UI Communication Sciences and Disorders: personnel

Email: paul-abbas@uiowa.edu
Office #: Room 127B SHC
319 / 335-8733

Joint appointment
Department of Otolaryngology-Head & Neck Surgery

Research interests
Paul Abbas's research interest focuses on auditory physiology with emphasis on electrical stimulation of the ear. Studies include the application of electrophysiological measures in cochlear implant users as well as basic research and modeling of the response properties of the auditory nervous system to electrical stimulation.

Auditory Physiology Laboratory

Related Web Sites
Neural Prosthesis Program Contract Progress Reports
NIH Neural Prosthesis Program

Selected publications
Miller, C.A., Abbas, P.A. & Robinson, B.K. (2001). Response Properties of the Refractory Auditory Nerve Fiber. JARO, 2, 216-232.

Miller, C.M., Robinson, B.K., Rubinstein, J.T., Abbas, P.J. & Samuelson, C.R. (2001). Auditory nerve responses to monophasic and biphasic electric stimuli. Hearing Research, 151, 79-99.

Miller, C.M., Abbas, P.J., & Brown, C.J. (2000) A new method of reducing stimulus artifact in the electrically evoked whole nerve potential. Ear and Hearing. 21, 280-290.

Purdy S.J. & Abbas P.J. (2002) ABR thresholds to tonebursts gated with Blackman and linear windows in adults with high frequency sensorineural hearing loss. Ear and Hearing, 23, 358-68

Gantz, B.J., Tyler, R.S., Rubinstein, J.T., Wolaver, A., Lowder, M., Abbas, P.J., Brown, C.J., Hughes, M.L. & Preece, J.P. (2002). Binaural cochlear implants: Results of subjects implanted bilaterally during the same operation. Otology & Neurotology, 23, 169-180.

Miller, C.M. Abbas, P.J. Nourski, K.V. Hu, N. Robinson, B.K. (2003) Electrode configuration influences action potential initiation site and ensemble stochastic response properties. Hearing Research, 175, 200-214.

Hu, N., Abbas, P.J. Miller, C.A., Robinson, B.K., Nourski, K.V., Jeng, F.C., Abkes, B.A., Nichols, J.M. (2003). Auditory Response to Intracochlear Electric Stimuli following Furosemide Treatment. Hearing Research, 185 77-89.

Mino, H., Rubinstein, J.T., Miller, C.A., Abbas, P.A. (2003). Effects of Electrode-to-Fiber Distance on Temporal Jitter with Electrical Stimulation. IEEE-TBME.

Abbas, P.J. & Miller C.A. (2004) Biophysics and Physiology. In Cochlear Implants, (eds F-G. Zeng, R. Fay and A. Popper) Springer-Verlag.

Abbas, P.J., Hughes, M.L., Brown, C.J., Miller, C.A., South, H. (2004). Channnel interaction in cochlear implant users evaluated using the electrically evoked compound action potential. Audiology and Neurotology, 9, 203-23.

Email: ruth-bentler@uiowa.edu
122-B Speech & Hearing Center
319 / 335-8723

Lab website
Hearing Aid Lab

Research interests
Hearing aid technology with emphasis in evaluation of device effectiveness and user satisfaction.

Publications
Bentler, R., Wu, Y-H., Kettel, J., Hurtig, R. (Submitted). Digital Noise Reduction: Outcomes from field and lab studies. International Journal of Audiology.

Ou, H., Bentler, R.A., Dunn, C. (Submitted). Comparison of unilateral cochlear implant adult users and those that use hearing aids and cochlear implants in opposite ears by Satisfaction with Amplification in Daily Life (SADL) scale. International Journal of Audiology.

Shin, M, Wang, S., Bentler, R., He, S. (2007). New feedback detection method for performance evaluation of hearing aids. Sound and Vibration, 302:350-360.

Wu, Y-H., Bentler, R.A. (2007). Using a signal cancellation technique to assess adaptive directivity of hearing aids. Journal of the Acoustical Society of America, 122(1): 496-511.

Henning, R. & Bentler, R. (In Press). Compression and the short-term dynamic range of speech. Journal of Speech-Language-Hearing Research.

Dittberner, A.B. & Bentler, R.A. (2007). Predictive measures of directional benefit. Part 1: A three-dimensional, instrument-based approach to estimating the Directivity Index (DI). Ear & Hearing, 28(1):26-45.

Dittberner, A.B. & Bentler, R.A. (2007). Predictive measures of directional benefit. Part 2: Verification of different approaches to estimating directional benefit. Ear & Hearing, 28(1):46-61.

Palmer, C.P., Bentler, R.A., Mueller, H.G., & Ruscetta, M. (In Press). Self-perceived localization ability with an adaptive directional microphone. American Journal of Audiology.

