How is period doubling perceived?

Questions asked and answered in the second study:

1) How do people perceive and produce period-doubled voicewith different modulation types and varying degrees of modulation?

2) How does period doubling affect linguistic tone perception and production?

3) Do speakers of tonal vs. non-tonal languages behave differently?

Part of the findings in this perception study was presented at ASA Nashville Meeting Fall 2022 in session 3aSC Speech Perception, Dec. 7, 2022.