The primary vocal registers of modal, falsetto, and fry have been studied in adults but not per
se in infancy. The vocal ligament is thought to play a critical role in the modal-falsetto
contrast but is still developing during infancy (Tateya and Tateya, 2015). 41 Cover tissues
are also implicated in the modal-fry contrast, but the low fundamental frequency (fo) cutoff of
70 Hz, shared between genders, suggests a psychoacoustic basis for the contrast. Buder,
Chorna, Oller, and Robinson (2008) 6 used the labels of “loft,”“modal,” and “pulse” for�…