Glottal configuration during whispered /s/ and /z/ was determined using the ultrasonic pulse-echo method. Glottal configuration is different for whispered /s/ and /z/, with greater glottal constriction during whispered /z/.
Hamlet SL. Vocal Fold Articulatory Activity During Whispered Sibilants. Arch Otolaryngol. 1972;95(3):211–213. doi:10.1001/archotol.1972.00770080353005
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