Listener Strategies in the Perception of Dysarthric Speech: A thesis submitted in partial fulfilment of the requirements for the Degree of Master of Speech Language Therapy, Department of Communication Disorders, University of Canterbury (2011)
Type of ContentTheses / Dissertations
Thesis DisciplineSpeech and Language Therapy
Degree NameMaster of Speech and Language Therapy
PublisherUniversity of Canterbury. Communication Disorders
When listeners are presented with stimuli from multiple speakers versus single speakers in a perception experiment, decreased speech recognition accuracy and increased response time results. These findings have been demonstrated in studies that have employed normal (Creelman, 1957; Mullennix & Pisoni, 1990; Nygaard & Pisoni, 1998) and accented speech (Bradlow & Bent, 2008). It is thought that perceptual normalisation processes are, in part, responsible for this perceptual cost (Bladon, Henton, & Pickering, 1984; Johnson, 2009; Magnuson & Nusbaum, 2007; Mullennix, Pisoni, & Martin, 1989). Interestingly, studies are yet to examine whether these same findings occur when listeners encounter dysarthric speech – a naturally degraded speech signal associated with neurological disorder or disease. It has also been found that when listeners are exposed to multiple speakers with dysarthria, they generally adapt to the dysarthric signal over time; resulting in an improved ability to decipher the signal (Liss, Spitzer, Caviness, & Adler, 2002; Tjaden & Liss, 1995a). However, the rate of this adaption when listeners are exposed to a single speaker is yet to be examined. This study aimed to determine: (1) whether the intelligibility of dysarthric speech (in this case, hypokinetic dysarthria associated with Parkinson‘s disease) varied across single versus multi-speaker conditions; and (2) whether intelligibility increased over time when a listener was exposed to a single speaker with dysarthria. To answer these questions, sixty young healthy listeners were randomly allocated to one of four experimental conditions, one multiple speaker and three single speaker conditions. Each listener transcribed 60 three to five word phrases over one session and the results were examined for percent words correct. Contrary to expectations, there was no significant difference in percent intelligibility scores of the listener group who transcribed in a multi-speaker versus transcriptions from the single speaker listener conditions. In addition, perceptual learning effects across the rating period were identified for two out of the three single speaker listener groups only. The absence of significant findings in the multi-speaker versus single speaker transcripts may be explained by further analysis of within speaker variability. Acoustic analysis of the speakers may also shed light on the reduced perceptual learning that occurred in one of the single speaker groups. Greater numbers of speakers and experimental phrases would be beneficial in expanding trends seen in intelligibility of the single speaker groups.
KeywordsSpeech perception; Dysarthria
RightsCopyright Sharon Broadmore
Showing items related by title, author, creator and subject.
Integration of social and emotional information processing within an interview format for young children: age effects and associations with regulation and behaviour : a thesis submitted in partial fulfillment of the requirements for the Degree of Master of Arts in Child and Family Psychology in the University of Canterbury by Rebecca Ann Dowling Dowling, Rebecca Ann (University of Canterbury. Health Sciences, 2014)The role of emotion within the reformulated Social Information Processing (SIP) Model of Children’s Social Adjustment (Crick and Dodge, 1994) has not been well investigated, particularly for young children. A developmental ...
Treaty over the teacups : an exploration of teacher educators’ understandings and application of the provisions of the Treaty of Waitangi at the University of Canterbury, College of Education.A thesis submitted in partial fulfilment of the requirements for the Degreeof Master of Education in the University of Canterbury Stark, Robyn Ann (University of Canterbury. School of Teacher Education, 2015)Teacher educators at the University of Canterbury, College of Education, like all teacher educators in Aotearoa New Zealand, have ethical, legal, and moral obligations in relation to Te Tiriti o Waitangi/the Treaty of ...
Assisted Reproductive Technology: The Aotearoa/New Zealand Policy Context: A thesis submitted in fulfilment of the requirements for the degree of Master of Arts in Sociology in the University of Canterbury Batty, Lynne Patricia (University of Canterbury. Sociology, 2002)The focus of this thesis is the current policy situation in relation to assisted reproductive technologies (ART) in Aotearoa/New Zealand. I explore how government policies (and lack of policy) have shaped access to ART. I ...