Bentler, R.A., Chiou (2006). Digital Noise Reduction: An Overview. Trends in Amplification, 10(2):71-82.

Palmer, C., Bentler, R. & Mueller, H.G. (2006). Amplification and the perception of annoying and aversive sounds. Trends in Amplification, 10(2):95-104.

Bentler, R., Palmer, C., & Mueller, H.G. (2006). Evaluation of a second-order directional microphone hearing aid: Speech perception outcomes. Objective test measures. Journal of American Academy of Audiology, 17: 179-189.

Palmer, C., Bentler, R. & Mueller, H.G. (2006). Evaluation of a second-order directional microphone hearing aid: Self-report outcomes. Self-Report outcomes. Journal of American Academy of Audiology, 17: 190-201.

Mueller, H.G., and Bentler, R.A. (2005). Fitting hearing aids using clinical measures of loudness discomfort levels: An systematic review of effectiveness. Journal of American Academy of Audiology, 16:465-477.

Henning, R. & Bentler, R. (2005). Compression-dependent differences in hearing aid gain between speech and non speech signals. Ear and Hearing, 26(4), 409-422.

Bentler, R., Egge, J., Tubbs, J., Dittberner, A. & Flamme, G. (2004). Quantification of directional benefit across different polar response patterns. Journal of the American Academy of Audiology, 15, 649-659.

Bentler, R., Tubbs, J., Egge, J., Flamme, G., & Dittberner, A. (2004). Evaluation of an adaptive directional system in a dsp hearing aid. American Journal of Audiology, 13, 73-79.

Bentler, R., Palmer, C. & Dittberner, A. (2004). Hearing in noise: Comparison of listeners with normal and (aided) impaired hearing. Journal of the American Academy of Audiology, 15, 216-225.

Bentler, R., Niebuhr, D., Johnson, T., & Flamme, G. (2003). Impact of digital labeling on outcome measures. Ear & Hearing, 24, 215-224.

Warner, R. & Bentler, R. (2002). Threshold of discomfort for complex stimuli: Acoustic and sound quality predictors. Journal of Speech-Language-Hearing Research, 45(5),1016-1026 .

Novick, M., Bentler, R., Dittberner, A., & Flamme, G. (2001). The effects of release time and directionality on unilateral and bilateral hearing aid fittings in complex sound fields. Journal of the American Academy of Audiology, 12, 493-504.

Bentler, R.A. & Nelson, J.A. (2001). Effect of spectral shaping on loudness discomfort. Journal of the American Academy of Audiology, 12(8), 431-437.

Bentler, R. & Cooley, L. (2001). An examination of several characteristics that affect the prediction of OSPL90. Ear & Hearing, 22, 3-20.

Bentler, R.A. (2000). List equivalency and test-retest reliability of the Speech in Noise (SIN) test. American Journal of Audiology: A Journal of Clinical Practice, 9, 3-10. Editors Award

Bentler, R.A. & Duve, M. (2000). Comparison of hearing aids over the 20th Century. Ear and Hearing, 21, 625-639.

Bentler, R. & Kramer, S. (2000). Guidelines for choosing an outcome measure. Ear & Hearing, 21, 37S-49S.

Email: carolyn-brown@uiowa.edu
127-A Speech & Hearing Center
319 / 335-8734

Research interests
Auditory physiology with emphasis in electrically evoked potentials and cochlear implants.

Publications
Abbas, P.J., Brown, C.J., Shallop, J.K., Firszt, J.B., Hughes, M.L., Hong, S.H., and Staller, S.J. (1999). Summary of results using the Nucleus CI24M implant to record the electrically evoked compound action potential (EAP). Ear and Hearing. 20 (1), 45-59.

Brown, C.J., Hughes, M., Lopez, S.M. and Abbas, P.J. (1999) The relationship between EABR thresholds and levels used to program the Clarion speech processor. Annals Otology, Rhinology, Laryngology. Suppl 177, 108, 50-57.

Brown, C.J., Abbas, P.J. and Gantz, B.J. (1998). Auditory Nerve Potentials Recorded Using the Neural Response Telemetry System of the Nucleus CI24M Cochlear Implant: Preliminary Data. American Journal of Otology.

Brown, C.J., Abbas, P.J., Borland, J., Bertschy, M. (1996) Electrically evoked whole nerve action potentials in Ineraid cochlear implant users and their relationship to psychophysical performance. Journal of Speech and Hearing Research, 39, 453-467.

Brown, C.J., Abbas, P.J., Bertschy, M., Tyler, R., Lowder, M., Takahashi, G., Purdy, S., and Gantz, B.J. (1995). Longitudinal Assessment of Physiological and Psychophysical Measures in Cochlear Implant Users. Ear and Hearing, 16, 1-11.

