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Biomedical subjects

Kathryn Murphy

Publications and source records attributed to Kathryn Murphy.

6 recordsLinked to original sources
PubMed2006

Short periods of concordant binocular vision prevent the development of deprivation amblyopia.

Based in part on deprivation studies, it is generally agreed that the development of vision and of the central visual pathways of higher mammals such as cats and primates is experience-dependent. Past deprivation experiments employed periods of exclusively abnormal early visual input. Because of the absence of any normal visual input, such studies indicate only the extremes to which the visual system can change in response to visually driven activity (i.e. its capabilities) rather than provide insight into the role of early visual input in normal development (i.e. what it actually does). We examined the possibility that certain visual input, i.e. normal concordant binocular vision, may be more efficacious than others with respect to its effects on the developing visual system and on vision. On a daily basis, one type of visual input, i.e. normal binocular experience (BE), was pitted against abnormal (monocular exposure, ME) input in order to see if one was more effective. We show that 2 h of daily normal concordant, but not discordant, BE outweighs or protects against as much as 5 h of daily abnormal input to permit the development of normal grating acuity and alignment accuracy in the two eyes. Further, we show that splitting the period of BE into two 1-h periods straddling the period of ME was ineffective, thereby indicating the 2 h of BE each day must be continuous to protect against the development of amblyopia.

Adaptation, Physiological↗
PubMed2005

Parents' perceptions of factors that affect successful diabetes management for their children.

OBJECTIVE: To learn which factors parents perceive to be most influential in determining successful type 1 diabetes management. METHODS: A 4-stage mixed qualitative-quantitative method that consists of a series of focus groups, a survey, and in-depth interviews was used to ensure that parents generated, prioritized, and explained their own ideas. In each stage, parents offered a new level of insight into their perception of how children achieve good metabolic control while living as normal a life as possible. The survey responses were divided into statistically different ranks, and the Kruskal-Wallis test was used to compare the results between subgroups. RESULTS: A total of 149 parents participated in the formative qualitative phases, 799 families (66%) responded to the parent-generated survey, and 67 explanatory interviews were conducted. The families who responded to the survey had children of varied ages (mean: 11.9 years; SD: 4.44) and diabetes control (mean hemoglobin A1c: 8.22%; SD: 1.65); 84.1% of respondents were white, 12.3% were black, and 89% were privately insured. The 30 survey items were statistically discriminated into 8 ranks. The items cover a wide range of categories, including concrete ways of achieving better control, families' or children's traits that affect coping ability, actions of the health care team that support versus undermine families' efforts, and the availability of community supports. No clear pattern emerged regarding 1 category that parents perceived to matter most. CONCLUSIONS: Clinicians can affect many of the factors that parents perceive to make a difference in whether they can successfully raise a resilient child in good diabetes control. Future research needs to determine whether health care teams that address the concerns that parents raised in this study are more effective in guiding children to cope well with diabetes, to incorporate healthier lifestyles, and ultimately to achieve better metabolic control.

Adaptation, Psychological↗
PubMed2003

Brief daily periods of binocular vision prevent deprivation-induced acuity loss.

The role of experience in the development of the central visual pathways has been explored in the past through examination of the consequences of imposed periods of continuously abnormal or biased visual input. The massive changes in the visual cortex (area 17) induced by selected early visual experience, especially monocular deprivation (MD) or experience (ME) where patterned visual input is provided to just one eye, are accompanied by profound and long-standing visual deficits. Although the use of exclusively abnormal experience permits identification of those aspects of the visual cortex and of visual function that can be influenced by visual experience during development, this approach may provide a distorted view of the nature of the role of visual experience because of the absence of any normal visual input. In this study a different approach was used whereby animals were provided daily with separate periods of normal (i.e., binocular exposure) and abnormal (monocular exposure) visual experience. We show that 2 hr of daily normal concordant binocular experience (BE) can outweigh or protect against much longer periods of monocular deprivation (MD) and permit the development of normal visual acuities in the two eyes. This result is not what would be expected if all visual input had equal influence on visual development.

Animals↗