Creating a Mastery Experience During the Voice Evaluation

  • Published on

  • View

  • Download


  • Creating a Mastery Experience Dthe Voice Evaluation

    Heather Shaw Bonilha and Amy Elizabeth Dawson, Charles

    Summary: Objectives. Adherence to treatment is a commorders. Improving their self-efficacy through a mastery experieideal mastery experience gives early and quick evidence that thfor a broad range of patients. This study sought to test whether

    to p

    d pog diaa shoencyd fopre% oof inis durien


    chartsevalualanguastudy,voice tverityof voiwere nlack ofhealthThe

    changemake athroug

    ing toplayay bes stillcon-con-ct onientstagesodifyprevi-

    an in-task.9



    re most success-nce arising fromhavior.9 In order


    Care of th

    Charleston, SC 29425. E-mail:

    Cognitive structures, such as self-efficacy, afully reformed by a personal mastery experiean effective accomplishment or productive be

    Journal of Voice, Vol. 26, No. 5, pp. 665.e1-665.e70892-1997/$36.00 2012 The Voice Foundationdoi:10.1016/j.jvoice.2011.09.004self-efficacy is that they have a better prognosis. The socialcognitive theory proposes and has accrued evidence for foursources of self-efficacy: mastery experience, vicarious experi-ence, verbal persuasion, and emotional-physiological state.6,10

    Voice Conference; September 2011; Marseille, France.From the Department of Health Science and Research, Medical University of South

    Carolina, Charleston, South Carolina.Address correspondence and reprint requests to Heather Shaw Bonilha, Department of

    Health Science and Research, Medical University of South Carolina, 77 President Street,found that 47% of patients who were seen for a voicetion adhered to the recommendation of a speech-ge pathologist (SLP) for voice therapy. In a follow-upHapner et al found that 65% of patients dropped out ofherapy. Patient demographics, quality-of-life impact, se-of dysphonia (consensus auditory perceptual evaluationce), and diagnosis (hyperfunctional vs hypofunctional)ot predictive of patient dropout. It is possible that thisadherence is related to the inherent difficulty in makingbehavior changes.transtheoretical model (TTM) describes health behavioras a process that progresses in a series of stages.3 Tond maintain a health behavior change, one must progressh all stages successfully. The TTM has been studied and

    they could be aware of a possible change but are unwillpursue it. It is also thought that general indecision maya role in the precontemplation stage. That is, a patient maware that a behavior change is possible, but he or she iweighing the pros and cons of making that change.68 Thetemplation stage occurs when a patient is in fact starting tosider making a behavior change, but he or she has yet to athe thought. The preparation stage is characterized by a patresolve to pursue change. The action and maintenance sare regarded as the period when a person takes steps to mhis or her behavior and prevent relapse or recycling intoous stages.6,7

    Important to the TTM is the concept of self-efficacy ordividuals confidence in his or her ability to accomplish aSelf-efficacy is necessary to achieve and maintain behchange, and, fortunately, it is changeable within an indiviA commonly observed characteristic in patients with h

    ted for publication September 15, 2011.s of this study were presented at the 39th Symposium of The Voice Foundation:e Professional Voice; June 2010; Philadelphia, Pennsylvania, and the Pan Europeanapy.1,2 In 2006, Portone et al in a retrospective review of 294 changed or that a change would be beneficial. Congruently,produce sufficient change in acoustic analysis measuresa potentially useful mastery experience.Study Design. Prospective, repeated measures, pre- anMethods. Twenty-four consecutive patients with varyinstudy. Acoustic analysis was completed before and afteranalysis parameters evaluated include fundamental frequbulence index. Data pre- and posttreatment were analyzeResults. Results demonstrated a significant change fromsitioning from being outside to within normal limits, in 75itive change in one or more of the three acoustic measuresConclusion. Pairing a trial therapy with acoustic analysFuture research is needed to determine if this mastery expement outcomes.Key Words: VoiceEvaluationMastery experienceSel