Brown, C.J., Abbas, P.J., Fryauf-Bertschy, H., Kelsay, D. and Gantz, B.J. (1994) Intraoperative and Postoperative Electrically Evoked Auditory Brainstem Responses (EABR) in Nucleus Cochlear Implant Users: Implications for the Fitting Process. Ear and Hear, 15, 168-176.

Gantz, B.J., Brown, C.J., and Abbas, P.J. (1994). Intraoperative measures of the electrically evoked auditory nerve compound action potential. American J. of Otology, 15, 137-144.

Email: eileen-finnegan@uiowa.edu
127-D Speech & Hearing Center
319 / 335-8717

Professional interests
Eileen Finnegan's research is in the area of laryngeal neurophysiology. More specifically, my interest is in studying the role of laryngeal/respiratory reflexes during phonation.

Publications
Finnegan EM,Luschei ES,Barkmeier JM,Hoffman HT,Synchrony of laryngeal muscle activity in persons with vocal tremor. Archives of Otolaryngology--head & Neck Surgery. 129(3):313-8. March 2003.

Van Daele DJ,Finnegan EM,Rodnitzky RL,Zhen W,McCulloch TM,Hoffman HT,Head and neck muscle spasm after radiotherapy: management with botulinum toxin A injection. Archives of Otolaryngology--head & Neck Surgery. 128(8):956-9. Aug 2002.

Titze, I.R,Finnegan, E.M,Laukkanen, A.M,Jaiswal, S,Raising Lung Pressure and Fo in Vocal Warm-Ups: The Use of Flow-Resistant Straws. Journal of Singing. 58:329-338. 2002.

Finnegan EM,Luschei ES,Hoffman HT,Modulations in respiratory and laryngeal activity associated with changes in vocal intensity during speech. Journal of Speech, Language, and Hearing Research: Jslhr. 43(4):934-50. August 2000.

Finnegan EM,Luschei ES,Hoffman HT,Estimation of alveolar pressure during speech using direct measures of tracheal pressure. Journal of Speech, Language, and Hearing Research: Jslhr. 42(5):1136-47. October 1999.

Finnegan EM,Luschei ES,Gordon JD,Barkmeier JM,Hoffman HT,Increased stability of airflow following botulinum toxin injection. Laryngoscope. 109(8):1300-6. August 1999.

Scherer RC,Alipour F,Finnegan E,Guo CG,The membranous contact quotient: a new phonatory measure of glottal competence. Journal of Voice. 11(3):277-84. September 1997.

Alipour F,Scherer RC,Finnegan E,Pressure-flow relationships during phonation as a function of adduction. Journal of Voice. 11(2):187-94. June 1997.

Finnegan EM,Luschei ES,Barkmeier JM,Hoffman HT,Sources of error in estimation of laryngeal airway resistance in persons with spasmodic dysphonia. Journal of Speech and Hearing Research. 39(1):105-13. February 1996.

Luschei ES, Finnegan EM,Electromyographic techniques for the assessment of motor speech disorders, M.R. McNeil (Ed.). Clinical management of sensorimotor speech disorders. 149-176. 1996.

Min YB,Finnegan EM,Hoffman HT,Luschei ES,McCulloch TM,A preliminary study of the prognostic role of electromyography in laryngeal paralysis. Otolaryngology - Head and Neck Surgery. 111(6):770-5. December 1994.

Min YB,Luschei ES,Finnegan EM,McCulloch TM,Hoffman HT,Portable telemetry system for electromyography. Otolaryngology - Head and Neck Surgery. 111(6):849-52. December 1994.

Karnell MP,Finnegan EM,Tools for voice measurement. Current opinion in Otolaryngology & Head and Neck Surgery. 2:240-246. 1994.

Lavertu P, Scott SE, Finnegan EM, Levine HL, Tucker HM, Wood BG, Secondary tracheoesophageal puncture for voice rehabilitation after laryngectomy. Archives of Otolaryngology--head & Neck Surgery. 115(3):350-5. March 1989.

Email: jean-k-gordon@uiowa.edu
125-B Speech & Hearing Center
319 / 335-8729

Research
My research focuses on the process of word retrieval in normal speakers, and in speakers with acquired neurogenic language disorders (particularly aphasia). I am interested in exploring the factors which make words easier or harder to retrieve, and how these factors influence the production of speech errors. To investigate these questions, I use a combination of behavioural experimentation and computational modeling approaches.

Selected Publications
Gordon, J.K. (in press). A quantitative analysis of picture description. Aphasiology.

Dell, G.S., Lawler, E.N., Harris, H.D. & Gordon, J.K. (2004). Models of errors of omission in aphasic naming. Cognitive Neuropsychology, 21(2/3/4), 125-145 .

Gordon, J.K. & Dell, G.S. (2003). Learning to divide the labor: An account of deficits in light and heavy verb production, Cognitive Science , 27(1), 1-40 .

