COMD #6305 The Phonatory system Chapters 4, 5

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1 COMD #6305 The Phonatory system Chapters 4, 5
Laryngeal function Theory of phonation Jitter, shimmer Vocal registers Normal vs. abnormal voice qualities Measurements of voice quality Clinical applications Instrumentation

2 The larynx- review Division between glottal, subglottal, and superglottal regions

3 Safety (preventing aspiration) Valsalva (see next slide)
Laryngeal Actions Safety (preventing aspiration) Valsalva (see next slide) Phonation

4 Valsalva mechanism After Anton Maria Valsalva (1666-1723)
Larynx closes (adducts), diaphragm raises, abdominal and chest muscles constrict Lung pressure increases: Assists with physical exertion Also clears ears

5 Fig. 6.1. Anterior View - Larynx, Trachea

6 CARTILAGES UNPAIRED CARTILAGES Thyroid Cartilage Cricoid cartilage
Epiglottis PAIRED CARTILAGES Arytenoids Corniculates Cuneiforms

7 Fig Cartilages

8 Fig. 6.4. Larynx – cutaway view

9 Thyroid cartilage – male/female differences

10 6.5. Larynx – coronal view

11 Arytenoids (lit. “ladle-like”)

12

13 Vocal Folds

14 Vocal Folds

15 Glottis Membranous glottis (vocal folds)
Cartilaginous glottis (post. 2/5 – back towards artytenoids) CG must be closed at arytenoids for voiced modal speech to begin

16 VOCAL FOLDS True vocal folds lie inferior to the false folds.
Separated by a small cleft called the ventricle. TRUE FOLDS, FALSE FOLDS and the VENTRICLE divide the subglottic, glottic and supraglottic regions.

17 TRUE VOCAL FOLDS VOCAL FOLD 1. Mucosa 2. Muscle (Thyroarytenoid)
THREE MAJOR LAYERS 1. Cover – epithelium and superficial lamina propria 2. Transition – intermediate and deep lamina propria 3. Body – vocalis muscle

18 Cover-body model (Hirano)
Cover* is least stiff Vocal ligament is more stiff Body (muscle) has greatest stiffness *cover = epithelium & superficial layer

19 Muscles of Larynx Intrinsic Extrinsic
Have origin and insertion within larynx Extrinsic Have one point of attachment to larynx and other attachment other structure

20 INTRINSIC MUSCLES OF LARYNX
Abduct (open) or adduct (close) the folds. Vocal fold length and tension. Attach at origin and insertion of different cartilages Roles in respiration, swallowing, and vocalization.

21

22 Post. Ant.

23 Cricothyroid Muscle Attached to thyroid and cricoid cartilages
Rocks thyroid forward; stretching and tensing the vocal folds Raises pitch –push on this and mechanically raise your pitch!

24 Intrinsic Muscles Main| Adductors| | Only Abductor  Raises pitch 
Together make Up vocal folds

25 The Only ABDUCTION MUSCLE
Posterior Cricoarytenoids (PCA) Open the glottis Move arytenoids away from midline

26 Abduction Adduction

27 Adductor Muscles Move arytenoids to midline Rock forward
Interarytenoids (Transverse and Oblique) Lateral Cricoarytenoids

28 Extrinsic Muscles INFRAHYOID SUPRAHYOID “One attachment to a laryngeal
and an external structure” INFRAHYOID Sternohyoid Sternothyroid Thyrohyoid Omohyoid SUPRAHYOID Stylohyoid Digastric Mylohyoid Geniohyoid

29 Infrahyoid muscles When contracted, pull the entire larynx downward
…..

30 Digastric

31 Suprahyoid muscles Pulls the entire larynx upwards in the neck. These large up and down movements occur mainly during swallowing

32 3 Branches – Vagus (CN X) Superior Laryngeal Nerve sensory
(upper = Pharyngeal Nerve) Superior Laryngeal Nerve sensory Recurrent Laryngeal Nerve motor sensory Often affected in thyroid surgery Recurrent nerve injury during thyroidectomy is the most common complication of procedure External branhes of the superior laryngeal nerve are smaller, & anatomical course is not as familiar to surgeons Widespread lack of awareness of anatomical proximity and effects of injury Damage is believed to affect high notes in singing, affecting speaking voice relatively little In illustrating this point, many textbooks and articles refer to opera singer Amelita Galli-Curci Reported to have suffered injury to external branch of the superior laryngeal nerve motor

