THE EFFECTS OF SPEAKING STYLE ON VOWEL SPACE AND LONG-TERM FORMANT DISTRIBUTIONS

This thesis analyzed the effects of speaking style, either read or spontaneous speech, on vowel spaces and long-term formant distributions (LTFD), alongside other sociolinguistic effects (sex and age). The results indicated that formant frequencies were indeed modulated by speaking style, with vowel spaces showing centralization during spontaneous speech compared to read speech. LTFD showed an increase in frequency during spontaneous speech over read speech, particularly in the third long-term formant (LTF3). Sex and age were both significant factors for both vowel space and LTFD, with males and older speakers producing lower frequencies. The examination of the effect of speech style, sex and age on vowel space and LTFD allows us to better understand the factors that play a role in speech production.