Gordon, J.K. (2003). Review of Assessment of Aphasia , 2003, O. Spreen & A.H. Risser, Oxford University Press: New York , NY . Clinical Neurophysiology , 115, 242-244 .

Dell, G.S. & Gordon, J.K. (2003). Neighbors in the lexicon: Friends or foes? In Phonetics and phonology in language comprehension and production: Differences and similarities, N.O. Schiller and A.S. Meyer (eds), New York , NY : Mouton de Gruyter.

Gordon, J.K. (2002). Phonological neighborhood effects in aphasic speech errors: Spontaneous and structured contexts, Brain and Language, 82, 113-145 .

Baum, S.R., Pell, M.D., Leonard, C.L. & Gordon, J.K. (2001). Using prosody to resolve temporary syntactic ambiguities in speech production: Acoustic data on brain-damaged speakers, Clinical Linguistics & Phonetics, 15(6), pp. 441-456.

Gordon, J.K. (1999). Clinical forum: Can learning theory teach us about aphasia therapy? (a reply to Ferguson ), Aphasiology , 13(2), pp. 134-140.

Gordon, J.K. (1998). The fluency dimension in aphasia. Aphasiology, 12(7/8), 673-688 .

Gordon, J.K. (1998). Clinical forum: A meta-theory of aphasiology: Deficit or asset? (a reply to Petheram & Parr), Aphasiology, 12(6), 468-473.

Baum, S.R., Pell, M.D., Leonard, C. & Gordon, J.K. (1997). The ability of right- and left-hemisphere-damaged individuals to produce and interpret prosodic cues marking phrase boundaries. Language and Speech, 40(4), 313-330 .

Gordon, J.K. (1997). Bridging the gap between theory and practice...or burning our bridges? Aphasiology, 11(9), 845-854 .

Gordon, J. K. & Baum, S. R. (1994). Rhyme priming in aphasia: The role of phonology in lexical access. Brain and Language, 47, 661-683.

Email: penelope-hall@uiowa.edu
120-E Speech & Hearing Center
319 / 335-8703

Research
Major research interests involve the speech disorder of developmental apraxia of speech (DAS), including descriptiions of various aspects of the disorder, as well as the development of materials which have direct applicability to clinicians when dealing with this population of children.

Publications
Hall, P.K., Jordan, L.s. & Robin, D.A. (1993). Developmental Apraxia of Speech:Theory and Clinical Practice. Austin, TX: Pro-Ed. (Primary author for chapters 2, 4 ,5, 6, 7, 8, 9,10.).

Hall, P.K. (1995). Childhood articulation disorders of neurogenic origins. In M.M. Leahy (Ed.), Disorders of Communication: The Science of Intervention, 2nd. Edition, (pp.121 - 137). London: Whurr Publishers Limited.

Hall, P.K. (In Press). A letter to the parent(s)of a child with developmental apraxia of speech. Part I: Speech characteristics of the disorder. Language, Speech, and Hearing Services in Schools.

Hall, P.K. (In Press) A letter to the parent(s) of a child with developmental apraxia of speech. Part II: Nature and cases of DAS. Language, Speech and Hearing Services in Schools.

Hall, P.K. (In Press). A letter to the parent(s) of a child with developmental apraxia of speech. Part III: Other problems often associated with the disorder. Language, Speech and Hearing Services in Schools.

Hall, P.K. (In Press). A letter to the parent(s) of a child with developmental apraxia of speech. Part IV: Treatment of DAS. Language, Speech and Hearing Services in Schools.

Pollock, E.K. & Hall, P.K. (1991). An analysis of the vowel misarticulations of five children with developmental apraxia of speech. Clinical Linguistics and Phonetics, 5, 207-224.

Hall, P.K., Hardy, J.D. & LaVelle, W.E. (1990). A child with signs of developmental apraxia of speech with whom a palatal lift prosthesis was used to manage palatal dysfunction. Journal of Speech and Hearing Disorders, 55, 454-460.

Hall, P.K. (1989). The occurrence of developmental apraxia of speech in a mild articulation disorder. Journal of Communication Disorders, 22, 265-276.

Hall, P.K. & Tomblin, J.B. (1978). A follow-up of children with articulation and language disorders. Journal of Speech and Hearing Disorders, 42, 364-369.

Email: lenore-holte@uiowa.edu
148 Center for Disabilities & Development
319 / 356-1168

Research Interests
Lenore Holte's professional interests include the hearing assessment of children and adults with disabilities, immittance audiometry, and newborn hearing screening.

Publications
Holte, Prickett, Van Dyke, Olson, Lubrica, Knutson, Knutson, and Brennan (2006). Issues in the management of infants and young children who are deaf-blind, Infants and Young Children, 19, 4, 323 - 322.