33 Myoelastic Theory of Phonation
Orig. by Johannes Muller (1858), then Janwillem van den Berg (1958) Basically accurate (but with some RECENT revision) Myo = muscle, Elastic = recoil Pulmonic air = active force; vocal folds = passive actors Johannes Müller

34 VOCAL FOLD VIBRATION Muscle Action Subglottal pressure build-up
> Subglottal than supraglottal pressure Creates delta force Pressure drop, Bernoulli effect

35 Daniel Bernoulli The man The stamp The effect 

36 Muscosal wave Vertical phase difference (see next 2 slides)
Longitudinal phase difference (from posterior to anterior, “like a zipper”)

37 ANT POST Note: In middle snapshots we also see “longitudinal” phase difference”

38 Vocal Fold Phonation Determined by mass, length, and tension
Changes throughout utterance (question vs. statement, etc.) Males (F0: Hz) Females ( Hz) Children ( Hz)

39 Animations VF modal VF falsetto

40  The human voice is nearly periodic
F0 and Harmonics  The human voice is nearly periodic

41 Glottal Spectrum Glottal Fo with harmonics
Does not represent what is heard (due to vocal tract modulation) The Fo corresponds to the perceived pitch of the voice The harmonics contribute to the quality of the voice This is what we would see If we lowered a microphone down just over the larynx

42 Fo & Harmonic Spacing Adult Male Adult Female Child

43 Roll Off—F0 “About 40 harmonics have at least some acoustic energy in the human voice”

44 Vocal Registers Pulse (= Fry, Creaky) Modal Falsetto (cf. Table 5.5)

45 Registers – cont’d Falsetto –
Folds long and stiff, Thinner quality sound Pulse – Folds closed 90% of time biphasic or multiphasic Leaves an acoustic temporal gap

46 Electroglottography (EGG)
Best at detecting closing phase More contact between vocal folds  greater conductivity between electrodes Works better on men than women

47 EGG Readout

48 EGG – Lx wave Reflects surface area of contact of the vocal folds
“Duty cycle” of vocal fold vibration

49 Lx wave – cont’d OPENING CLOSING 3. Btwn d-e inferior
margins separate 4. At e (“knee”) – superior begins to open 5. By f, width of glottis is widest CLOSING 2. Btwn b - c, superior margins closing 1. Btwn a - b, lower margins closing

50 EGG quotients OP – open phase CP closed phase
CQ closed quotient = CP/P Closed to open ratio = CP/OP Etc.

51 period of voicing cycle
Open Quotient = time glottis is open period of voicing cycle Rreliable differences between the three voicing types: Breathy voicing  high open quotient Creaky voicing  low open quotient Modal voicing -- in between

52 Open Quotient Samples

53 Hyper- hypo- adduction
Hyper - Vocal abuse, spastic dysphonia; takes more Ps to overcome resistance of folds Hypo – inappropriate usage, VF paralysis; VFs do not offer enough resistance

54 Abnormal voice (dysphonia)
Breathiness (aspirated) Roughness (raspiness /low pitch) Hoarseness (combination)

55 (Clinical) Vocal Quality
no clear acoustic correlates However, clinical terms suggest distinct categories Common Terms Breathy Tense/strained Rough Hoarse

56 Tools for acoustic analysis Praat, TF32, Wavesurfer Etc.

57 Jitter, Shimmer - Sample computing in TF32 program


58 Period/frequency & amplitude variability
A. Jitter -: variability in the period of each successive cycle of vibration (A) B. Shimmer: - variability in the amplitude of each successive cycle of vibration (B) A B

59 Jitter and Shimmer Sources Measuring
Small structural asymmetries of vocal folds “material” on the vocal folds (e.g. mucus) Biomechanical events, such as raising/lowering the larynx in the neck Small variations in tracheal pressures “Bodily” events – system noise Measuring Variability in measurement approaches …and how measures are reported Jitter Typically reported as % or msec Normal ~ % Shimmer Can be % or dB Norms not well established

60 Harmonic to Noise Ratio (HNR)
Noise is introduced into the vocal signal via irregular or asymmetric adduction of the vocal folds. Too much noise is perceived as hoarseness ( = lower HNR) Laryngeal pathology may lead to poor adduction of the vocal folds and, therefore, increase the amount of random noise in the vocal note.