    INTRODUCTIONA common difficulty experienced by clinicians is engagingtheir patients in treatment. Most treatment typically involveshealth behavior changes. This is especially true for patientswho require voice treatment. For successful health behaviorchanges, a patient must have sufficient self-efficacy andmotiva-tion to engage in and continue voice therapy. It is documentedthat many patients with voice disorders do not adhere to ther-uring

    ton, South Carolina

    on challenge when working with patients with voice dis-nce has the potential to improve treatment adherence. Ane patient will be successful with the treatment and worksa brief stimulability trial of forward focused voice couldrovide visibly improved objective results and, thus, be

    sttreatment.gnoses referred for a voice evaluation participated in thisrt stimulability trial of forward focused voice. Acoustic, jitter, shimmer, noise-to-harmonic ratio, and voice tur-r change and compared with normative values.- to posttrial, as indicated by the objective measure tran-f patients (P 0.000). When less rigid criterion of a pos-terest is used, improvement was noted in 96% of patients.ring a voice evaluation is a possible mastery experience.ce improves self-efficacy, treatment adherence, and treat-

    cacyAcoustic analysis.

    used as a behavior change assessment technique for a number ofhealth concerns. Researchers have determined the TTM to beeffective and useful for physical activity exercise, alcohol con-sumption, and smoking cessation.4,5

    There are five stages of change described in the TTM. Pre-contemplation, the first stage, occurs when a patient is not yetconsidering behavioral therapy. This can be attributed to thepatient being unaware that a problem behavior needs to be

  • and the Lee Silverman voice treatment.

    Journal of Voice, Vol. 26, No. 5, 2012665.e2for a mastery experience to be successful in improving patientsconfidence in therapy, it must be easily interpretable by patientsas presenting an improvement and prove advantageous for mostpatients.For patients with voice disorders, the first opportunity at pro-

    viding amastery experience is in the initial evaluation with stim-ulability trials. A patients presence or absence of stimulabilityfor therapy must be assessed to determine an appropriate treat-ment plan. The stimulability trial can also be used to determinewhether or not a patient believes that a certain treatment has thepotential to relieve their symptoms. This time point generally re-lates to the precontemplation or contemplation stages of theTTM, making it an ideal time to increase a patients self-efficacy. Patients may be in the precontemplation stage at thevoice evaluation because, although they have been referred toan SLP, theymay not yet know the extent towhich their behaviorneeds changing or that a change would even be beneficial. Pa-tients are in the process of learning about their behavior andits negative impacts on the voice and weighing the pros andcons to modifying the behavior. Once they are knowledgeableabout their condition and the health behavior changes suggestedby the SLP, they maymove onto the contemplation stage. This iswhen the patients are not yet resolved to engage in therapy or putin the effort required to modify their behavior, and/or, they arenot yet convinced that the therapy the SLP has to offer will, infact, prove beneficial. The patients are actively acquiring infor-mation about their condition at this point, acknowledging thatthey have a problem, and investigating their treatment options.Patients may present to the voice evaluation in either the precon-templation or the contemplation stage. When patients move tothe contemplation stage, they are actively seeking evidence sup-porting the efficacy of voice therapy; therefore, patients in thisstage are prone to benefit from cognitive methodologies usedto increase motivation.8 The use of the treatment stimulabilitytechnique proposed in this article may be helpful in movingpatients from the precontemplation and contemplation stagesto the preparation, action, and maintenance stages and inpreventing reversion into the previous stages.Before evaluating the outcome of a mastery experience for