Holte, Prickett, Van Dyke, Olson, Lubrica, Knutson, Knutson, and Brennan (2006). Issues in the evaluation of infants and young children who are suspected of or who are deaf-blind, Infants and Young Children, 19, 3, 213 – 227.

Holte, L.A. (2003). Early childhood hearing loss: A frequently overlooked cause of speech and language delay, Pediatric Annals, June 2003.

Margolis, RH., Bass-Ringdahl, S., Hanks, W.D., Holte, L., and Zapala, D.A. (2003). Tympanometry in newborn infants - 1kHz Norms. Journal of the American Academy of Audiology, 14, 7, 383-392.

Downey, D., Mraz, R., Knott, J., Knutson, C., Holte, L., and Van Dyke, D. (2002). Diagnosis and evaluation of children who are not talking. Infants and Young Children, 15, 38-48.

Holte, L.A. and Margolis, R.H. (2002). Contemporary research in tympanometry, Current Opinion in Otolaryngology, October 2002.

Bentler, R., Holte, L.A., Turner, C.W. (1999). An update on the acclimatization issue, Hearing Journal, 52,44-46.

Holte, L. A. (1996). Aging effects in multifrequency tympanometry. Ear and Hearing, 17, 12-18.

Holte, L. A., Margolis, R.H., Cavanaugh, R.M. (1991). Developmental changes in multifrequency tympanograms. Audiology, 30,1-24.

Holte, L.A., Cavanaugh, R.M., and Margolis, R.H. (1990). Ear canal wall mobility and tympanometric shape in young infants. Journal of Pediatrics. 77-80.

Holte, L.A. and Margolis, R.H. (1987). Screening tympanometry. Seminars in Hearing, 8, 329-338.

Holte, L.A. and Margolis, R.H. (1987). The relative loudness of third-octave bands of speech. Journal of the Acoustical Society of America. 81, 186-190.

Turner, C.W. and Holte, L.A. (1987). Discrimination of spectral peaks by normal and hearing impaired subjects. Journal of the Acoustical Society of America, 81, 445-451.

Turner, C.W. , Holte, L.A., and Relkin, E. (1987) Auditory filtering and the discrimination of spectral shapes by normal and hearing impaired subjects. Journal of Rehabilitation Research and Development, Fall, 1987, 229-238.

Turner, C.W. and Holte, L.A. (1985). Evaluation of FM amplification systems. Hearing Instruments, 36, 7, 612.

Email: richard-hurtig@uiowa.edu
120-B Speech & Hearing Center
319 / 335-8730

Research
Richard Hurtig's broad research interest is uncovering general invariants of perceptual and cognitive processes involved in human communication.

Laboratory website

Class websites
003:117 Psychology of Language

003:218 Psycholinguistics

Inventions and Patents
Hurtig, R.R., & Turner, C. (2003). Apparatus and Methods for Proportional Audio Compression and Frequency Shifting. U.S. Patent # 6577739, The University of Iowa.

Hurtig, R.R., & Clark, B. (1987). Broadband spectral compression (for sensory aids and signal transmission system). The University of Iowa .

Selected publications
Downey, D & Hurtig, RR (2003). Augmentative & Alternative Communication. Pediatric Annals, 32(7):467-474.

Roch, Marie, Hurtig, RR (2002). The Integral Decode: A Smoothing Technique for Robust HMM-Based Speaker Recognition. IEEE Transactions on Speech & Audio Processing, 10(5):315-324.

O'Leary, DS, Block, RI, Koeppel, JA, Flaum, M, Schultz, SK, Andreasen, NC, Boles Ponto, L, Watkins, GL, Hurtig, RR, & Hichwa, RD (2002). "Effects of Smoking Marijuana on Brain Perfusion & Cognition." Neuropsychopharmacology, 26:802-816.

Block, RI, O'Leary, DS, Hichwa, RD, Augustinack, JC, Boles Ponto, LL, Ghoneim, MM, Arndt, S, Hurtig, RR, et. al (2002). Effects of frequent marijuana use on memory-related regional cerebral blood flow. Pharmacology, Biochemistry & Behavior (72)1:1-14.

Turner, CW & Hurtig, RR (1999). Proportional frequency compression of speech for listeners with sensorineural hearing loss. J.Acoust. Society of America , 106(2):877-886.

Narayana, S., Hichwa, R.D., Ponto, L.L.B., Hurtig, R.R. and Watkins, G.L. (1997). Construction of a whole body blood flow model for use in positron emission tomography imaging with [ 15 O] Water. J of Pharmacokinetics & Biopharm. , Vol. 25 (5).

O'Leary, D.S., Andreasen, N.C., Hurtig, R.R., et al (1997). Auditory and visual attention assessed with PET. Human Brain Mapping, (5):422-436.

