School of Languages and Linguistics - Research Publications

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Start date: 2010 × End date: 2010 × Type: Conference Paper × Author: Fletcher, Janet ×

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    Acoustic analysis of the effects of 24 hours of sustained wakefulness
    Vogel, AP ; Fletcher, J ; Maruff, P (Australasian Speech Science and Technology Association, 2010)
    The effect of 24 hours of sustained wakefulness on the speech of healthy adults is poorly documented. Therefore, speech samples were systematically acquired (e.g., every four hours) from 18 healthy adults over 24 hours. Stimuli included automated and extemporaneous tasks, sustained vowel and a read passage. Measures of timing and frequency were derived acoustically using Praat and significant changes were observed on all tasks. The effect of fatigue on speech was found to be strongest just before dawn (after 22 hours). Key features of timing (e.g., mean pause length), frequency (e.g., F4 variation) and power (alpha ratio) changed as a function of increasing levels of fatigue. Index Terms: fatigue, voice, tiredness, clinical marker
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    (Mis)perceiving /el/ ~ /æl/ in Melbourne English: a micro-analysis of sound perception and change
    Loakes, DEL ; Hajek, JTH ; Fletcher, JF (Australasian Speech Science and Technology Australia (ASSTA), 2010)
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    Interpreting rising intonation in Australian English
    Fletcher, J ; Loakes, D (University of Illinois Press, 2010-01-01)
    Australian English is referred to widely as a rising variety of English due to the prevalence of rising tunes in interactive discourse. Australian English subjects were required to listen to a series of rising stimuli that varied in terms of pitch level and pitch span and were asked whether they heard a question or statement. The results showed that both rise span and pitch level of the rise elbow influenced the pattern of responses. If both were relatively high, subjects were most likely to interpret the rise as a question, with fewer question responses when the rise elbow was relatively low and the pitch span narrow. The results provide limited evidence for two simple rises in Australian English, but also confirm a high level of phonetic gradience amongst rising tunes in this variety.