Research Topics
| Ingo TitzeSummaryAffiliation: University of Iowa Country: USA Publications
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Detail Information
Publications
Source and filter adjustments affecting the perception of the vocal qualities twang and yawnIngo R Titze
Department of Speech Pathology and Audiology, National Center for Voice and Speech, The University of Iowa, Iowa City 52242, USA
Logoped Phoniatr Vocol 28:147-55. 2003..Listeners demonstrated variable perceptions in both continua with poor inter-subject, intra-subject, and inter-group reliability...- Methodology for rheological testing of engineered biomaterials at low audio frequenciesIngo R Titze
Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, Iowa 52242-1012, USA
J Acoust Soc Am 115:392-401. 2004..This can produce large errors in the viscous modulus near and above the resonance frequency. With appropriate inertia and phase corrections, +/- 10% accuracy can be obtained up to twice the resonance frequency... - Can vocal economy in phonation be increased with an artificially lengthened vocal tract? A computer modeling studyIngo R Titze
Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, IA, USA
Logoped Phoniatr Vocol 32:147-56. 2007.... 
Modeling source-filter interaction in belting and high-pitched operatic male singingIngo R Titze
National Center for Voice and Speech, The Denver Center for the Performing Arts, Denver, CO 80204, USA
J Acoust Soc Am 126:1530. 2009..Examples of lip openings from four well-known artists are used to infer vocal tract area functions and the corresponding reactances...- Acoustic interpretation of resonant voiceI R Titze
Department of Speech Pathology and Audiology, National Center for Voice and Speech, The University of Iowa, Iowa City 52242 1012, USA
J Voice 15:519-28. 2001..The fact that the sensations are felt in the face is an indication of effective conversion of aerodynamic energy to acoustic energy, rather than sound resonation in the sinuses or the nasal airways... - Laryngeal muscle activity in giggle: a damped oscillation modelIngo R Titze
Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, IA 52242 1012, USA
J Voice 22:644-8. 2008..It is reasoned that reduced lung pressure and lung volume limit the number of bursts and their duty ratio, while speed of intrinsic laryngeal muscle contraction dictates the burst frequency... - Normal vibration frequencies of the vocal ligamentIngo R Titze
Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, Iowa 52242, USA
J Acoust Soc Am 115:2264-9. 2004..A formula is given for correcting the ideal string equation for the lowest mode frequency to include bending stiffness and macula flavae effects... - Vocal dose measures: quantifying accumulated vibration exposure in vocal fold tissuesIngo R Titze
University of Iowa, Iowa City, USA
J Speech Lang Hear Res 46:919-32. 2003.... - Nonlinear source-filter coupling in phonation: theoryIngo R Titze
Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, Iowa 52242, USA
J Acoust Soc Am 123:2733-49. 2008..In addition, the linear theory does not predict bifurcations in the dynamical behavior of vocal fold vibration due to acoustic loading by the vocal tract... - Rules for controlling low-dimensional vocal fold models with muscle activationIngo R Titze
National Center of Voice and Speech, and Department of Speech Pathology and Audiology, The University of Iowa, Iowa City 52242, USA
J Acoust Soc Am 112:1064-76. 2002..Results show that oscillation regions in muscle activation control spaces are similar to those measured by other investigations on human subjects... - Nonlinear source-tract interaction in singingIngo R Titze
Dept of Commun Sci and Disord, Univ of Iowa, WJSHC, Iowa City, IA 52242
J Acoust Soc Am 125:2637. 2009..A "lift" of the second harmonic over the first formant becomes a critical skill in acquiring a smooth timbre over a wide pitch range. [Work supported by NIH.]... - A theoretical study of F0-F1 interaction with application to resonant speaking and singing voiceIngo R Titze
Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, IA 52242, USA
J Voice 18:292-8. 2004..Thus, from a voice training and control standpoint, there may be reasons to operate the system in either interactive and noninteractive modes. The harmonics 2F0 and 3F0 can also benefit from being positioned slightly below F1... - Regulating glottal airflow in phonation: application of the maximum power transfer theorem to a low dimensional phonation modelIngo R Titze
Department of Speech Pathology and Audiology, Wendell Johnson Speech and Hearing Center, The University of Iowa, Iowa City 52242 1012, USA
J Acoust Soc Am 111:367-76. 2002..A full update of the equations used for simulating driving pressures, glottal flow, and vocal tract input pressures is provided as a programming guide for those interested in model development... - Strain distribution in an elastic substrate vibrated in a bioreactor for vocal fold tissue engineeringI R Titze
