Thesis (M.S.)--University of Wisconsin--Madison, 1970. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1956. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 120-124).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1960. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1966. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Selective inhibition of 5-hydroxytryptamine by parachlorophenylalanine (PCPA) is able to restore sexual receptivity in female rhesus monkeys made unreceptive by bilateral adrenalectomy. PCPA in the doses used reduces the levels of 5-hydroxyindoleacetic acid (5HIAA) in the cerebrospinal fluid to 40 per cent of the normal oestradioltreated condition. Both the increased sexual receptivity and the lowered 5HIAA levels "in the CSF are in turn reversed by 5-hydroxytryptophal (5HTP), the irrmediate precursor of 5HT and the substance whose synthesis is inhibited by PCPA. 5HTP on its own reduces sexual receptivity and increases 5HIAA levels in the CSF of ovariectomised, oestradiol-treated (but otherwise intact) female rhesus monkeys. A substance other than an adrenal androgen has therefore been shown to restore sexual receptivity in adrenalectomised female monkeys . Testosterone propionate and oestradiol benzoate both lower the turnover rates of 5HT in the brains of ovariectomised female monkeys, as measured by the 2 hour probenecid test. Taken together, these findings suggest that adrenal androgens could act on specific sites in the female monkey brain via 5HT-containing neural systems, to control (or at least influence) sexual receptivity. All the results of administering oestradiol to ovariectomised monkeys in these experiments are consistent with the established roles of this hormone in female sexual attractiveness and in the gonadotrophin- controlling systems of the hypothalamo-hypophyseal axis. In contrast to these findings on 5HT and sexual receptivity in female monkeys, no clear role for 5HT- containing neural systems could be demonstrated in the grooming, aggressive or social behaviours of female monkeys. No clear role for 5HT could be demonstrated in the refractory period following ejaculation in male monkeys , or when testosterone replacement is given to castrated male monkeys.

Thesis (Ph.D.)--Boston University / PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you. / While memory function in primates depends on the integrity of the medial temporal lobe, the contribution of the hippocampal formation (HF) independent of the overlying ventromedial temporal cortices, particularly the entorhinal (ENT) and parahippocampal (PHG) cortices, remains unclear. To address this issue we have prepared groups of rhesus monkeys with ibotenic acid lesions of the HF or aspiration lesions of the ENT or PHG cortices. We then administered behavioral tasks to assess the effects of these lesions relative to normal controls. To test recognition memory, the Delayed Non-Matching to Sample (DNMS) task and the Delayed Recognition Span Task (DRST) were administered. On DNMS, all groups were impaired on both acquisition and 2 and 10 minute delays. The DRST, administered in Spatial, Color and Object conditions, yielded slightly different results. On the Spatial condition, all groups were impaired on both unique and repeated trials of the task. On the Color condition, all groups were impaired on unique trials while only the HF group was impaired on repeated trials. On the Object condition, ENT and PHG groups were only impaired on unique trials, while the HF group was unimpaired. To assess associative memory, two choice reversals were administered in Spatial (SR) and Object (OR) modalities. On the SR task, The HF group was impaired on acquisition and the first of three reversal phases. The ENT group was impaired on all three reversals, and the PHG group was impaired on only the last. On the OR task, HF animals were impaired on all reversals, while ENT animals were impaired on the initial reversal and PHG animals on the last two. These results indicate that damage to the HF alone causes impairments in recognition, spatial processing and object reversal learning. They also indicate that ENT and PHG regions make unique contributions to memory processes as seen in additional impairments on DRST and the inability to perform spatial reversals. Thus impairments previously attributed to hippocampal damage in studies where the ENT and PHG cortices were removed in conjunction with the HF need to be reevaluated in view of additional contributions provided by these cortical regions. / 2031-01-01

Behaving in a complex world requires flexible mapping between sensory inputs and motor outputs. One must be able to make decisions about what actions to take based on a wide variety of inputs. This presents a routing problem: brain areas involved in decision making must receive information encoded by different sensory neurons in different situations. In this thesis I investigate this routing problem using two variations of the random dot motion task which require flexible routing. In the first, a single random dot motion task appears in different locations on different trials. Recording from the lateral intraparietal area (LIP) revealed several neural features which varied with stimulus location. A second task made it possible to disentangle routing from other signals, by separating the time of routing from the onset of motion and decision making. In this second task, a visual cue indicated the location at which relevant motion would appear. After the cue was extinguished, two random dot motion patches appeared. An informative patch appeared at the cued location, and an uninformative patch appeared at another location. Comparison of these two tasks revealed three location dependent signals at motion onset: a visual signal related to surround suppression, a second suppressive signal that may set the amount of evidence required for decision making, and a 12-20 hertz oscillation in firing rate. This oscillation appears to be a signature of flexible information routing. It appears at motion onset when the motion stimulus varies in location unpredictably; it appears at cue onset when a spatial cue indicates the location information must be routed from; and it does not appear when stimulus location is fixed and flexible routing is not required. Future work on this project will eventually require tools which are not well developed for use in rhesus macaques. The final chapter describes two projects which attempt to address this problem, one through the use of optogenetics in monkeys and the other by adapting an established monkey behavioral task for use in mice.

No description available.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1990. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 107-128).

This study was designed to evaluate the possible existence of masked gonadotropin binding sites in the corpus luteum of the rhesus monkey. Pretreatment of macaque luteal particulates and cells with neuraminidase increased LH binding. In vitro exposure to alcohols also enhanced LH binding to these preparations. Ethanol modulation of LH binding was a time- and temperature-dependent process. The optimal concentration of ethanol for enhancing LH uptake was inversely proportional to the incubation temperature. Longer straight-chain alcohols were more potent than ethanol in increasing LH binding. Ethanol and neuraminidase increased the number of binding sites with no affect on affinity. Moreover, the effects of ethanol and NA were additive. Since alcohols and temperature are modulators of membrane fluidity, we examined the hypothesis that the unmasking of gonadotropin binding sites may be related to changes in the fluid state of the lipid bilayer of the luteal membrane. First, membrane fluidity was estimated from the fluorescence polarization of the membrane probe diphenylhexatriene. Conditions which resulted in enhanced gonadotropin binding (1-8% ethanol, increased temperature), increased the fluidity of luteal membranes. Moreover, changes in gonadotropin binding were highly correlated (r = -0.97) with changes in membrane fluidity under these conditions. Pretreatment of luteal particulates with neuraminidase had no apparent effect on membrane fluidity. Second, gonadotropin receptors were removed from the luteal membrane by detergent solubilization, and the effects of ethanol on soluble receptors were compared to those on receptors associated with the lipid bilayer. Solubilization resulted in the recovery of 50% more gonadotropin binding sites than are available in particulate preparations of the corpus luteum; these sites displayed lower affinity for gonadotropin. Moreover, conditions which increase LH binding to luteal particulates (1-8% ethanol at 25C) decreased LH uptake by soluble receptors. The data suggest that two populations of LH binding sites are masked within the membranes of the monkey corpus luteum. The ability of two markedly different agents, alcohol and neuraminidase, to increase LH binding indicates the diverse mechanisms may modulate the masking/unmasking of gonadotropin receptors in target cell membranes. As such, changes in membrane fluidity may play an important role in this response.