The Role of Nucleus Accumbens in Tinnitus

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dc.contributor.ORCID0000-0002-2536-9491 (Hullfish, JA)
dc.contributor.advisorVanneste, Sven
dc.contributor.advisorHart, John, Jr.
dc.creatorHullfish, Jeffrey A
dc.date.accessioned2019-09-26T23:57:20Z
dc.date.available2019-09-26T23:57:20Z
dc.date.created2019-05
dc.date.issued2019-05
dc.date.submittedMay 2019
dc.date.updated2019-09-26T23:59:31Z
dc.description.abstractIn the present study, we use resting state fMRI to investigate whether nucleus accumbens (NAc) and extended frontostriatal networks are involved in the pathology of auditory phantom perception, i.e. tinnitus, through a study of functional connectivity. We hypothesize that resting state functional connectivity involving NAc will be increased relative to what is observed in healthy subjects and that this connectivity will correlate with clinical measures of tinnitus such as percept loudness, duration of symptoms, etc. We show that a large sample of patients with chronic tinnitus (n = 90) features extensive functional connectivity involving NAc that is largely absent in healthy subjects (n = 94). We further show that connectivity involving NAc correlates significantly with tinnitus percept loudness and the duration of tinnitus symptoms, even after controlling for the effects of age and hearing loss. The loudness correlation, which involves NAc and parahippocampal cortex, is consistent with existing literature identifying the parahippocampus as a tinnitus generator. Our results further suggest that frontostriatal connectivity may predict the transition from acute to chronic tinnitus, analogous to what is seen in the pain literature. We discuss these ideas and suggest fruitful avenues for future research.
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/10735.1/6894
dc.language.isoen
dc.rights©2019 Jeffrey Andrew Hullfish
dc.subjectMagnetic resonance imaging
dc.subjectNucleus accumbens
dc.subjectChronic pain
dc.subjectTinnitus
dc.titleThe Role of Nucleus Accumbens in Tinnitus
dc.typeDissertation
dc.type.materialtext
thesis.degree.departmentCognition and Neuroscience
thesis.degree.grantorThe University of Texas at Dallas
thesis.degree.levelDoctoral
thesis.degree.namePHD

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