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181 results on '"Greene, Nathaniel T."'

5. Hearing ability of prairie voles (Microtus ochrogaster)

Author

New, Emily M., primary, Hurd, Jessica A., additional, Alarcon, Genesis A., additional, Miller, Cameron S., additional, Williams, Peyton A., additional, Greene, Nathaniel T., additional, Sergott, Casey E., additional, Li, Ben-Zheng, additional, Lei, Tim C., additional, and McCullagh, Elizabeth A., additional

Published
2024
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10. Can you hear me now? Binaural brainstem and spatial hearing deficits in a Guinea pig model of noise-induced cochlear synaptopathy.

Author

Benson, Monica A., Peacock, John, Greene, Nathaniel T., and Tollin, Daniel J.

Subjects
HIDDEN hearing loss, GUINEA pigs, EAR, INNER ear, BRAIN stem
Abstract

Noise-induced cochlear synaptopathy has been studied for over 20 years with no known diagnosis for this disorder within the human population. This type of "hidden hearing loss" induces a loss of synapses in the inner ear but no change in audiometric thresholds. Animal studies to this point have focused primarily on peripheral hearing measures to diagnose ribbon synapse loss. Here, we measure binaural hearing deficits in a model of noise-induced cochlear synaptopathy for the first time. Our results show that while common audiological assessments show no change in threshold post moderate noise exposure, measurable binaural hearing deficits persist long-term. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Loneliness and Perceived Social Support in the Workplace of the School Principal

Author

Greene, Nathaniel T.

Abstract

In their role as organizational leader, school principals may confront issues of professional isolation that can lead to feelings of loneliness. The purpose of this study was to determine if principals' perceptions of social support were predictive of levels of loneliness. Using a survey instrument, data were collected to determine participants' perception of social support and level of loneliness. Data analysis determined that perceived social support acted as a moderate, negative predictor of loneliness. Further analysis identified perceived support from teachers as being a stronger predictor than perceived support from either superintendents or other principals. The discussion concludes with the possibility for greater appraisal support for principals in the form of constructive performance feedback. Recommendations for further research are given. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]

Published
2016

20. Auditory brainstem development of naked mole-rats ( Heterocephalus glaber )

Author

McCullagh, Elizabeth A., primary, Peacock, John, additional, Lucas, Alexandra, additional, Poleg, Shani, additional, Greene, Nathaniel T., additional, Gaut, Addison, additional, Lagestee, Samantha, additional, Zhang, Yalan, additional, Kaczmarek, Leonard K., additional, Park, Thomas J., additional, Tollin, Daniel J., additional, and Klug, Achim, additional

Published
2022
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25. Effects of Varying Laser Parameters During Laser Stapedotomy on Intracochlear Pressures.

Author

Boscoe, Elizabeth F., Banakis Hartl, Renee M., Gubbels, Samuel P., and Greene, Nathaniel T.

Abstract

Objective: Sensorineural hearing loss is a known complication of stapes surgery. We previously showed that laser stapedotomy can result in intracochlear pressures that are comparable to high sound pressure levels. Optimizing laser settings to those that correspond with the lowest pressure changes may mitigate risk for postoperative hearing loss. Here we quantify the effects of various laser parameters on intracochlear pressures and test the hypothesis that intracochlear pressure changes are proportional to the laser energy delivered. Study Design: Basic and translational science. Setting: Cadaveric dissection and basic science laboratory. Methods: Cadaveric human heads underwent mastoidectomies. Intracochlear pressures were measured via fiber‐optic pressure probes placed in scala vestibuli and tympani. Pulses of varied stimulus power and duration from a 980‐nm diode laser were applied to the stapes footplate. Results: Sustained high‐intensity pressures were observed in the cochlea during all laser applications. Observed pressure magnitudes increased monotonically with laser energy and rose linearly for lower stimulus durations and powers, but there was increased variability for laser applications of longer duration (200‐300 ms) and/or higher power (8 W). Conclusions: Results confirm that significant pressure changes occur during laser stapedotomy, which we hypothesize may cause injury. Overall energy delivered depends predictably on duration and power, but surgeons should use caution at the highest stimulus levels and longest pulse durations due to the increasing variability in intracochlear pressure under these stimulus conditions. While the risk to hearing from increased intracochlear pressures from laser stapedotomy remains unclear, these results affirm the need to optimize laser settings to avoid unintended injury. [ABSTRACT FROM AUTHOR]

Published
2023
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