Effects of ejective stops on preceding vowel duration

Area of Science:

• Linguistic Phonetics
• Experimental Phonetics
• Phonology

Background:

• Vowels are generally longer before voiced than voiceless obstruents.
• The precise phonetic causes for this vowel duration difference remain debated.
• Ejective stops, a third laryngeal feature, have not been studied in this context.

Purpose of the Study:

• To investigate vowel duration differences before voiced, ejective, and voiceless aspirated stops in Georgian.
• To simultaneously model the effects of stop closure duration and voice onset time (VOT) on preceding vowel duration.
• To test competing hypotheses explaining vowel duration variations.

Main Methods:

• Experimental measurement of vowel duration preceding stops in Georgian.
• Analysis of closure duration and voice onset time (VOT) for voiced, ejective, and voiceless aspirated stops.
• Statistical modeling to assess the independent effects of laryngeal features, closure, and VOT.

Main Results:

• Vowels exhibit significantly different durations before all three stop types (voiced, ejective, voiceless aspirated).
• These differences persist even after controlling for closure duration and VOT.
• Vowel duration is inversely correlated with both closure duration and VOT.

Conclusions:

• Laryngeal gestures, temporal compensation, and closure velocity are supported as factors influencing vowel duration.
• Perceptual and airflow expenditure explanations for vowel duration differences are weakened by the findings.
• The study provides crucial data on ejective stops and their impact on preceding vowel length.