Influences of Auditory and Somatosensory Feedback on Vowel Production

R Netsell, L Wallace, K Bakker


The purpose of this study was to examine the separate and combined influences of auditory and somatosensory feedback on vowel production.  Measurements of the first two formants spoken by adult male subjects were made at midvowel for the vowel /i/ in four conditions: 1) normal speaking condition, 2) bite block, 3) auditory masking, and 4) bite block and masking.  Significant differences were found in each of the experimental conditions.  Analyses supported the hypothesis that undershoot would occur in the masking condition and the bite block and masking condition.  Undershoot also occurred in the bite block only condition.  It was concluded that both auditory and somatosensory feedback are used in the afferent guided production of vowels in words.