Department of Speech Pathology and Audiology, National Center for Voice and Speech, The University of Iowa, Iowa City, IA 52242, USA
J Biomech 38:2406-14. 2005..A yet unsolved problem is a variable drag coefficient along the length of the material due to fluid turbulence in the culture medium... - Nonlinear source-filter coupling in phonation: vocal exercisesIngo Titze
National Center for Voice and Speech, The Denver Center for the Performing Arts, Denver, Colorado, USA
J Acoust Soc Am 123:1902-15. 2008.... - Refinements in modeling the passive properties of laryngeal soft tissueEric J Hunter
National Center for Voice and Speech, The Denver Center for the Performing Arts, Denver, CO 80204, USA
J Appl Physiol 103:206-19. 2007..ncvs.org/ncvs/library/tech) in which comprehensive muscle data and sensitivity analysis, as well as downloadable data files and computer scripts, are made available... - Measurement of vocal doses in speech: experimental procedure and signal processingJan G Svec
National Center for Voice and Speech, The Denver Center for the Performing Arts, 1245 Champa Street, Denver, CO 80204, USA
Logoped Phoniatr Vocol 28:181-92. 2003..The doses measure the vocal load and can be used for studying the effects of vocal fold tissue exposure to vibration... - Design and validation of a bioreactor for engineering vocal fold tissues under combined tensile and vibrational stressesIngo R Titze
Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, IA 52242, USA
J Biomech 37:1521-9. 2004..The results indicate that vibratory strain alters the expression levels of many extracellular matrix-related genes, as well as the spatial distribution of cells and matrix... - Voice training and therapy with a semi-occluded vocal tract: rationale and scientific underpinningsIngo R Titze
The University of Iowa, Iowa City, USA
J Speech Lang Hear Res 49:448-59. 2006..Little has been done, however, to provide the scientific underpinnings. The purpose of the study was to investigate the underlying physical principles behind the training and therapy approaches that use semi-occluded vocal tract shapes... - Theoretical analysis of maximum flow declination rate versus maximum area declination rate in phonationIngo R Titze
The University of Iowa, Iowa City, USA
J Speech Lang Hear Res 49:439-47. 2006..The purpose of this theoretical study was to show the possible contributions of air inertance and MADR to MFDR... - Differential cell adhesion to vocal fold extracellular matrix constituentsTannin J Fuja
National Center for Voice and Speech, Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, IA 52242, USA
Matrix Biol 25:240-51. 2006..Our results are important in understanding vocal fold pathologies, wound healing, scarring, and in developing an accurate organotypic model of the vocal folds... - The human instrumentIngo R Titze
Department of Speech Pathology and Audiology, University of Iowa, USA
Sci Am 298:94-101. 2008 
Phonation threshold pressure predictions using viscoelastic properties up to 1,400 Hz of injectables intended for Reinke's spaceSarah A Klemuk
Department of Communication Sciences and Disorders, The University of Iowa, 334B SHC, Iowa City, IA 52242, USA
Laryngoscope 120:995-1001. 2010....- Sensitivity of elastic properties to measurement uncertainties in laryngeal muscles with implications for voice fundamental frequency predictionEric J Hunter
National Center for Voice and Speech, The Denver Center for the Performing Arts, Denver, Colorado 80204, USA
J Voice 21:641-50. 2007..Refinements on isolated muscle experimental protocols are proposed that pay greatest attention to measures of highest sensitivity... - The perception of two vocal qualities in a synthesized vocal utterance: ring and pressed voiceChristine C Bergan
Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, IA 52240, USA
J Voice 18:305-17. 2004..Listeners demonstrated highly variable perceptions in both continua with poor intersubject, intrasubject, and intergroup reliability... - Cell viability viscoelastic measurement in a rheometer used to stress and engineer tissues at low sonic frequenciesSarah A Klemuk
National Center for Voice and Speech at the Department of Communication Sciences and Disorders, The University of Iowa, Iowa City, Iowa 52242, USA
J Acoust Soc Am 124:2330-9. 2008..Resulting strain was quantified throughout the test period. Rheologic data and cell viability are reported for each condition, and future improvements are discussed... - Changes in expression of extracellular matrix genes, fibrogenic factors, and actin cytoskeletal organization in retinol treated and untreated vocal fold stellate cellsTannin J Fuja
National Center for Voice and Speech, Department of Speech Pathology and Audiology, University of Iowa, 330 Wendell Johnson Speech and Hearing Center, Iowa City, IA 52242, USA
