Neural Correlations of Processing Lexically and Grammatically Degraded Linguistic Stimuli in a Familiar Narrative Context

Persistent Link:
http://hdl.handle.net/10150/579001
Title:
Neural Correlations of Processing Lexically and Grammatically Degraded Linguistic Stimuli in a Familiar Narrative Context
Author:
Bautista, Alexa Grace
Issue Date:
2015
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Functional activation for language processing in left hemisphere language regions has been shown to be correlated with intelligibility of the speech signal, with more intelligible stimuli yielding greater activation. We created stimuli in which intelligibility was reduced in two distinct ways. First, we created lexically degraded stimuli in which lexical items were spectrally rotated. Second, we created grammatically degraded stimuli in which function words and morphemes were spectrally rotated and scrambled in order. We hypothesized that contrasting these conditions would reveal brain areas differentially involved in processing lexical or grammatical information when matched for intelligibility. We used functional MRI to investigate differences in the neural response to normal and degraded stimuli. Stimuli were presented such that normal segments alternated with degraded ones in the context of a familiar narrative. Our results showed no statistically significant differences in activation between lexically and grammatically degraded stimuli. Surprisingly, we also found only a small difference in the anterior middle temporal gyrus between either kind of degraded stimuli and normal stimuli. A possible explanation is that the context of a familiar narrative may increase attention and intelligibility, reducing degradation effects.
Type:
text; Electronic Thesis
Degree Name:
B.S.
Degree Level:
bachelors
Degree Program:
Honors College; Speech, Language, and Hearing Sciences
Degree Grantor:
University of Arizona
Advisor:
Wilson, Stephen M.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen
dc.titleNeural Correlations of Processing Lexically and Grammatically Degraded Linguistic Stimuli in a Familiar Narrative Contexten_US
dc.creatorBautista, Alexa Graceen
dc.contributor.authorBautista, Alexa Graceen
dc.date.issued2015en
dc.publisherThe University of Arizona.en
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en
dc.description.abstractFunctional activation for language processing in left hemisphere language regions has been shown to be correlated with intelligibility of the speech signal, with more intelligible stimuli yielding greater activation. We created stimuli in which intelligibility was reduced in two distinct ways. First, we created lexically degraded stimuli in which lexical items were spectrally rotated. Second, we created grammatically degraded stimuli in which function words and morphemes were spectrally rotated and scrambled in order. We hypothesized that contrasting these conditions would reveal brain areas differentially involved in processing lexical or grammatical information when matched for intelligibility. We used functional MRI to investigate differences in the neural response to normal and degraded stimuli. Stimuli were presented such that normal segments alternated with degraded ones in the context of a familiar narrative. Our results showed no statistically significant differences in activation between lexically and grammatically degraded stimuli. Surprisingly, we also found only a small difference in the anterior middle temporal gyrus between either kind of degraded stimuli and normal stimuli. A possible explanation is that the context of a familiar narrative may increase attention and intelligibility, reducing degradation effects.en
dc.typetexten
dc.typeElectronic Thesisen
thesis.degree.nameB.S.en
thesis.degree.levelbachelorsen
thesis.degree.disciplineHonors Collegeen
thesis.degree.disciplineSpeech, Language, and Hearing Sciencesen
thesis.degree.grantorUniversity of Arizonaen
dc.contributor.advisorWilson, Stephen M.en
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