Lingual protrusion and elevation in lingual dystonia: A hypothesis
Keywords:
Acoustic arrays, Computer programming, Computer software, Error analysis, Frequency response, Spectroscopic analysis, Speech analysis, Lingual protrusion, Lingual-fractive spectra, Phonetic errors, Time frequency response (TFR)Abstract
The speech deficits associated with lingual dystonia were analyzed using acoustic analyses. Acoustic analysis focusing on lingual-fractive spectra was conducted using spectrographic displays by the time frequency response (TFR) software program to investigate the hypothesis of abnormal lingual fronting and elevation. A prominent phonetic error was the misperception of the palatial fricative for the alveolar fricative. It was found that a common feature of lingual dystonic contractions involve lingual fronting and lingual elevation during speech production.
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