Matrix Biol 25:59-67. 2006..Furthermore, our results implicate VFSC activation in ECM misregulation which is a hallmark of several laryngeal pathologies... - Active and passive properties of canine abduction/adduction laryngeal musclesFariborz Alipour
Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, 52242, USA
J Voice 19:350-9. 2005..The tetanic force response times of these muscles are also similar, with a maximum rate of force increase of 0.14 N/ms... - Viscoelastic properties of three vocal-fold injectable biomaterials at low audio frequenciesSarah A Klemuk
Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, IA, USA
Laryngoscope 114:1597-603. 2004..Previous measurements of viscoelastic properties of Zyderm were to be extended to low audio frequencies, and properties of two other biomaterials not previously measured, thiolated hyaluronic acid (HA-DTPH) and Cymetra, were obtained... - Transdifferentiation of vocal-fold stellate cells and all-trans retinol-induced deactivationTannin J Fuja
National Center for Voice and Speech, Department of Speech Pathology and Audiology, University of Iowa, 330 Wendell Johnson Speech and Hearing Center, IA 52242, Iowa City, USA
Cell Tissue Res 322:417-24. 2005..These data establish a new and distinct cellular target for future investigations of the viscoelastic properties of the vocal-fold mucosa during normal phonation, aging, vocal-fold scarring, laryngeal fibrosis, and myofibroblastoma... - Effects of fabrication parameters on viscoelastic shear modulus of 2,3-dialdehydecellulose membranes--potential scaffolds for vocal fold lamina propria tissue engineeringPriyanka Roychowdhury
Division of Pharmaceutics, College of Pharmacy, The University of Iowa, Iowa City, IA, USA
J Biomed Mater Res A 88:680-8. 2009..The upper frequency limit of rheologic measurement was a limitation of the study and should be addressed in future investigations... - A three-dimensional model of vocal fold abduction/adductionEric J Hunter
National Center for Voice and Speech, The Denver Center for the Performing Arts, Denver, Colorado 80204, USA
J Acoust Soc Am 115:1747-59. 2004..Other insights into the mechanisms of abduction/adduction were given... - A two-dimensional biomechanical model of vocal fold posturingIngo R Titze
Department of Speech Pathology and Audiology, The University of Iowa, Iowa City 52242, USA
J Acoust Soc Am 121:2254-60. 2007..A repeated adductory-abductory gesture in the form /hi-hi-hi-hi-hi/ is modeled with electromyographic inputs. Movement and acoustic outputs are compared between simulation and measurement... - A reflex resonance model of vocal vibratoIngo R Titze
National Center for Voice and Speech, and Department of Speech Pathology and Audiology, The University of Iowa, Iowa City 52242, USA
J Acoust Soc Am 111:2272-82. 2002..It is shown that singers appear to increase the gain in the reflex loop to cultivate the vibrato, which grows out of a spectrum of 0-15-Hz physiologic tremors in raw form... - Objective measurement of vocal fatigue in classical singers: a vocal dosimetry pilot studyThomas Carroll
University of Colorado at Denver and Health Sciences Center, Department of Otolaryngology, Denver, Colorado 80262 0001, USA
Otolaryngol Head Neck Surg 135:595-602. 2006..To collect objective vibration dose data on singers and relate them to subjective measurements of vocal fatigue... - Voicing and silence periods in daily and weekly vocalizations of teachersIngo R Titze
National Center for Voice and Speech, The Denver Center for the Performing Arts, Denver, Colorado 80204, USA
J Acoust Soc Am 121:469-78. 2007..The study begins to lay the groundwork for understanding vocal fatigue in terms of repetitive motion and collision of tissue, as well as recovery from such mechanical stress... - Adaptation of a Pocket PC for use as a wearable voice dosimeterPeter S Popolo
National Center for Voice and Speech, The Denver Center for the Performing Arts Denver, CO 80204, USA
J Speech Lang Hear Res 48:780-91. 2005..Technical issues include transducer selection, dynamic range, frequency response, memory requirements, power requirements, attachment, cables, connections, and data collection. Advantages and disadvantages of the design are discussed... - Qualification of a quantitative laryngeal imaging system using videostroboscopy and videokymographyPeter S Popolo
National Center for Voice and Speech, The Denver Center for the Performing Arts Denver, CO 80204, USA
Ann Otol Rhinol Laryngol 117:404-12. 2008.... - Phonation threshold pressure measurement with a semi-occluded vocal tractIngo R Titze
National Center for Voice and Speech, The Denver Center for the Performing Arts, Denver, CO, USA