61 Tense/Pressed/Effortful/Strained Voice
Sounds “effortful” Physiologic Longer closed phase Reduced airflow Potential Acoustics Change in harmonic (periodic) energy Flatter harmonic roll off

62

63 Roughness Perceptual Description Physiologic Factors
Perceived cycle-to-cycle variability in voice Physiologic Factors Vocal folds vibrate, but in an irregular way Potential Acoustic Consequences Cycle-to-cycle variations F0 and amplitude Elevated jitter Elevated shimmer

64 Harmonics (signal)-to-noise-ratio (SNR/HNR)
Index of BREATHINESS  HNR Relatively more signal Indicative of normality  HNR Relatively more noise (thus, disorder) Normative values depend on method of calculation “normal” HNR ~ 15

65 What are norms? Good source: Baken & Orlikoff (2000)

66 Suggested Norms for Praat
jitter: <= % shimmer: <= % HNR: < 20 adult males adult females mean pitch: 128 Hz 225 Hz minimum pitch: 85 Hz 155 Hz maximum pitch: 196 Hz 334 Hz

67 HABITUAL PITCH (SPEAKING F0)
Depends on sex and age Affected by type of communication type, emotional state, background noise, reading aloud, talking on telephone, any intoxication (alcohol) children women men Mean SF0 (Hz) 265 225 128 Frequency range (Hz) 85-196 Table 1. Average Speaking Fundamental Frequencies [Source: (Williamson, 2006, p. 177)]

68 Frequency variability
Table 5.7 (pg. 182) Highest for infants, generally decrease with age Men lower than women

69 Voice range profile Fig. 5.17 (pg. 185)
Max phon range (x-axis, F0) X dynamic range (y-axis, dB SPL) “dip” = change from modal to falsetto

70 CLINICAL APPLICATIONS CHAP 5
Instrumentation: EGG, register, quotients Pathology, injury, special surgeries Botox injections for SD

71 Laryngeal aging Presbylaryngis starts by 3rd or 4th decade
Can lead to presbyphonia (breathiness and hoarseness) Increased F0 in males, decreased in females See table 6.5 (pg. 206) for more detail

72 Neurological disorders
ALS PD Unilateral VF paresis/paralysis SD Nodules/MTD/or GERD

73 ALS Degenerative disease of upper & lower motor neurons
66% intelligibility “say kite again” Degenerative disease of upper & lower motor neurons Changes in laryngeal musculature or difficulties eliminating mucous secretions(?) Jitter and shimmer tend to be greater Perhaps diagnostic of perceptually subclinical cases Idiopathic degenerative disease of upper and lower motor neurons Inevitably fatal (less than 3 years from onset) 2/100,000 with median age of onset mid-fifties most common in men Symptoms: Classic form shows both upper and lower motor neuron loss, however can be more prominent with UMN or LMN in individual patients Changes in jitter and shimmer tend to be greater BEFORE PERCEPTUALLY NOTICEABLE Meaning values could add to early diagnosis of type Increased jitter resulting from changes in laryngeal muscularure Or due to difficulty clearing mucous secretions with secretions increasing jitter (accumulating on vocal folds)

74 Parkinson’s Disease Dopamine deficiency (excessive muscle contraction)
Voice symptoms visible Hoarseness Reduced loudness (lower intensity) Limited pitch range Underlying deficiency of dopamine Often voice difficulties one of most visible symptoms hoarseness, decreased loudness, limited pitch range higher fund freq, higher jitter, lower intensity, decreased range, decreased dynamic range Excessive muscle contractions Acta Neruol Scand, 2008 Jan; 117(1): 26-34 ** jitter, shimmer, and mean F0 values similar for groups of PD and controls ** Higher values of fundamental frequency for males Male, Healthy Age-matched, PD

75 VF paralysis http://www.youtube.com/watch?v=pcTPOmNStPI
This 15 min. video shows a range of cases

76 VF paresis Paresis http://www.youtube.com/watch?v=gouMMiH6HI0
A partially immobile vocal fold. Similar to a paralysis, except there has been some neurologic recovery. Note the limited motion of the right arytenoid (left side of the screen) compared with the left (right side of the screen), and the asymmetry of the mucosal wave. This has been referred to as "chasing asymmetry.“

