Cogprints: No conditions. Results ordered Title. 2018-01-17T14:22:17ZEPrintshttp://cogprints.org/images/sitelogo.gifhttp://cogprints.org/2008-11-02T09:59:35Z2011-03-11T08:57:13Zhttp://cogprints.org/id/eprint/6253This item is in the repository with the URL: http://cogprints.org/id/eprint/62532008-11-02T09:59:35ZEffects of Lateral Hypothalamic Lesions on Placentophagia in Virgin, Primiparous, and Multiparous RatsLesions of the lateral hypothalamus (LH) were produced in pregnant and nonpregnant female rats through chronically implanted electrodes to investigate the effect of LH damage on placentophagia. Other variables investigated were prior parturitional experience and stimulus properties of the placenta. Lesions were produced under ether anesthesia 24 hr. prior to parturition in pregnant females and 24 hr. prior to placenta presentation in nonpregnant females.
The LH lesions produced aphagia to a liquid diet. Pregnancy was not a significant variable in the initiation of placentophagia, but prior parturitional experience was a critical variable. Virgin and primiparous females did not exhibit placentophagia following LH damage, but multiparous females would eat placenta whenever the opportunity arose, independently of LH damage and pregnancy.Dr. Mark B. Kristalkristal@buffalo.edu2008-10-16T13:50:02Z2011-03-11T08:57:12Zhttp://cogprints.org/id/eprint/6218This item is in the repository with the URL: http://cogprints.org/id/eprint/62182008-10-16T13:50:02ZThe effects of strain, reproductive condition, and strain of placenta donor on placentophagia in nonpregnant miceThe effects on placentophagia of strain, reproductive condition, and strain of placenta donor were observed in nonpregnant mice. Mice of the C57BL/6By and BALB/cBy strains were exposed to placentas of either strain after either no previous parturitional experience, one parturitional experience without nursing experience, or one parturitional experience with nursing experience. There was a significant effect of strain, a significant effect of reproductive condition, but no significant effect of strain of placenta donor. There was a significant interaction between strain and reproductive condition, but no significant interactions with placenta strain. It was inferred that the ability of a mouse to acquire and utilize relevant stimuli during and after parturition, in order to produce an emancipation of placentophagia from the physiological controls associated with parturition, is influenced by genotype.Dr. Mark B. Kristalkristal@buffalo.eduChristina L. Williams2001-06-26Z2011-03-11T08:54:43Zhttp://cogprints.org/id/eprint/1638This item is in the repository with the URL: http://cogprints.org/id/eprint/16382001-06-26ZEscape, hiding and freezing behaviour elicited by electrical stimulation of the chick diencephalonIntroduction:
An escape, hide and freeze (EHF) system has been plotted in the chick diencephalon and compared with that described in mammals, with particular reference to the defensive threat and fleeing system described for the cat. It is largely medially distributed and supra-threshold stimulation at different sites in the core of this system can elicit a mix of these behaviours. (These EHF behaviours can also be elicited peripherally. These results emerged from a broadly based study of CNS sites that were investigated for their potential to support electrical self-stimulation.)
Results:
1/ The EHF system starts in the rostral anterior hypothalamus and runs backward through the medial dorsal hypothalamus.
2/ A lateral extension occurs at the entry of the hypothalamic component of the Tractus occipito-mesencephalicus (TOM).
3/ Posterior to this TOM junction the system shows a ventral extension, but this does not include the N. ventromedialis: it coincides instead with medial and periventricular fibres.
4/ The preoptic area, lateral hypothalamic and mamillary areas were all free of EHF sites.
Conclusions:
a - The EHF system thus corresponds well with the distribution of the defensive escape-threat system in mammals.
b - In both mammals and birds similar behaviour can be elicited from both the diencephalic escape system and the central mesencephalic gray. The two are probably connected in the bird by periventricular routes, part of which can be identified by EHF sites.
c - The discussion also refers to other properties of the EHF system such as its role in vocalisation and activation by non-reinforcement.
Andrew Oades2007-10-22T10:42:43Z2011-03-11T08:56:59Zhttp://cogprints.org/id/eprint/5774This item is in the repository with the URL: http://cogprints.org/id/eprint/57742007-10-22T10:42:43ZFood and water intake prior to parturition in the ratFood and water intakes were measured in pregnant rats to determine whether parturition is preceded by significant changes in food and water intake. Three diets of different palatability and caloric value were used. Over the last 5 days of pregnancy, pregnant rats were found to ingest more calories/day than nonpregnant rats, and females with prior parturitional experience (multiparous) ingested more than virgin or primiparous females. Pregnant rats also ingested significantly greater amounts of fluid when compared to nonpregnant rats, and multiparous rats (pregnant or not) ingested greater amounts of fluid than did virgin or primiparous rats. On the last day of pregnancy, the intake of solid foods or a liquid diet did not change significantly, but the intake of either water or 5% sucrose was significantly reduced.Mark B. Kristalkristal@buffalo.eduRichard S. Wampler2001-08-30Z2011-03-11T08:54:46Zhttp://cogprints.org/id/eprint/1771This item is in the repository with the URL: http://cogprints.org/id/eprint/17712001-08-30ZThe illusion of beautynoneNicholas K Humphrey2011-12-16T00:58:07Z2011-12-16T00:58:07Zhttp://cogprints.org/id/eprint/7753This item is in the repository with the URL: http://cogprints.org/id/eprint/77532011-12-16T00:58:07ZOn Adjoint Dynamical SystemsTransformations of dynamical systems and organismic structures are discussed in terms of adjoint, simple adjoint and weak adjoint functors of organismic supercategories during development and evolution of organisms on markedly different timescales. A representation of nuclear transplants in terms of adjoint functors and a novel interpretation of nuclear transplant experiments is proposed. Three new theorems are proven for adjoint dynamical systems representing multi-potent developing cells and additional results are obtained for weak adjoint systems such as differentiated (specialized) cells.Prof. Dr. I. C. BaianuicbProf.Dr. Dragos Scripcariu2001-08-30Z2011-03-11T08:54:47Zhttp://cogprints.org/id/eprint/1783This item is in the repository with the URL: http://cogprints.org/id/eprint/17832001-08-30ZStatus and the left cheeknoneNicholas K. HumphreyI. Christopher McManus