeruleus region. The frequency of the elicted peak was found to be significantly and positively correlated with ventral displacements of the stimulation site.;In the LH, gross (theta) activity was rarely sharply defined. Even so, changes in activity tended to be statistically predictable. For group data, peak enhancement and nonpeak suppression effects obtained significance in both HIP and LH power spectra, as well as in the coherence of the two signals. Individual data reproduced this pattern in a fashion that varied from measure to measure. The data suggest that the coherence of the two EEGs is directly related to the prominence of (theta) in the LH. A similar correspondence between the hippocampal EEG and coherent or total LH activity was not supported.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Psychology