Flaum, M., Cizadlo, T., Arndt, S., O'Leary, D.S., Nopoulos, P., Hurtig, R., et. al. (1996). Informing the choice of activiation thresholds in fMRI paradigms. NeuroImage , (3):S59.

O'Leary, D.S., Andreasen, N.C., Hurtig, R.R., Kesler, M.L., Rogers, M., Arndt, S., Cizadlo, T., Watkins, G.L., Ponto, L.L.B., Kirchner, P.T., Hichwa, R.D. (1996). Auditory attentional deficits in patients with schizophrenia: A positron emission tomography (PET) study. Archives of General Psychiatry, 53: 633-641.

Andreasen, N.C., O'Leary, D.S., Arndt, S., Cizadlo, T., Hurtig, R., Rezai, K., Watkins. G.L., Ponto, L.L.B., & Hichwa, R.D. (1996). Neural substrates of facial recognition. J. Neuropsychiatry Clin Neurosci, 8(2): 139-146.

O'Leary, D.S., Hurtig, R.R., Hichwa, R.D., Watkins, G.L., Boles Ponto, L.L., Rogers, M., Kirchner, P.T., & Andreasen , N.C. A Positron Emission Tomography study of binaurally- and dichotically- presented stimuli: Efffects of level of language and directed attention. Brain & Language , (53):20-39, 1996.

Hichwa, RD, O'Leary, DS, Ponto, LLB, Arndt, S, Cizadlo, T, Hurtig, RR, et al (1995). Count vs. Flow: When does it matter? In Quantification of Brain Function Using PET. T Jones, V Cunningham, R Myers & D Bailey (Eds.). New York , NY : Academic Press.

Andreasen, N.C., O'Leary, D.S., Arndt, S., Cizadlo, T., Hurtig, R., Rezai, K., Watkins, G.L., Ponto, L.B., Hichwa, R.D. (1995). Neural substrates of facial recognition. Human Brain Mapping, (Suppl), 1 , 31.

Andreasen, N.C., O'Leary, D.S., Arndt, S., Cizadlo, T., Hurtig, R.R., Rezai, K, Watkins, G.L, Ponto, L.B., and Hichwa, R.D. (1995). Short-term and long-term verbal memory: A positron emission tomography study. Proceedings of National Academy of Science, 92 , 5111-5115.

Hurtig, R.R., Hichwa, R.D., O'Leary, D.S., et al. (1994). The effects of the timing and duration of cognitive activation in [ 15 O]water PET studies. Journal of Cerebral Blood Flow and Metabolism , 14 (3), 423-430.

Kirk, K.I., Tye-Murray, N., & Hurtig, R.R. (1992). The use of static and dynamic vowel cues by multichannel cochlear implant users. Journal of The Acoustical Society of America , 91 (6), 3487-3498.

Rizzo, M., & Hurtig, R. (1992). Visual search in hemineglect: What stirs idle eyes? Clinical Vision Science , 7 (1), 39-52.

Hurtig, R.R. (1991). Perception of spectrally compressed speech. Proceedings of the XIIth International Congress of Phonetic Sciences , 2 , 98-101.

Rizzo, M., & Hurtig, R.R. (1989). The effect of bilateral visual cortex lesions on the development of eye movements and perception. Neurology , 39 , 406-413.

Zimmermann, G.N., Brown, C.J., Kelso, J.A.S., Hurtig, R.R., & Forrest, K. (1988). The association between acoustic and articulatory events in a delayed auditory feedback (DAF) paradigm. Journal of Phonetics , 16 , 437-451.

Rizzo, M., Hurtig, R.R., & Damasio, A.R. (1987). The role of scanpaths in facial recognition and learning. Annals of Neurology , 22 (1), 41-45.

Rizzo, M., & Hurtig, R.R. (1987). Looking but not seeing: Attention, perception and eye movements in simultanagnosia. Neurology , 37 (10), 1642-1648.

Keidar, A., Hurtig, R.R., & Titze, I.R. (1987). The perceptual nature of vocal register change. Journal of Voice , 1 (3), 223-233.

Broselow, E., Hurtig, R.R., & Ringen, C. (1987). The perception of second language prosody. In G. Ioup & S. Weinberger (Eds.), Interlanguage Phonology: The acquisition of a second language sound system . Cambridge , MA : Newbury House.

Collins, M.J., & Hurtig, R.R. (1986). Evaluation of prosthetic devices, in Glattke, T., Collins, M.J., & Harker, L.A. (Eds.), Sensorineural Hearing Loss: Mechanism, Diagnosis and Treatment, Proceedings of the Scott N. Reger Memorial Conference, University of Iowa Press, 277-289.

Collins, M.J., & Hurtig, R.R. (1985). Categorical perception of speech sounds via the tactile modes. Journal of Speech and Hearing Research , 28 (4), 594-598.