    improving a patients self-efficacy, adherence to therapy, orvoice quality, we needed to develop a viable mastery experiencerelevant to most patients. The first step was to identify a voicetherapy approach to use for the stimulability trial that wouldbenefit and not harm the largest number of patients whilequickly providing notable voice improvement. Based on typicalpractice patterns and the authors clinical biases, a forwardfocused (resonant) voice approach was chosen for this study.This approach was chosen based on the concept that bothpatients with hyperfunctional and hypofunctional voice disor-ders benefit from forward focused voice therapy. Althoughforward focused voice is predominately touted for its position-ing of the vocal folds during phonation to minimize forcefulcontact and presumably allow tissue healing, it is also usefulfor persons with hypofunctional voice disorders for the samereason.11 Because forward focused voice does not require thesame level of vocal fold contact as nonforward focused phona-

    tion to be produced, it works with the anatomy of patients withThe second step in formulating the mastery experiencewas toidentify the appropriatemeasure of success that would be readilyadopted by the patient. We chose acoustic analysis for this pur-pose because it is both a biofeedback and a measurement tech-nique that provides a clear means for the patients tounderstand that they are improving. Because of the objective na-ture, visual display, and ability to replay the phonation, acousticanalysis seemed to provide the most opportunity for relaying in-formation on the change from the prestimulability to poststimul-ability trial. Anecdotally, information from acoustic analysis,both the visual image of the red and green diagram from multi-dimensional voice program (MDVP) and the numerical results,seems to be a measure that naturally resonates with patients.

    PURPOSEThe purpose of this study was to evaluate whether objectiveacoustic analysis paired with a short stimulability trial of for-ward focused voice provides positive feedback to most patients.If acoustic analysis during a forward focused stimulability trialprovides early, quick, and positive feedback for most patients, itmay be a useful mastery experience to improve patient adher-ence to and benefit from voice therapy. The long-term planfor this line of research is to follow patients who are exposedto this mastery experience to determine if this approach doesimprove self-efficacy, treatment adherence, and behavioraltreatment outcomes.The specific research questions for the first step in this pro-

    cess were

    1. Do the acoustic analysis parameters of frequency and am-plitude perturbation, noise-to-harmonic ratio (NHR), andvoice turbulence index (VTI) differ before and after voicestimulability trials?

    2. Is the change of fundamental frequency (Fo), not thehypofunctional voice disorders to also improve their voicequality. Additionally, there is a relatively low possibility ofharming the vocal fold tissue during a supervised trial of for-ward focused therapy during the voice evaluation. As reportedby Boone and McFarlane,12 the approach is generally helpful topatients with voice disorders with the exception of those whosedisorder involves a hypernasality component. Forward focusedvoice has the advantage of providing a large amount of innatefeedback to the patient. Forward focused voice exercises pro-vide the feeling of vibration or sensation on the lips or in themouth, a decrease in laryngeal tension, and an immediatechange in voice quality. Forward focused voice exercises areubiquitous in the voice clinic and have been part of many voicetherapy approaches advocated by the leaders in the field.1315

    Other voice therapy approaches that may provide similarlyfast changes in vocal quality may also be appropriate for thispurpose depending on the individual patient characteristics.A noninclusive list of such therapies that may be explored forthis purpose are the Lessac-Madsen resonant voice therapy,vocal function exercises, the accent method, flow phonation,change in voice quality because of the treatment,

  • [RAP]), shimmer (Shim), NHR, and VTI using MDVP.


    tic analysis measures were achieved. The MDVP normativethresholds were used to group patients into categories: withinnormal limits or outside normal limits for analysis using theMcNemars test for matched pairs.


    Do the acoustic analysis parameters of frequencyand amplitude perturbation, NHR, and VTI differbefore and after a voice stimulability trial?Overall, the RAP and Shim measures were improved during thestimulability trial from the initial recordings (Figures 14). Theprestimulability habitual pitch average RAP measure of 1.38%was reduced to an average poststimulability measure of 0.68%.The average prestimulability habitual pitch Shim measure of3.9% was reduced to an average of 2.7% when measured post-stimulability trial. For NHR, the prestimulability habitual pitch

    Heather Shaw Bonilha and Amy Elizabeth Dawson Mastery Experience 665.e3alysisNemars test for matched pairs and paired t test were used toresponsible for the changes in acoustic analysis measuresbetween pre- and poststimulability trial recordings?