77 Spasmodic Dysphonia (SD)
VF paralysis yields inability to initiate or maintain phonation; strangled voice quality Adductor and Abductor varieties (and subtypes) BOTOX injections are a new avenue of treatment (see video) SD speech samples can be browsed here: Spasms of vocal folds Laryngospasms: folds adduct tightly, difficult to set into vibration Strained vocal quality SD clips Botox treatment in adductor spasmodic dysphonia Injected into affected muscle Toxim temporarily weakens or even paralyzes the muscle (usually thyroarytenoid) Voice often breathy & weak after injection b/c folds unable to close with much medial compression Injected every 3-6 months

78 Botox injection video

79 MTD: Muscle Tension Dysphonia
Compensatory or “squeeze” to make up for e.g. infection or obstruction in larynx Tx often consists of relaxation or anaesthesia

80 Vocal Fold Nodules Typically appear on the anterior 1/3 of the vocal fold, where contact is most forceful Found primarily in women and preadolescent boys A mass of tissue that grows on the vocal folds. Typically appears on the anterior one-third of the vocal fold, where contact is most forceful. Reduces or obstructs the ability of the vocal folds to create the rapid changes in subglottic air pressure Found primarily in women and preadolescent boys

81 Vocal Fold Polyps Mass usually found at the midpoint the vocal cord.
Result of heavy trauma (“screamer’s nodule”) Treatment: rest, steroids, or surgery Mass usually found at the midpoint the vocal cord. Result of vocal trauma the physical stresses on the vocal fold which occur with heavy voice use or voice use under adverse circumstances.

82 Contact Granuloma Result of injury Heaped up tissue near arytenoids
Pinkish-white Contact granulomas or contact ulcers are formed as a result of injury to the delicate tissues of the larynx. In response to this trauma, the mucosa of the vocal folds either ulcerates, forming a contact ulcer, or produces heaped-up accumulation of tissue, a contact granuloma. These lesions usually appear as a build-up of pinkish-white tissue near the arytenoid cartilages at the rear of the larynx. Contact ulcers in response to trauma. Mucosa of VF ulcerates or heaps up tissue called granuloma. Pinkish—white tissue near the arytenoid cartilage. Contact granulomas occur almost exclusively in males over the age of 20. They are common in professional voice users such as lawyers, ministers, business executives, and physicians. Symptoms: The primary symptom of a contact granuloma is the sensation of a foreign body in the throat. Constant and vigorous throat-clearing is often present and, less often, hoarseness or a husky-sounding voice. Pain, usually described as sharp and stabbing, may also be present and may radiate toward the ear. Causes: Contact granulomas are commonly caused and maintained by a combination of laryngopharyngeal reflux, voice misuse, and excessive throat-clearing or coughing. These activities cause the vocal folds to "slap" together forcefully, traumatizing the mucosa. Granulomas can also be caused by direct trauma to the vocal folds, for instance as a result of intubation.

83 Granuloma Video 1: Left vocal process granuloma, which responded well to antireflux therapy and speech therapy. Video

84 GERD Gastroesophageal Reflux Disease
Extraordinary degree of edema following 80 episodes of LPR (laryngopharyngeal reflux) Gastroesophageal reflux with laryngopharyngeal reflux plays role in voice disorders PART 1 Oral cavity, pharynx and esophagusGI Motility online (2006) doi: /gimo46
Published 16 May 2006Laryngeal and pharyngeal complications of gastroesophageal reflux disease Backflow of stomach contents into esopagus, can reach trachea & larynx When reflux disease involves the larynx or pharynx, it is referred to as laryngopharyngeal reflux (LPR) rather than gastroesophageal reflux. Related – yet different disease states with different risk factors. LPR frequently present with laryngeal symptoms such as hoarseness, globus sensation, throat clearing, sensation of postnasal drip, difficulty swallowing, chronic cough, & laryngospasm. Serious complications include obstructive pathology (laryngeal granulomas, subglottic/glottic stenoisis, laryngspasm, even laryngeal carcinoma. Treatment may require surgical management, put perioperative reflux therapy first option. Regardless of the clinical severity, all patients are counseled on dietary (low fat diet, etc.) and lifestyle modifications (avoidance of carbonated beverages, alcohol, tobacco, etc). Study of effect of voice therapy on GERD Participants either voice therapy and omepraxole or omepraxole alone Evaluated jitter, shimmer, harmonics-to-noise ratio – hoarseness & breathiness perceptually rated

