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Phonetotopic Organization of Phonation: Evidence from Electrophysiology, Aerodynamics, Acoustics, and Kinesthetics

This research presents a neurophysiologic model of phonation organization and proposes voice pitch pattern predictability. Evidence on understanding phonation training and disordered phonation processes is provided, using data from electrophysiology, aerodynamics, acoustics, and kinesthetics. The results suggest that deviations in voice patterns can indicate specific voice conditions present in vocal pathologies or during artistic training. The Phonotopic model of phonation allows for a comprehensive description of phonation, highlighting any pitfalls or deficits in production.

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Phonetotopic Organization of Phonation: Evidence from Electrophysiology, Aerodynamics, Acoustics, and Kinesthetics

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  1. PHONETOTOPIC ORGANIZATION OF PHONATION EVIDENCE FROM ELECTROPHYSIOLOGY, AERODYNAMICS, ACOUSTICS AND KINESTETICS Krzysztof Izdebski Pacific Voice and Speech Foundation San Francisco, CA, USA

  2. 1: Presentation of a neurophysiologic model of phonation organization 2: Propose voice pitch pattern predictability 3: Provide evidence for understanding of phonation training and disordered phonation processes.

  3. Method: Data from electromyographic, aerodynamic, kinesthetic and acoustic signals acquired simultaneously during the production of phonatory ranges, intensities and reaction times.

  4. Hooked-wire bipolar electrodes were inserted bilaterally toTA, IA, LCA, CT, ST, THmuscles with simultaneousrecordings of Ps, Af, Pio and voice

  5. Tasks included full glissando and varied intensity ranges, speech containing selected segments comprising loaded, voiceless and random segmentsPhonation was initiated at various lung volumes (MCE, Full and Residual LV)

  6. Tasks included phonatory RTsarranged in the matter of complexity to reflectcortial organization and peripheral componentsi.e. vowel, syllables, words with progressive complexity, (v, vic, vicar, vicerage…)

  7. RTs were elicited in 1: subject own condition 2: on air flow 3: on breath holdingAuditory, Visual and Somesthetic Stimuli were used at randomized pre-stimulus intervals between 200 and 3000 msec

  8. Experimental cohort varied from 1 to 15 subjects depending on taskscomplexity and medical conditions

  9. Vertical Larynx Positionmotion were tracked with lateral filming and profile motion was digitized for up and down deviations from rest as a function of Fo and dBBoth untrained and trained subjectsparticipated

  10. Results

  11. From these data a model of phonatory organization was constructed, termed “Phonetotopic model of phonation.”

  12. Results: It was found that human voice pitch production follows a predictable pattern. This pattern follows phonetotopic organization of all intrinsic and extrinsic laryngeal muscle activity corresponding to given pitch, intensity and quality targets.

  13. Vertical Larynx Position (VLP)

  14. RT = 130 msec60 msec cortical time30 msec efferent time40-50 msec muscle contration time

  15. XVI PVC PVSF/UCLA

  16. Tremor vs ADDSD

  17. Conclusions:Based on this phonetotopic organization, voice pattern deviations are predictable and consequently indicative of voice conditions present in the various vocal pathologies and/or during artistic training.

  18. Therefore, when examining voice production by referring observations to phonetotopic patterns, an unequivocal description of any phonation is possible. Accordingly, pitfalls or deficits of phonation production will correspond in an organized fashion to the specific conditions observed.

  19. Depending upon these conditions, phonation patterns will differ with organic (mucosal), neurologic (motility), traumatic (motility and mobility) and/or functional dysphonias including malingering, or when the subject is undergoing vocal training.

  20. References: Izdebski, K. Clinical Voice Assessment: The Role & Value of the Phonatory Function Studies. Chapter 29, In Lalwani, A. K. (ed.) Current Diagnosis & Treatment in OTOLARYNGOLOGY-HEAD & NECK SURGERY, Lange Medical Books/McGraw- Hill, New York, 3rd Edition, 2011

  21. This research was conducted with Dr. Thomas Shippand this Model is dedicated to him

  22. The End

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