Browsing by Subject "Phonological processing"
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Item False memories in adults who do and do not stutter(2012-05) Jackson, Ladaun Shereen; Byrd, Courtney T.; Hampton, ElizabethThe purpose of this study was to further explore previously observed differences in phonological processing between adults who do and do not stutter through a list recall task. Three types of lists of words were generated according to their associations with a lure word: phonological, semantic, and hybrid. For the experimental task, participants were instructed to listen to recordings of lists of 12 words, 4 of each type, and immediately recall them in any order. We looked at recall accuracy and rate of production of each list's associated lure word. For recall accuracy, phonological lists were lowest, hybrid lists were in the middle, and semantic lists were highest. For production of the critical lure, phonological lists were the lowest, semantic lists were in the middle, and hybrid lists were highest. The pattern was the same for recall accuracy and critical lure production for both talker groups; however, the adults who stutter had lower means for each condition in both cases. The results provide further evidence that there are systematic and significant differences in the phonological working memory efficiency of AWS and AWNS, which may contribute to fluency differences.Item Lexical representations in children who stutter: evidence using a gating paradigm(2010-05) Hudson, Sarah Ann; Sheng, Li, Ph. D.; Byrd, Courtney T.This thesis investigated lexical representations of children who stutter (CWS) and children who do not stutter (CWNS) using a duration-blocked gating task. This thesis tested the hypothesis that children who stutter have underspecified phonological representations for words, are less sensitive to incremental and segmental information for lexical items, and therefore require more acoustic-phonetic information to activate words in their lexicon. Pilot data collected from fourteen children (ages 5;6 to 10;1): 7 CWS and 7 CWNS matched on age were included in this thesis. Results showed that children in both talker groups required relatively equal amounts of acoustic-phonetic information to identify target words. A regression model revealed that age in months predicted performance on the gating task for CWNS, but that age in months did not predict performance on the gating task for CWS suggesting a difference in the developmental maturity of lexical representations in CWS. Possible conclusions from these pilot data are presented along with recommendations for future research.Item Phoneme monitoring and rhyme monitoring in school-age children who stutter(2012-05) Stafford, Brook Ana; Byrd, Courtney T.; Hampton, ElizabethThe present study investigated phonological encoding skills in children who stutter (CWS). Participants were 4 CWS (M=10;9years) and 4 children who do no stutter (CNS) (M=12;1 years) The groups were compared in phoneme monitoring and rhyme monitoring, with a tone monitoring task providing a neutral baseline for comparison. Both the phoneme monitoring and rhyme monitoring tasks were performed during silent picture naming. Results revealed that both groups were faster and more accurate when monitoring the rhyme than when monitoring the phoneme. Results further indicated that the children who stutter were significantly slower in both conditions. These findings suggest that there may be a later transition to incremental processing in both typically developing children and those who stutter and that children who stutter may be even less efficient than children who do not stutter. However, these results may have been compromised by a few key variables.Item Visual to auditory silent matching task in adults who do and do not stutter(2015-05) Novack, Julie Sarah; Byrd, Courtney T.; Hampton, ElizabethThe purpose of the present study was to investigate the role of phonological working memory in adults who do and do not stutter through a visual to auditory silent matching task. This task also explored the possible relationship between auditory processing and its ability to affect performance on the task. Participants were 13 adults who stutter (mean age = 28 years), matched in age, gender, handedness, and education level with 13 adults who do not stutter (mean age = 28 years). For the nonvocal visual to auditory task, participants silently read an initial target nonword and matched that target nonword to four subsequent auditory nonword choices. The participants completed this task for 4- syllable and 7- syllable nonwords (N = 8 per set). Results indicated that adults who stutter were significantly less accurate than adults who do not stutter at both syllable lengths. Our present findings support previous research that suggests less efficient phonological working memory in adults who stutter.