    ParticipantsTwenty-four consecutive patients referred for voice evaluationat the Medical College of Georgia (MCG) participated in thisstudy. The procedures used in this study were those commonlyused for the evaluation of patients with voice disorders. Thedata for this study were assessed in a retrospective chart reviewapproved by the institutional review board of the MCG. The pa-tients included in this study were not restricted by any criteria.The patients referred had diagnoses ranging from prenodules topresurgery for cysts to unilateral paralysis.

    Data collectionParticipants were recorded sustaining /a/ at habitual pitch andvolume, high pitch and habitual volume, and low pitch and ha-bitual volume with a headset microphone. Subjects were notguided in the selection of pitch for any of the tasks. Patientsthen underwent a stimulability trial that ranged from 3 to 5 min-utes. The trial duration depended on the patients ease of learn-ing the task. The stimulability trial began by asking the patientsto take a breath and hum; they were then asked to repeat this andfeel for any vibration or sensation on their lips or the front oftheir mouth. Patients who were instructed to specifically attendto their oral cavity were not advised to attend to their nasal cav-ity as we wished to simplify the task for the patient and haveonly one area of focus for detecting vibration. Once the patientachieved this, they were asked to take a breath, sustain a humuntil they felt vibration, and stop. Next, the patient was askedto take a breath, sustain a hum until they felt phonation, andthen sustain /i/ while feeling for vibration on their closed teeth.Once the patients were able to sustain the /mi/, they were askedto add a /a/ at the end. When the patients were able to do this,they sustained the resonant /a/ for 23 seconds while it was re-corded. That is, the patients said /mia/ and sustained the lastphoneme for acoustic analysis.The MDVP Model 5105 (KayPENTAX, Montvale, NJ) cou-

    pled with a condenser head-mount microphone (AKG C420,Acoustics Harman Pro GmbH,Munich, Germany) held at a dis-tance of 4 cm and an angle of 45 from the participants mouthwas used to record the acoustic signal. Before acoustic record-ings, a trial of phonation was captured, and the gain was ad-justed to prevent peak clipping and maximize the use of thedynamic range. Recordings judged as unrepresentative of theparticipants true voice quality or those not following protocolwere excluded. Recordings were verified for Type I status as tobe applicable for acoustic analysis.16 The acoustic signalswere analyzed for Fo, jitter (relative average perturbationess whether statistically significant differences in the acous-

    FIGURE 1. Box plot of RAP during the four tasks: pretask habitualaverage NHR measure was 0.116, and poststimulability trial,the NHR measure was 0.115. Although the average NHR didnot change, the range of NHR measures was reduced andmore closely approximated the mean. The prestimulabilityhabitual pitch average VTI measure was 0.0267, and poststi-mulability trial, the VTI measure was 0.0325. Paired t testsfor comparing pretask and posttask acoustic analysis measuresrevealed statistically significant differences at the 0.05 level forRAP (P 0.001) and Shim (P 0.002). Statistically signifi-cant differences were not found for NHR (P 0.08) or VTI(P 0.938) pre- and posttask.A review of the data based on the normative threshold used

    by MDVP was completed. The normative threshold valuesare 0.68% for RAP, 3.81% for Shim, 0.19 for NHR, and0.061 for VTI. The results were assessed for the percent of pa-tients who were outside the normative threshold for pretaskhabitual phonation. For RAP, Shim, NHR, and VTI, 72%,36%, 8%, and 0%, respectively, were outside normal limits pre-task (Figure 5). Posttask, 61%, 77%, and 100% of these phona-tions changed from being outside to inside normal limits forRAP, Shim, and NHR, respectively (Figure 6). Results demon-strated a significant change from pre- to posttrial, as indicatedpitch, pretask high pitch, pretask low pitch, and posttask habitual pitch.