Brown, C.J., & Hurtig, R.R. (1983). Children's discourse competence: An evaluation of the development of inferential processes, Discourse Processes: A Multidisciplinary Journal , 6 , 353-375.

Hurtig, R.R. (1982). Cerebral asymmetry in the strategies used in processing random line stimuli, Cortex , 18 , 332-343.

Hurtig, R.R. (1982). Analytic and holistic strategies in the perception of sign, Journal of Visual/Verbal Languaging , 1 (1), 31-36.

Hurtig, R.R., Ensrud, S., & Tomblin, J.B. (1982). The communicative function of question production in autistic children. Journal of Autism and Developmental Disorders , 12 (1), 57-69.

Cirrin, F., & Hurtig, R.R. (1981). Accessing mental representations in retarded children. American Journal of Mental Deficiencies , 86 (2), 188-193.

Dunlap, G.L., & Hurtig, R.R. (1981). Effects of clausal structure and word frequency in sentence processing. Journal of Psycholinguistic Research , 10 (3), 313-326.

Hurtig, R.R. (1978). The validity of clausal processing strategies at the discourse level. Discourse Processes: A Multidisciplinary Journal , 1 (2), 195-202.

Hurtig, R.R. (1977). Toward a functional theory of discourse. In R.O. Freedle (Ed.), Discourse production and comprehension . Norwood , NJ : Ablex.

Bever, T.G., Hurtig, R.R., & Handel, A.B. (1976). Analytic processing elicits right ear superiority in monaurally presented speech. Neuropsychologia , 14 , 175-181.

Bever, T.G., Garrett, M.F., & Hurtig, R.R. (1976). Projection mechanisms in reading, or when the journal review process fails. Journal of Psycholinguistic Research , 5 (2), 215-226.

Bever, T.G., Carroll, J.E., & Hurtig, R.R. (1976). Analogy or ungrammatical sequences that are utterable and comprehensible are the origins of new grammars in language acquisition and linguistic evolution. In T.G. Bever, J.J. Katz, & D.T. Langendoen (Eds.), An integrated theory of linguistic ability . New York : Crowell Press.

Bever, T.G., & Hurtig, R.R. (1975). Detection of a non-linguistic stimulus is poorest at the end of a clause. Journal of Psycholinguistic Research , 4 (1), 1-7.

Bever, T.G., Garrett, M.F., & Hurtig, R.R. (1973). The interaction of perceptual processes and ambiguous sentences. Memory and Cognition , 1 (3), 277-286.

Email: michael-karnell@uiowa.edu
125-D Speech & Hearing Center
319 / 335-6629

Joint appointment
Department of Otolaryngology-Head & Neck Surgery

Related Websites
Department of Otolaryngology-Head & Neck Surgery
Michael Karnell's full CV
Otolaryngology Voice and Swallowing Research Center

Research interests
Normal and disordered laryngeal physiology and voice production, velopharyngeal physiology and resonance disorders with special interest in cleft palate and swallowing disorders.

Publications
Karnell, M.P., Schultz, K., Canady, J. Investigations of a Pressure Sensitive Theory of Marginal Velopharyngeal Inadequacy. Cleft Palate-Craniofacial J., 38, 345-357, 2001

Hoffman, H.T., Overholt, E., Karnell, M., McCulloch, T.M. Vocal process granuloma, Head and Neck, 23, 1060-1072, 2001.

Hoffman, H., McCabe, D., McCulloch, T., Jin, Sung M., Karnell, Michael. Transoral Laryngeal Collagen Injection as an Adjunct to Medialization Laryngoplasty. Laryngoscope, 112(8 Pt 1):1407-1413, 2002 August.

Johnson, L., Karnell, M., and Bailey, P. Using the Web to Enhance Communication between Cleft Palate Specialists and Community Practitioners. Journal of Dental Education. 66:2, #82, 2002.

Canady, J.W., Cable, B.B., Karnell, M.P., Karnell, L.H. Pharyngeal flap surgery: Protocols, complications, and outcomes at the University of Iowa. Otolaryngology-Head and Neck Surgery, 129, 321-326, 2003.

Karnell, M.P., Hansen, J., Hardy, J.C., Lavelle, W.L., Markt, J. Nasality ratings and nasalance measurements as outcome indicies for palatal lift management. Journal of Medical Speech Pathology, 12, 21-29, 2004.

Chang, A., Karnell, M.P. The relationship among vocal fatigue, perceived phonatory effort and phonation threshold pressure. In press Journal of Voice, 2004

Smith C., Finnegan E., Karnell M.P. Resonant Voice: Spectral and Nasendoscopic Analysis. Journal of Voice, In press.

