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. / The purpose of this study was to determine the effects of varying levels of stimulation on the subsequent attentive behaviors and visual preferences of four months old. Based on experimental results of studies of exploratory behavior in animals and infants as well as studies of sensory deprivation, the following hypotheses were proposed: 1) Infants will attend more to visual stimuli following a period of low stimulation than following a period of high stimulation. 2) Infants will attend more to a novel stimulus than a familiar one following a period of high stimulation. Furthermore, the study aimed at determining whether the stimulus preferences which emerged following high stimulation were altered following a period of low stimulation. [TRUNCATED] / 2031-01-01

MMed, Paediatrics, Faculty of Health Sciences, University of the Witwatersrand, 2006

No description available.

AIMS: To assess (i) the safety of once daily dosing (ODD) of gentamicin by systematic evaluation of ototoxicity and nephrotoxicity; and (ii) the usefulness of therapeutic drug monitoring (TDM) in a paediatric cohort. METHOD: Infants and children with suspected or proven gram negative sepsis were enrolled prospectively to receive ODD gentamicin at 7 mg/kg/day. Neonates were excluded. Hearing and renal function were assessed at baseline, during and after therapy by otoacoustic emissions (OAE) and by either serum creatinine or glomerular filtration rate. Abnormal OAE were followed with audiometry. TDM was performed using an interval adjusted graphical method (Hartford nomogram) with levels taken between 6-14 hours after dose. Assessment of efficacy (clinical and microbiological) was a secondary outcome measure. RESULTS: There were 106 episodes of therapy in 79 children (median age 5.6 years; range 1 month - 16 years), 60% of which were for febrile neutropaenia. Evaluation was complete in 88% (93/106) for ototoxicity and 92% (98/106) for nephrotoxicity. Two children (1.88%, 95% CI 0.10 - 7.13) experienced permanent hearing loss. Three children did not complete full assessment after preliminary abnormalities on OAE. Incorporating these cases gives a ???worst case scenario??? incidence of 4.71% (95% CI 1.71 - 10.91) possible ototoxicity. One child (0.94%, 95% CI < 0.10 - 5.73) experienced transient nephrotoxicity. No ???toxic??? serum gentamicin levels were detected, including in those children who experienced clinical toxicity. All children with detectable toxicity were undergoing treatment for malignancies and had received nephro or ototoxic medications prior to the gentamicin course. Complete or partial efficacy was seen in 93% (non oncology) and 78% (oncology) treatment episodes, equivalent to prior literature reports. CONCLUSION: In this systematically evaluated paediatric cohort receiving ODD gentamicin, toxicity occurred infrequently and only in those with identifiable risk factors. TDM did not identify children who developed clinical toxicity. The development of toxicity appears to be associated with factors such as underlying medical condition, prior courses of gentamicin, exposure to other oto or nephrotoxic medications, all of which may be more predictive of toxicity than elevated serum gentamicin levels. TDM in healthy children on short course gentamicin appears unnecessary, but may be warranted in conjunction with renal and hearing assessments in those with risk factors.

Over recent decades, much has been learned about the perceptual capacity that enables infants to recognize and understand language. However, not until very recently have the neural mechanisms that are the substance of language learning been investigated. A recently developed optical imaging technique called near-infrared spectroscopy (NIRS) shows promise for being an acceptable alternative to invasive imaging techniques. NIRS measures correlates of neural activity by assessing hemoglobin concentration changes in the infant brain. The research presented here investigates neural activation in the left temporal and occipital cortex regions during exposure to speech and visual stimuli. As hypothesized, hemodynamic reaction was observed in both areas. Results indicate a significant activation in response to speech in the left temporal region, and an intriguing difference between uni- and bi-modally presented speech stimuli. These results have interesting implications for future multimodal studies of infant speech perception.

Thesis (Ph.D.)--University of Nebraska-Lincoln, 2009. / Title from title screen (site viewed February 25, 2010). PDF text: 80 p. : ill. ; 206 K. UMI publication number: AAT 3386551. Includes bibliographical references. Also available in microfilm and microfiche formats.

Thesis (Ph.D.)--University of Nebraska-Lincoln, 2009. / Title from title screen (site viewed February 25, 2010). PDF text: xi, 257 p. : ill. ; 4 Mb. UMI publication number: AAT 3386549. Includes bibliographical references. Also available in microfilm and microfiche formats.

Thesis--Bryn Mawr College. / Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.A.)--York University, 1999. Graduate Programme in Psychology. / Typescript. Includes bibliographical references (leaves 42-51). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://wwwlib.umi.com/cr/yorku/fullcit?pMQ56163.

Thesis (M. Med. Sc.)--University of Hong Kong, 2002. / Includes bibliographical references (leaves 74-83).