  • levels poststimulability trial. Nine patients had Shim measures

    FIGURE 2. Box plot of Shim during the four tasks: pretask habitual

    Journal of Voice, Vol. 26, No. 5, 2012665.e4above threshold levels prestimulability trial, and seven of thosepatients had Shim measures below threshold levels poststimul-ability trial. The bench mark of the measure crossing the thresh-old is a stringent one, but it is also the most visually appealing(from red to green inMDVP).When less rigid criterion of a pos-itive change in one or more of the acoustic measures evaluatedis used, 96% of patients noted improvements.

    Is the change of Fo during the stimulability trialresponsible for the changes in acoustic analysismeasures between pre- and poststimulability trialrecordings?The average Fo for the four tasks for habitual, high, low, andby the objective measure transitioning from being outside towithin normal limits, in 75% of patients (P 0.00003,McNemars test for matched pairs). Eighteen patients hadRAP measures above threshold levels prestimulability trial,and 11 of those patients had RAP measures below threshold

    pitch, pretask high pitch, pretask low pitch, and posttask habitual pitch.unloaded tasks was 193, 317, 157, and 218 Hz, respectively

    FIGURE 3. Box plot of NHR during the four tasks: pretask habitualpitch, pretask high pitch, pretask low pitch, and posttask habitual pitch.(Figure 7). Paired t tests for comparing pretask and posttaskacoustic analysis measures revealed statistically significant dif-ferences at the 0.05 level for Fo (P 0.001). Differences in theaverage RAP measures for habitual, high, low, and unloadedtasks were 1.31%, 1.46%, 1.42%, and 0.62%, respectively. Dif-ferences in the average Shim measures for habitual, high, low,and unloaded tasks were 3.8%, 3.82%, 3.79%, and 2.5%, re-spectively. Differences in the average NHR measures for habit-ual, high, low, and unloaded tasks were 0.116, 0.116, 0.133, and0.113, respectively. Paired t tests for comparing posttask habit-ual phonation and pretask high pitch phonation revealed statis-tically significant differences for Fo (P 0.000), RAP(P 0.000), and Shim (P 0.017). NHR and VTI did not re-veal such differences at 0.942 and 0.574, respectively. Pairedt tests for comparing posttask habitual phonation and pretasklow pitch phonation revealed statistically significant differ-ences at the 0.05 level for Fo (P 0.000), RAP (P 0.000),Shim (P 0.007), and NHR (P 0.012). VTI did not revealsuch differences (P 0.51).FIGURE 4. Box plot of VTI during the four tasks: pretask habitualpitch, pretask high pitch, pretask low pitch, and posttask habitual pitch.DISCUSSION

    Do the acoustic analysis parameters of frequencyand amplitude perturbation, NHR, and VTI differbefore and after voice stimulability trials?The recordingsmade poststimulability trial had improved acous-tic analysis measures compared with the recordings made pres-timulability trial. In most cases, this difference was significantenough to move the analysis measure from above normal limits(red) to within normal limits (green). This change is importantfor a mastery experience for three reasons: (1) acoustic analysisallows the patients to be able to immediately see a difference intheir measures during the voice evaluation, (2) acoustic analysisrecordings can be replayed to give the patients the chance tolisten to and evaluate their voice, and (3) acoustic analysis allowsthe clinician to test treatment approaches in an easily document-able manner. The quick positive feedback for patients is impor-tant for a mastery experience to increase patients self-efficacy,establish the credibility of the treatment, and motivate the

  • Heather Shaw Bonilha and Amy Elizabeth Dawson Mastery Experience 665.e5patient to adhere to an at-home therapy regimen. The masteryexperience has been charged as the best way to improve self-efficacy, which, in turn, has shown to be a strong positive predic-tor of behavioral change.

