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Lexical effects on speech production...

Chiu, Yi-Fang.

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Lexical effects on speech production and intelligibility in Parkinson's disease.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Lexical effects on speech production and intelligibility in Parkinson's disease./
作者:	Chiu, Yi-Fang.
面頁冊數:	128 p.
附註:	Source: Dissertation Abstracts International, Volume: 76-03(E), Section: B.
Contained By:	Dissertation Abstracts International76-03B(E).
標題:	Speech therapy. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3643011
ISBN:	9781321302752

Lexical effects on speech production and intelligibility in Parkinson's disease.
Chiu, Yi-Fang.

Lexical effects on speech production and intelligibility in Parkinson's disease. - 128 p.

Source: Dissertation Abstracts International, Volume: 76-03(E), Section: B.

Thesis (Ph.D.)--Indiana University, 2014.

Individuals with Parkinson's disease (PD) often have speech deficits that lead to reduced speech intelligibility. Previous research provides a rich database regarding the articulatory deficits associated with PD including restricted vowel space (Skodda, Visser, & Schlegel, 2011) and flatter formant transitions (Tjaden & Wilding, 2004; Walsh & Smith, 2012). However, few studies consider the effect of higher level structural variables of word usage frequency and the number of similar sounding words (i.e. neighborhood density) on lower level articulation or on listeners' perception of dysarthric speech. The purpose of the study is to examine the interaction of lexical properties and speech articulation as measured acoustically in speakers with PD and healthy controls (HC) and the effect of lexical properties on the perception of their speech.

ISBN: 9781321302752Subjects--Topical Terms:

520446
Speech therapy.

Lexical effects on speech production and intelligibility in Parkinson's disease.
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245 1 0 $a Lexical effects on speech production and intelligibility in Parkinson's disease.
300 $a 128 p.
500 $a Source: Dissertation Abstracts International, Volume: 76-03(E), Section: B.
500 $a Adviser: Karen Forrest.
502 $a Thesis (Ph.D.)--Indiana University, 2014.
520 $a Individuals with Parkinson's disease (PD) often have speech deficits that lead to reduced speech intelligibility. Previous research provides a rich database regarding the articulatory deficits associated with PD including restricted vowel space (Skodda, Visser, & Schlegel, 2011) and flatter formant transitions (Tjaden & Wilding, 2004; Walsh & Smith, 2012). However, few studies consider the effect of higher level structural variables of word usage frequency and the number of similar sounding words (i.e. neighborhood density) on lower level articulation or on listeners' perception of dysarthric speech. The purpose of the study is to examine the interaction of lexical properties and speech articulation as measured acoustically in speakers with PD and healthy controls (HC) and the effect of lexical properties on the perception of their speech.
520 $a Individuals diagnosed with PD and age-matched healthy controls read sentences with words that varied in word frequency and neighborhood density. Acoustic analysis was performed to compare second formant transitions in diphthongs, an indicator of the dynamics of tongue movement during speech production, across different lexical characteristics. Young listeners transcribed the spoken sentences and the transcription accuracy was compared across lexical conditions.
520 $a The acoustic results indicate that both PD and HC speakers adjusted their articulation based on lexical properties but the PD group had significant reductions in second formant transitions compared to HC. Both groups of speakers increased second formant transitions for words with low frequency and low density, but the lexical effect is diphthong dependent. The change in second formant slope was limited in the PD group when the required formant movement for the diphthong is small. The data from listeners' perception of the speech by PD and HC show that listeners identified high frequency words with greater accuracy suggesting the use of lexical knowledge during the recognition process. The relationship between acoustic results and perceptual accuracy is limited in this study suggesting that listeners incorporate acoustic and non-acoustic information to maximize speech intelligibility.
590 $a School code: 0093.
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710 2 $a Indiana University. $b Speech and Hearing Sciences. $3 2097732
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793 $a English
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