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Department of Cognitive Science

Cognitive Science Alumni

Lynn Li Lim

Lynn Li Lim

Thesis Details

An investigation of the effects of multiple productions in the analysis of the speech productions of speakers with speech sound deficits

Acoustic speech research typically relies on the analysis of multiple repetitions of target words to overcome the inherent variability of speech production. However, it is not known whether eliciting multiple word repetitions from people with acquired speech sound production disorders may affect their speech production difficulties. It is hypothesised that multiple word repetition may bring about effects of fatigue, or act as practice, in such speakers. Fatigue may lead to deterioration in speech sound production, whereas practice may lead to speech improvements. Multiple word repetition may also have no effect on speech productions. If there are effects, eliciting multiple word repetitions in impaired-speech research may confound the investigation of the nature of the disorder. This study examines the acoustic properties of consonants and vowels in multiple repetitions of target words elicited from two speakers with acquired speech sound production disorders for indications of such effects. The acoustic parameters were voice onset time, fricative first spectral moment and vowel duration. No effects of fatigue or practice on the speech sound production of the two speech-impaired speakers were found. There were also no such effects for two control speakers. Hence, the method of eliciting multiple word repetitions in acoustic speech research may not affect the speech sound production of speakers with acquired speech disorders.

  • Type: Masters
  • Scholarship : Other
  • Supervisors : Professor Max Coltheart, Dr. Sallyanne Palethorpe (associate), Dr. Karen Croot (external)

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