    Is the change of Fo during the stimulability trialresponsible for the changes in acoustic analysismeasures between pre- and poststimulability trialrecordings?The recordings made poststimulability trial have improvedacoustic analysis measures compared with the habitual pitch.Given this significant finding, it was necessary to evaluatethat the cause of the change was because of the forward focusedvoice quality and not because of the change in pitch in the pre-and posthabitual phonations. To achieve this, we compared theacoustic parameters achieved during the posttrial habitual pitchwith those from the high pitch and low pitch recordings madeprestimulability trials. We found an advantage to the forwardfocused technique beyond high or low pitch change alone.Although the Fo on averagewas higher for the poststimulabilitytrial recordings than the habitual prestimulability trial record-ings, it does not appear that the positive changes in the acousticanalysis measures of perturbation are a result of a change inpitch. This interpretation of the findings is most strongly

    FIGURE 5. Example of a screen print from a prestimulability acoustic anacoustic parameters.supported by a comparison of acoustic analysis measuresfrom the prestimulability trial high pitch recordings and thepoststimulability habitual phonations. This point of evaluationis most important because it has been noted that many patientsincrease their Fo when performing forward focused voice exer-cises. The finding of higher perturbation in the high pitch com-pared with the posttrial recordings indicates that the task benefitwas not just from the increased Fo. Furthermore, many patientsnoted a decreased pitch as part of their voice disorder, so an in-crease in the Fo in the poststimulability acoustic analysis re-cordings may be another indication of improved voice quality.

    LimitationsOne shortcoming of the study was the absence of a direct con-trol of intensity. The intensity of the microphone was set foreach patient in the pretask habitual pitch condition and wasnot changed for the other pretask or the posttask recordings.Therefore, although exact measures of intensity were not taken,a relative measure of similarity between the two productionsoccurred. That is, a louder phonation, which would have causedpeak clipping, did not occur. Similarly, a softer phonation,which would have indicated a low signal and would not be idealfor acoustic analysis measures, did not occur.

    alysis demonstrating scores outside normal limits (red) on a number of

  • Journal of Voice, Vol. 26, No. 5, 2012665.e6There was no follow-through on patient adherence to therapyor patient outcomewith voice therapy. This study was limited toa proof of concept analysis to examine whether a stimulabil-ity trial (forward focused voice) measured by acoustic analysis

    FIGURE 6. Example of a screen print from a poststimulability acoustic anoutside normal limits (red) and now within normal limits (green).

    FIGURE 7. Box plot of Fo during the four tasks: pretask habitualpitch, pretask high pitch, pretask low pitch, and posttask habitual pitch.(objective measures and visual biofeedback) was successful atproviding positive feedback and a mastery experience for mostpatients. There is a need to follow-up this study with research toevaluate whether having this positivemastery experience has animpact on self-efficacy, treatment adherence, and treatmentoutcomes.Several factors may contribute to a patient mastery experi-

    ence and improved self-efficacy. Some factors come from theuse of the forward focused voice task, which provides manyfeedback mechanisms: oral vibratory sensation, reduced laryn-geal tension, and change in voice quality. Other factors are fromthe multiple benefits of using acoustic analysis in that it affordsthe ability to replay the phonation, provides objectivemeasures,and visual biofeedback. An attempt to specifically report if anyof these possible mechanisms alone would provide a masteryexperience is not been possible, given this research design.

    CONCLUSIONSThe results of this study demonstrate that a stimulability trial offorward focused voice significantly improves acoustic analysismeasures of perturbation in most patients. Given this, it is likelythat pairing acoustic analysis with forward focused voice would

    alysis demonstrating a change from Figure 5 with parameters that were

  • provide a mastery experience for patients during their voiceevaluation. Because a mastery experience is the strongest wayto increase self-efficacy, it is possible that it would encouragepatients to be diligent in their therapy exercises at home andhelp establish confidence in the voice therapy process. Furtherstudy is needed to test the usefulness of stimulability trials withother treatment techniques. This line of research would alsobenefit from a study of long-term follow-up data on the differ-ence in the outcomes (voice, exercise consistency, therapyfollow-through) of patients who receive and do not receivestimulability trials with acoustic analysis used for visual feed-back to create a mastery experience.

