Millions engage in learning a Second Language (L2) using their mobile devices with a wide range of success. Concomitantly, there exists a growing interest in research on the effects of mobile-assisted language learning and predictors of learner outcomes (e.g., Loewen et al., 2020; Sudina & Plonsky, 2023). However, few of these apps and studies…

This paper lays out techniques for investing different types of phonation from acoustic data. Nearly all the world's languages distinguish between voiced and voiceless phonation. Many languages use other phonation types, such as the breathy voice--also described as speaking while sighing. Another kind of voice quality, one frequently found in…