Measuring Vocal Function—Stroboscopyallows examiner to “slow down” vibratory movements of the vocal folds during sound productionhorizontal excursion of vocal foldscan also assess symmetry of vibration, mucosal wave characteristics, etcnoninvasive technique used to estimate vocal fold contact areaupward movement of trace represents decreasing impedance and hence, greater vocal fold contacttwo most common measures are laryngeal airflow and laryngeal airway resistanceinvolves measurement of translaryngeal airflow during vowel and estimate of subglottal pressure taken from plosive production during /ipipipipipi/ syllable traincommercially available systems allow for recording and measurement of number of parametersaverage, range, cycle‐cycle variation (jitter)intensityaverage, range, cycle‐cycle variation (shimmer)spectrumFo, intensity, temporal characteristics, spectral characteristics (e.g. spectral noise associated with harshness, hoarseness, breathiness)obvious choice where available given importance of muscle activity on laryngeal functioneg. differential paralysis from mechanical fixationmay use to determine degree and extent of paralysisLecture 25 Outline of Last Lecture I. Age and Gender DifferencesII. Voice RegisterIII. Phonatory Parametersa. Intensity (SPL)II. Laryngeal AdjustmentIII. Supralaryngeal AdjustmentIV. Frequency—Intensity RelationshipV. Measuring Vocal Functiona. Vocal Fold VisualizationVI. Vocal Fold AnomaliesOutline of Current Lecture VII. Measuring Vocal Functiona. Stroboscopyb. Electroglottographyc. Acousticsd. ElectromyographyCurrent Lecture Measuring Vocal Function- Measuring Vocal Function—Stroboscopy o allows examiner to “slow down” vibratory movements of the vocal folds during sound productiono can quantify number of aspects of vocal fold function, such as ... horizontal excursion of vocal folds glottal width open, close quotient fundamental frequencyo can also assess symmetry of vibration, mucosal wave characteristics, etc- Measuring Vocal Function—Electroglottography These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute. CSD 3112 1st Editiono noninvasive technique used to estimate vocal fold contact areao based on changes in impedance to current flow through the neck occurring as a result of vocal fold tissue contacto upward movement of trace represents decreasing impedance and hence, greater vocal fold contacto easy to useo inexpensiveo noninvasiveo may be difficult to interpret in individuals with voice disorders- Measuring Vocal Functiono two most common measures are laryngeal airflow and laryngeal airway resistanceo air flow rates may be expected to change in pathological states (hypo‐ and hyper‐functional)o laryngeal airway resistance estimates openness of the laryngeal airway during phonationo involves measurement of translaryngeal airflow during vowel and estimate of subglottal pressure taken from plosive production during /ipipipipipi/ syllable traino RL = (tracheal press. – pharyngeal press) / translaryngeal airflow- Measuring Vocal Function—Acoustics o commercially available systems allow for recording and measurement of number of parameterso fundamental frequency average, range, cycle‐cycle variation (jitter)o intensity average, range, cycle‐cycle variation (shimmer)o spectrum Fo, intensity, temporal characteristics, spectral characteristics (e.g. spectralnoise associated with harshness, hoarseness, breathiness)- Measuring Vocal Function—Electromyography o obvious choice where available given importance of muscle activity on laryngeal functiono useful for assessment of paralysis eg. differential paralysis from mechanical fixationo may use to determine degree and extent of
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