title: Laryngeal kinematics in voiceless obstruents produced by hearing-impaired speakers.
abstract: During normal production of voiceless consonants several events occur simultaneously in the vocal tract. These events must be temporally coordinated. Earlier work has indicated that a breakdown in interarticulator timing can contribute to the characteristic voiced-voiceless errors produced by hearing-impaired speakers. The present study examines kinematic details of the laryngeal articulatory gesture in 2 deaf speakers and a control subject using transillumination of the larynx. Results indicate that hearing-impaired speakers often do not produce differences between stops and fricatives in the kinematic details of the gesture. That is to say, although hearing speakers commonly use a larger laryngeal gesture for fricatives than for stops and also show durational differences of the abduction and the adduction phases between phonetic categories, the hearing-impaired subjects did not make them. Also, the deaf speakers participating in this study were more variable in the kinematic measures.
authors.affiliation: Haskins Laboratories, New Haven, CT.
authors.forename: N S
authors.initials: NS
authors.lastname: McGarr
authors.forename: A
authors.initials: A
authors.lastname: Löfqvist
mesh_terms: D001696:Biomechanical Phenomena; D003638:Deafness / Q000503:physiopathology*; D005931:Glottis / Q000502:physiology; D006801:Humans; D007830:Larynx / Q000502:physiology*; D009068:Movement; D010700:Phonetics; D013997:Time Factors