Thesis (M.S.)--University of Wisconsin--Madison, 1961. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 70-73).

Thesis (M.S.)--University of Wisconsin--Madison, 1963. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 28-44).

Thesis (Ph. D.)--Columbia University, 1927. / Vita. Published also as Comparative psychology monographs, vol. IV, serial no. 22. July, 1927. Bibliography: p. 56-58.

Thesis (Ph. D.)--University of Chicago, 1917. / "The Psychological monographs, vol. XXVI, whole no. 115." Bibliography: p. [49]-50.

Thesis--Copenhagen. / Literaturfortegnelse: p. [186]-191.

Thesis (Ph. D.)--State University of New York at Binghamton, Psychology Dept., 2005. / Includes bibliographical references.

Th.--Sci. phys.--Besançon, 1979. N°: 133.

The possibility that regions of the medial forebrain bundle-lateral hypothalamic area (MFB-LHA) are concerned with mediating the rewarding effect of electrical stimulation of the brain was examined by making unilateral injections of 2% procaine hydrochloride (2 ul) into this region during bar pressing for electrical stimulation in the septum or preoptic area. When the injection was made into the same side of the brain as the stimulating electrode, there was a strong suppression of self-stimulating rates as compared to the effect of isotonic saline injections, and the effect occurred with injections anywhere along the entire length of the MFH-LHA. The finding that the suppression was significantly less severe when the injections were made into the MFB-LHA on the side of the brain opposite to the electrode suggests that the suppression was not due to general disruptive effects. As a further control for nonspecific disturbances, similar injections were made in animals bar-pressing for food reward; the results showed that these injections suppressed bar-pressing for food but only when the injections were made into those regions of the MFB-LHA which have been shown to be involved in feeding behavior. These results suggest that the entire MFB-LHA is a part of a system mediating the rewarding effect of electrical stimulation of the septum and preoptic area. / Arts, Faculty of / Psychology, Department of / Graduate

The effects of chronic ingestion of technical dieldrin on reproduction in the rat were studied by determining the number of litters, the number and the viability of young born to animals exposed to dietary concentrations of 0, 13, 25, 37 and 53 ppm. Dieldrin had no effect on the reproductive success of the males. In the females dieldrin had no effect on fertility and did not significantly reduce litter sizes but evidence is presented which suggests the litter size reduction is real. Exposure of the dam during lactation reduces the survival of suckling young. It is suggested that the major cause of this mortality is acute poisoning from dieldrin secreted in the milk, although the growth responses of the young indicate that starvation resulting from decreased lactation may also be involved. None of the mortality is caused by increases in maternal aggression or neglect. Exposure during gestation alone also reduces the post-partum survival of young. The probable physiological mechanisms involved in the various effects are discussed. / Science, Faculty of / Zoology, Department of / Graduate

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