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PDFOpen Access (License Unspecified), Open Access
Thesis
Semantics of auditory neglect
Master of Science (M.S.), Drexel University
Jun 2017
DOI:
https://doi.org/10.17918/etd-7400
Abstract
Auditory neglect exists when a person who has a brain lesion does not perceive an auditory stimulus in one ear when stimuli are presented binaurally or dichotically. The first aim of the current study was to simulate auditory neglect in participants with normal auditory perception using an experimental model of auditory neglect. This study hypothesized that when semantically related words were presented dichotically the simulated auditory neglect would be attenuated but not with unrelated words. Forty-five participants with normal auditory perception listened to the words pairs in a dichotic listening task in which the left ear was masked with noise. The experimental task was able to simulate auditory neglect and semantically related words were reported more than unrelated words. A second experiment was conducted to determine brain areas mediating the semantic system using functional Magnetic Resonance Imaging (fMRI). It was hypothesized that brain activation would be lateralized to the left hemisphere during auditory processing of semantic stimuli and there would be a difference in activation for semantically related words compared to non-semantically related words. Seventeen healthy, neurologically normal participants underwent fMRI scanning during which they listened semantic and non-semantic word pairs presented dichotically and judged if the words were related in meaning. Activation was lateralized to the left for the task. Both semantic and non-semantic conditions showed activation throughout the left frontal and temporal lobes. Direct comparison of the semantic and the non-semantic conditions did not yield different localization patterns.
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Details
- Title
- Semantics of auditory neglect
- Creators
- Neggin Keshavarzian - DU
- Contributors
- J. Michael Williams (Advisor) - Drexel University, Psychological and Brain Sciences (Psychology)
- Awarding Institution
- Drexel University
- Degree Awarded
- Master of Science (M.S.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- viii, 38 pages
- Resource Type
- Thesis
- Language
- English
- Academic Unit
- Psychological and Brain Sciences (Psychology); College of Arts and Sciences; Drexel University
- Other Identifier
- 7400; 991014632549804721