PHONETOTOPIC ORGANIZATION OF PHONATION EVIDENCE FROM ELECTROPHYSIOLOGY, AERODYNAMICS, ACOUSTICS AND...
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Transcript of PHONETOTOPIC ORGANIZATION OF PHONATION EVIDENCE FROM ELECTROPHYSIOLOGY, AERODYNAMICS, ACOUSTICS AND...
PHONETOTOPIC ORGANIZATION OF PHONATION
EVIDENCE FROM ELECTROPHYSIOLOGY, AERODYNAMICS, ACOUSTICS AND
KINESTETICS
Krzysztof Izdebski Pacific Voice and Speech Foundation
San Francisco, CA, USA
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.
Method: Data from electromyographic, aerodynamic, kinesthetic and
acoustic signals acquired simultaneously during the
production of phonatory ranges, intensities and reaction times.
Hooked-wire bipolar electrodes were inserted bilaterally to
TA, IA, LCA, CT, ST, THmuscles with simultaneous
recordings of Ps, Af, Pio and voice
Tasks included full glissando and varied intensity ranges, speech containing selected segments
comprising loaded, voiceless and random segments
Phonation was initiated at various lung volumes
(MCE, Full and Residual LV)
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…)
RTs were elicited in 1: subject own condition
2: on air flow 3: on breath holding
Auditory, Visual and Somesthetic Stimuli were used at randomized
pre-stimulus intervals between 200 and 3000 msec
Experimental cohort varied from
1 to 15 subjects depending on tasks
complexity and medical conditions
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 dB
Both untrained and trained subjects
participated
Results
From these data a model of phonatory organization was
constructed, termed “Phonetotopic model of
phonation.”
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.
Vertical Larynx Position (VLP)
RT = 130 msec60 msec cortical time30 msec efferent time
40-50 msec muscle contration time
XVI PVC PVSF/UCLA
QuickTime™ and a decompressor
are needed to see this picture.
Tremor vs ADDSD
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.
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.
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.
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
This research was conducted with
Dr. Thomas Shipp
and this Model is dedicated to him
The End