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• W4247114965 abstract "The literature dealing with the behavioral effects produced by ablation of the septum and related medial cortical structures in a large number of species (including rodents, carnivores, and primates) is reviewed. Relevant neuroanatomical and electrophysiological data are included when they lend support to a point of view or when they clarify a point of information. It is concluded that septal function cannot be explained in terms of a unitary mechanism, but rather there appears to be a functional anatomical localization within the septum. The posteroventral septum modulates water intake via possible efferents to the supraoptic and paraventricular nuclei, which in turn controls neurosecretion at the neurohypophysis. Increases in water intake and deficits in passive avoidance after septal ablation are not related. The lateral septal nuclei and their afferent connections with the hippocampus and diencephalic connections with the hypothalamus exert control over the formation of conditioned emotional responses. Deficits in passive avoidance and one-way active avoidance, and facilitation in two-way active avoidance after septal ablation are most parsimoniously explained in terms of decreased “fear.” This hypothesis is supported by both behavioral and endocrinological data. The medial septal nucleus and its connections with fields CA1, CA2, and CA3 of the hippocampus regulate motor mechanisms. Overresponding on various operant schedules and deficits in alternation and reversal problems are specific to damage to the medial septal nucleus and are highly correlated with abolition of the hippocampal theta rhythm. An inability to efficiently utilize response-produced proprioceptive feedbac, rather than a response disinhibition model, appears to be the best hypothesis available for an explanation of these deficits. The role of the septum in stimulus processing is also reviewed, and a physiological mechanism for hyperreactivity to sensory stimuli often observed after septal ablation is discussed. Finally, it is hypothesized that the cingulate gyrus is probably not involved in response facilitation but rather with the organization of sequential behavior." @default.
• W4247114965 created "2022-05-12" @default.
• W4247114965 date "1994-12-01" @default.
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• W4247114965 title "Developments in alloy powders for high performance structural applications" @default.
• W4247114965 doi "https://doi.org/10.1016/0026-0657(94)90643-2" @default.
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