    AcknowledgmentsThe authors express their appreciation to Dr Gregory Postmafor his contribution to the data collection and clinical assess-ment of the participants. They also express their appreciationto Dr Paul Nietert for his statistical analysis consultation and re-view of the manuscript. This research was supported in part byKL2 UL1 RR029880 National Institutes of Health/NationalCenter for Research Resources.

    REFERENCES1. Portone C, JohnsMM 3rd, Hapner ER. A review of patient adherence to the

    recommendation for voice therapy. J Voice. 2008;22:192196.

    2. Hapner E, Portone-Maira C, Johns MM 3rd. A study of voice therapy drop-

    out. J Voice. 2009;23:337340.

    3. Prochaska JO, DiClemente CC. The transtheoretical approach. In:

    Norcross JC, Goldfried MR, eds. Handbook of Psychotherapy Integration.

    2nd ed. New York, NY: Oxford University Press, ISBN 0195165799; 2005:


    4. Callaghan P, Khalil E, Morres I. A prospective evaluation of the Transtheor-

    etical Model of Change applied to exercise in young people. Int J Nurs Stud.


    5. Armitage CJ. Is there utility in the transtheoretical model? Br J Health Psy-

    chol. 2009;14:195210.

    6. van Leer E, Hapner ER, Connor NP. Transtheoretical model of health be-

    havior change applied to voice therapy. J Voice. 2008;22:688698.

    7. Prochaska JO. Decisionmaking in the transtheoretical model of behavior of

    change. Med Decis Making. 2008;28:845849.

    8. Elder JP, Guadalupe AX, Harris S. Theories and intervention approaches to

    health-behavior change in primary care. Am J Prev Med. 1999;17:275284.

    9. Bandura A. Self-efficacy: toward a unifying theory of behavioral change.

    Psychol Rev. 1977;84:191215.

    10. Bandura A, Adams NE, Beyer J. Cognitive processes mediating behavioral

    change. J Pers Soc Psychol. 1977;35:125139.

    11. Verdolini K, Druker DG, Palmer PM, Samawi H. Laryngeal adduction in

    resonant voice. J Voice. 1998;12:315327.

    12. Boone DR, McFarlane SC. The Voice and Voice Therapy. 5th ed. Engle-

    wood Cliffs, NJ: Prentice Hall; 1994.

    13. Abbott KV. Lessac-Madsen Resonant Voice Therapy: Clinician Manual.

    San Diego, CA: Plural Publishing Inc.; 2008.

    14. Stemple J, Glaze L, Klaben B. Clinical Voice Pathology: Theory and Man-

    agement. 3rd ed. Clifton Park, NJ: Delmar Learning; 2000.

    15. Boone DR, McFarlane SC, Von Berg SL. The Voice and Voice Therapy.

    7th ed. Boston, MA: Pearson Education Inc.; 2005.

    16. Titze IR.Workshop on Acoustic Voice Analysis: Summary Statement. Iowa

    City, IA: National Center for Voice and Speech; 1995.

    Heather Shaw Bonilha and Amy Elizabeth Dawson Mastery Experience 665.e7

    Creating a Mastery Experience During the Voice EvaluationIntroductionPurposeMethodParticipantsData collectionAnalysis

    ResultsDo the acoustic analysis parameters of frequency and amplitude perturbation, NHR, and VTI differ before and after a voice s ...Is the change of Fo during the stimulability trial responsible for the changes in acoustic analysis measures between pre- a ...

    DiscussionDo the acoustic analysis parameters of frequency and amplitude perturbation, NHR, and VTI differ before and after voice sti ...Is the change of Fo during the stimulability trial responsible for the changes in acoustic analysis measures between pre- a ...Limitations