Books
Textbook Handbook of Cleft Palate Speech: A Clinician's Guide to Diagnosis and Therapy. Peterson-Falzone, S.J., Karnell, M.P., Hardin-Jones, M.A., Cardamone, J.E. Mosby, Due: 2004.

Textbook. Peterson-Falzone, S.J., Karnell, M.P., Hardin-Jones, M.A. Cleft Palate Speech. Mosby, 2001.

Textbook. Karnell, M.P. Videoendoscopy: From Velopharynx to Larynx. Singular Publishing Group, 1994.

Email: danielle-kelsay@uiowa.edu
113 Speech & Hearing Center
319 / 335-8754

Clinical/Research Interests
Hearing impairment, its impact on the pediatric population and provision of comprehensive aural (re)habilitation services to hearing impaired children and their families

Publications
Hughes, M.L., Vander Werff, K.R., Brown, C.J., Abbas, P.J., Kelsay, D.M.R., Teagle, H.F.B. & Lowder, M.W. (2001). A Longitudinal Study of Electrode Impedance, the Electrically Evoked Compound Action Potential, and Behavioral Measures in Nucleus 24 Cochlear Implant Users. Ear and Hearing, 22, 471-486.

Spencer, L.J., Tye-Murray, N., Kelsay, D.M.R., Teagle, H. (1998). Learning to use the cochlear implant: A child who beat the odds. American Journal of Audiology, 7, 1, 24-29.

Fryauf-Bertschy, H., Tyler, R.S., Kelsay, D.M.R., Gantz, B.J. & Woodworth, G.P. (1997). Cochlear implant use by prelingually deafened children: The influences of age at implant and length of device use. Journal of Speech and Hearing Research, 40, 183-199.

Kelsay, D.M.R. & Tyler, R. (1996). Advantages and Disadvantages Expected and Realized by Pediatric Cochlear Implant Recipients as Reported by Their Parents. American Journal of Otology, 17, 866-873.

Kelsay, D.M.R. & Tyler, R. (1996). Children and Cochlear Implants, in Hearing Care for Children, (Martin, F. & Clark, J., Eds.). Allyn & Bacon.

Tye-Murray, N., Witt, S., Schum, L., Kelsay, D., & Schum, D. (1994). Feasible Aural Rehabilitation Services for Busy Clinical Settings. American Journal of Audiology, 3, 3, 33-37.

Brown, C.J., Abbas, P.J., Fryauf-Bertschy, H., Kelsay, D. & Gantz, B.J. (1994). Intraoperative and postoperative electrically evoked auditory brain stem responses in Nucleus cochlear implant users: Implication for the fitting process. Ear and Hearing, 15, 168-176.

Tye-Murray, N. & Kelsay, D.M.R. (1993). A communication training program for parents of cochlear implant users. Volta Review, 95, 22-31.

Fryauf-Bertschy, H., Tyler, R.S., Kelsay, D.M. & Gantz, B.J. (1992). Performance over time of congenitally deaf and postlingually deafened children using a multichannel cochlear implant. Journal of Speech and Hearing Research, 35, 4, 913-920.

Tyler, R.S. & Kelsay, D.M. (1990). Advantages and disadvantages reported by some of the better cochlear implant patients. American Journal of Otology, 11, 4, 282-289.

Email: karla-mcgregor@uiowa.edu
121-C Speech & Hearing Center
319 / 335-8724

Research
Dr. McGregor is interested in how children learn words. To address this question, she explores individual differences in word learning by comparing children with specific language impairment or autism to children who are developing normally. She has also explored variation within the population of normal learners including comparisons of children developing at a typical rate and those who are very precocious and comparisons of children from different language communities.

Laboratory website
Word Learning Lab

Selected publications
McGregor, K.K., Sheng, Li, & Smith, B. (in press). The precocious two-year-old: Status of the lexicon and links to the grammar. Journal of Child Language.

McGregor, K.K. & Capone, N.C. (2004). Genetic and environment interactions in determining the early lexicon: Evidence from a set of tri-zygotic quadruplets. Journal of Child Language, 31, 311-337.

Capone, N.C. & McGregor, K.K. (2004). Gesture development: A review for clinicians and researchers. Journal of Speech, Language, and Hearing Research, 47, 173-186.

Sheng, L., McGregor, K.K., & Xu, Y. (2003). Prosodic and lexical-syntactic aspects of the therapeutic register. Clinical Linguistics and Phonetics, 17, 355-363.

McGregor, K.K., Newman, R.M., Reilly, R.M., and Capone, N. (2002). Semantic representation and naming in children with specific language impairment. Journal of Speech, Language, and Hearing Research, 45, 998-1014.

McGregor, K.K. and Appel, A. (2002). On the relation between mental representation and naming in a child with specific language impairment. Clinical Linguistics and Phonetics, 16, 1-20.

McGregor, K.K.