85 Laryngeal Trauma http://www.youtube.com/watch?v=DZFAJgB3d-Y (Video)
Right vocal fold detachment from the vocal process of the arytenoid cartilage. It appears shortened, rounded, and sited at higher level than the left on phonation. There is accompanying stridor. Results

86 Stuttering Jitter/shimmer may help identify children at risk(?)
We will cover stuttering in our speech perception/production unit.  A teaser: Choral speech Stuttering: Simultaneous contraction of abductor and adductor muscles may yield delayed phonation and a stuttering “block”

87 Lie Detection – via voice?
Deceptive stress Detected above chance with F0 changes, not jitter Many problems with this concept Investigation and Evaluation of Voice Stress Analysis Technology All of these findings suggest that when a speaker is under stress, their voice characteristics change. Changes in pitch, glottal source factors, duration, intensity, and spectral structure from the vocal tract are all influenced in different ways by the presence of speaker stress. It is clearly unlikely that a single measure could be universally successful in assessing stress (such as that which might be experienced during the act of deception). The level and degree to which this change in muscle control imparts less/more fluctuations in the speech signal caiinot be conclusively determined, since even if these tremors exist, their influence will most certainly be speaker dependent. Sheffield research project Lie detection is commonly called 'Voice Stress Analysis' (VSA), and thereare instruments and products available that purport to perform such afunction. Most claim to function by detecting a change in so called'micro-tremors' in the voice - however, the lack of any clear science meansthat there appears to be considerable confusion as to whether the jitterincreases or decreases in lying! supervised an MSc project on the detection of 'deceptive stress’ using a corpus of material we recorded ourselves. The key to obtaining'real' lying is that there should be 'perceived jeopardy'. So, my student designed a knockout card naming game in which winning is only possible bylying from time to time – a monetary prize for the eventual winner provided the incentive to win. The student found that the lies could be detected above chance using average pitch but not using pitch jitter.

88 Laryngeal Cancer Most common type of laryngeal cancer is squamous cell carcinoma Prominent symptom: hoarseness – changes in vibration Radiation, chemotherapy, surgery are treatment options Jitter can in some cases document chemotherapy effectiveness Most common type of laryngeal cancer is squamous cell carcinoma thickening of the epithelia surgace possible cauliflower appearance if on folds later stages can impair VF movement supra or subglottic tumors possible Chemotherapy Radiation – primary treatment modality often used in combination with surgery and/or chemo Laryngectomy (1997) Study by Orlikoff found change in jitter across chemotherapy cycles in men with advanced squamous cell carcinoma of 1 or both VF Study reduction injitter across chemotherapy cycles Fell from 4.34% before first chemo to 1.52% before last chemo Patients who didn’t respond to chemo & RT did not have drop in jitter

89 Laryngeal Cancer Chronic laryngitis in pt following radiation therapy for glottic carcinoma  A nonsmoker with severe documented LPR and squamous cell carcinoma on both true vocal folds Chronic Laryngitis in patient following radiation therapy for glottic carcinoma Figure 10: A nonsmoker with severe pH probe documented LPR and squamous cell carcinoma on both true vocal folds. Risk factors: smoking, synergistic effects between smoking & alcohol intake, “typical” person diagnosed with laryngeal cancer: 60 year old man, heavy smoker, with moderate-heavy alcohol intake Laryngeal cancer less than 1% of all cancers Common symptom of laryngeal cancer is hoarseness Normal tissue that grows uncontrollably. Begins at the surface of the larynx, in the cells of the mucosa Appear white or red and grow anywhere along the VF

90 Scar tissue (post op) Affects Aerodynamics Acoustics
Vibratory patterns Vibration amplitude, area, & musosal wave compromised by VF scar Increased in phonation threshold pressure (minimum pressure to initiate phonation)

91 In-dwelling voice prosthesis after laryngeal cancer (TEP)
Insertion video (Spanish) HME = heat/moisture exchange

92 Esophageal, Transeophageal Voice
TEP Electro larynx

93 FUTURE: SSI Silent speech interface
Jun Wang, Ph.D. (UTD) Subject silently articulates System displays text on screen Synthesizer ‘speaks’ in female voice

94 Transgender issues Counseling – speaking styles Surgery? Laryngoplasty
(audio samples/ before-after)