J Speech Lang Hear Res 52:1062-72. 2009..This is in contrast to the shutter technique, where an alternation between a fully occluded tract and an unoccluded tract is used... - Vocal fold elasticity of the Rocky Mountain elk (Cervus elaphus nelsoni) - producing high fundamental frequency vocalization with a very long vocal foldTobias Riede
National Center for Voice and Speech, Denver, CO 80204, USA
J Exp Biol 211:2144-54. 2008..The relationships between an individual's average fundamental frequency, vocal fold length and body size are discussed... - Quantifying vocal fatigue recovery: dynamic vocal recovery trajectories after a vocal loading exerciseEric J Hunter
National Center for Voice and Speech, The Denver Center for the Performing Arts, Denver, Colorado, USA
Ann Otol Rhinol Laryngol 118:449-60. 2009..We quantified the recovery of voice following a 2-hour vocal loading exercise (oral reading)... - Variations in intensity, fundamental frequency, and voicing for teachers in occupational versus nonoccupational settingsEric J Hunter
National Center for Voice and Speech, The University of Utah, Salt Lake City, UT, USA
J Speech Lang Hear Res 53:862-75. 2010..In this study, the authors created a more concise picture of the vocal demands placed on teachers by comparing occupational voice use with nonoccupational voice use... - Comparison of the produced and perceived voice range profiles in untrained and trained classical singersEric J Hunter
National Center for Voice and Speech, The Denver Center for the Performing Arts, Denver, CO 80204, USA
J Voice 20:513-26. 2006.... - Individual subject laryngeal dimensions of multiple mammalian species for biomechanical modelsEric J Hunter
National Center for Voice and Speech, Denver Center for the Performing Arts, Denver, Colorado, USA
Ann Otol Rhinol Laryngol 114:809-18. 2005..Eventually, this would lead to modeling patient-specific laryngeal disorders and the prediction of therapeutic outcomes. An electronic downloadable version of the database is made available to assist in this effort... - Vocal range and intensity in actors: a studio versus stage comparisonKate A Emerich
National Center for Voice and Speech, The Denver Center for the Performing Arts, Denver, CO 80204, USA
J Voice 19:78-83. 2005..It is hypothesized that these actors may stress their vocal mechanism during performance and are more likely candidates for vocal injury... - Estimation of sound pressure levels of voiced speech from skin vibration of the neckJan G Svec
National Center for Voice and Speech, The Denver Center for the Performing Arts, Denver, Colorado 80204, USA
J Acoust Soc Am 117:1386-94. 2005..5 dB less accurate than the mean SPL. The estimation accuracy for instantaneous SPLs was worse than for the mean and equivalent SPLs (on average +/-6 and +/-5 dB for males and females, respectively)... - Protocol challenges for on-the-job voice dosimetry of teachers in the United States and FinlandJohn Nix
National Center for Voice and Speech, Denver, Colorado, USA
J Voice 21:385-96. 2007..The recommendations are based on the authors' experiences with long-term, on-the-job voice dosimetry of large subject groups of teachers in the United States and Finland... - An investigation of cricoarytenoid joint mechanics using simulated muscle forcesDavid A Berry
Department of Speech Pathology and Audiology, National Center for Voice and Speech, The University of Iowa, Iowa City, USA
J Voice 17:47-62. 2003.... - Comparison of human, canine, and ovine laryngeal dimensionsMoon Jung Kim
Department of Speech Pathology and Audiology, National Center for Voice and Speech, The University of Iowa, Iowa City, Iowa, USA
Ann Otol Rhinol Laryngol 113:60-8. 2004..Also, the lack of a definite border between the true and false vocal folds revealed that the ovine model may not always be suitable for a direct comparison to the human larynx in phonation... - Dependence of phonation threshold pressure on vocal tract acoustics and vocal fold tissue mechanicsRoger W Chan
Otolaryngology Head and Neck Surgery, University of Texas Southwestern Medical Center, Dallas, Texas 75390 9035, USA
J Acoust Soc Am 119:2351-62. 2006.... - Biological mechanisms underlying voice changes due to dehydrationKatherine Verdolini
School of Health and Rehabilitation Sciences, University of Pittsburgh, PA 15260, USA
J Speech Lang Hear Res 45:268-81. 2002..In contrast, no evidence was seen that DH accomplished either secretory dehydration or PTP shifts. The results indicate that systemic dehydration can mediate PTP increases. The influence of secretory dehydration on PTP is unclear... - Functional definitions of vocal fold geometry for laryngeal biomechanical modelingNiro Tayama
Department of Otolaryngology, University of Tokyo, Japan
Ann Otol Rhinol Laryngol 111:83-92. 2002..The results showed that geometric changes of the vocal fold induced by freezing are likely reversed by thawing, such that the measurements made on thawed larynges are reliable approximations of the actual vocal fold dimensions...