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Il est facile d’apercevoir un champignon. Mais lequel ?Il y faut toujours une sorte de révélation. Une vision doittraverser les paroles et les imageries et nous transporterdans un monde irrésistible où s’affirme enfin dans sonincroyable vérité le champignon vivant. Enfin n’oubliezpas qu’ils ne poussent jamais sans un saisissement.André Dhôtel, La Rhétorique fabuleuse « Comment n’y avons-nous pas pensé plus tôt », fut la conclusion de notre éditeur quand nous lui proposâmes notre livre. Un cor..

Acoustic coupling in phonation and its effect on inverse filtering of oral airflow and neck surface acceleration

Many aspects of the coupling between vocal fold motion, glottal airflow, and resulting sound waves remain unexplored, particularly during incomplete glottal closure. In addition, this coupling has been associated with distortions in the estimates of glottal parameters obtained from neck acceleration measurements, thus affecting the ambulatory assessment of vocal function. This acoustic coupling and its effects on inverse filtering of oral airflow and neck surface acceleration during vowel production were investigated using numerical and experimental methods. A lumped element self-oscillating model was extended to include different types of incomplete glottal closure, which provided an enhanced simulation tool that mimicked normal and hyperfunctional voices. Novel in vivo measurements and analyses of vocal fold tissue instabilities due to acoustic coupling were obtained using synchronous laryngeal high-speed videoendoscopy recordings. These observations suggested that instabilities differed at the vocal fold tissue level from those where no strong coupling was present, but classified each as subcritical Hopf bifurcations. These findings supported the concept of describing interactions within the voice production system based on acoustic impedance representations. In addition, an impedance-based inverse filtering approach with time-varying glottal coupling demonstrated how source-tract interactions skewed and altered the glottal pulses. Based on these observations, a subglottal inverse filtering scheme for neck surface acceleration was proposed and evaluated, yielding estimates of glottal aerodynamic parameters with accuracy comparable to that of standard pneumotachograph measurements and closed-phase inverse filtering

Fostering Collaborations and Partnerships Through OSEP Grants

Presenters from three universities discussed how Office of Special Education Programs (OSEP) grant projects have fostered interdisciplinary collaborations and school/community partnerships. This session discussed the powerful lessons that have emerged from those collaborations, which have involved related services personnel in schools (e.g., school psychology, school counseling, special education, speech and language pathology, and school social work), as well as community partners (e.g., transportation specialists, urban designers, and geographers)