Hearing & Speech Sciences Theses and Dissertations
Permanent URI for this collectionhttp://hdl.handle.net/1903/2776
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Item Fluency and Speech Rate in Children with Localization-Related Epilepsy: Correlations with fMRI Profiles(2010) Steinberg, Mara E.; Bernstein Ratner, Nan; Hearing and Speech Sciences; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)Fluency and speech rate were examined in children with epilepsy, a group known to demonstrate depressed language skills. We also sought possible functional markers of increased disfluency during speech production tasks regardless of group. Children with epilepsy had significantly more disfluencies in their narratives than their typically-developing peers, while speech rate did not differ between groups. fMRI activation in working memory regions during a covert language processing task was significantly correlated with increased disfluency in another task involving narrative speech production. Additionally, there was a significant positive correlation between disfluency frequency and laterality of activation in the cerebellum. These results support the hypothesis that children with weaker language skills demonstrate increased levels of disfluencies in their narrative speech. Findings also suggest that children with higher rates of conversational speech disfluency may activate additional language and working memory regions when processing language, possibly reflecting the need for more mid-utterance incremental processing.Item Nasometric Assessment of Bilingual Spanish/English Speakers(2008) Doetzer, Ruthanne; Tian, Wei; Hearing and Speech Sciences; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)The purpose of this study was to examine the effect of native language on speech tasks requiring velopharyngeal closure, particularly the standardized Nasometric assessment of voice resonance. Comparison of ten native-English-speaking adults (N) and ten bilingual Spanish/English speakers (B) indicates that native language did not significantly influence standardized assessment scores, although the effect of gender remains ambiguous, with female participants generally producing higher nasalance scores. Within-subject comparison of the bilingual speakers' individual scores on the English and Spanish stimuli indicated significant differences in the scores obtained on the nasal sentence sets and the oro-nasal paragraphs. Highly fluent bilingual English/Spanish speakers, like the participants of this study, can be accurately assessed using the standardized English nasometry passages. Nevertheless, future researchers and diagnosticians investigating velopharyngeal movement and voice resonance should be aware of the possible gender effect and its potential interaction with native language.Item The effects of phonological neighborhoods on spoken word recognition in Mandarin Chinese(2007-08-27) Tsai, Pei-Tzu; Bernstein Ratner, Nan; Hearing and Speech Sciences; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)Spoken word recognition is influenced by words similar to the target word with one phoneme difference (neighbors). In English, words with many neighbors (high neighborhood density) are processed more slowly or less accurately than words with few neighbors. However, little is known about the effects in Mandarin Chinese. The present study examined the effects of neighborhood density and the definition of neighbors in Mandarin Chinese, using an auditory naming task with word sets differing in density levels (high vs. low) and neighbor types (words with neighbors with a nasal final consonant vs. words without such nasal-final neighbors). Results showed an inhibitory effect of high neighborhood density on reaction times and a difference between nasal-final neighbors and vowel-final neighbors. The findings suggest that neighbors compete and inhibit word access in Mandarin Chinese. Yet, other factors at the sublexical level may also play a role in the process.Item Early Understanding of Negation: The Word "Not"(2006-06-05) Loder, Lisa Sue; Newman, Rochelle; Hearing and Speech Sciences; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)Few experimental studies provide data on early comprehension of negation. Commonly accepted norms are based on parental report and observational studies using a small number of participants. The purpose of this study was to determine if 18-month-olds (n=24) understand the word not. The study used a preferential looking paradigm, in which children saw two video screens showing a puppet performing a different action in each video. They then heard a voice, telling them to "Look! The ____'s not ____ing." For the three sets of videos used in the study, children only looked significantly longer at the matching video during one set of trials. However, for no set of trials did the children look longer at the puppet overtly named in the auditory stimulus. These results suggests that although children did not demonstrate a clear understanding of the word not, they may be developing an understanding of not at this age.