Objective Measures of Voice and ISBAR Flashcards
What is the cut-off for ‘normal’ voice for HNR?
What is the cut-off for perceptual clarity?
20+
25+
What ‘mini-baseline’ tasks should we collect during every therapy session (and record!)
- Have a conversation (not performative - good for typical quality comparison)
- The Rainbow Passage (Fairbanks, 1960) - same words each time - look at particularly dysphonic phrases
- CAPE-V phrases
- Prolonged vowel ‘ah’ ~5sec (for HNR)
In PRAAT, which part of the sample do we analyse for HNR?
The ‘best’ bit of the MPT (when the voice is most stable & there is less ‘noise) –> if pitch isn’t stable or there is too much noise, MPT reading will be inaccurate (PRAAT can’ t analyse the data).
Mean of SD of F0 in women for prolonged vowel.
SD 1-3
*If type II voice or above note this + that results should be interpreted with caution.
Mean F0 for reading The Rainbow Passage (women aged 40-49)
- 8Hz
* culture may impact
(Baken + Orlikoff, 2000)
Conversational mean for women (40-49)
170.5Hz
Berg et al., 2016
Perceptual ‘hoarseness’ or roughness of a voice correlates to lower WHAT scores in PRAAT?
HRN (Harmonic-to-noise ratio)
also to higher shimmer and jitter
Functional tasks are part of which subjective assessment?
Vocal Function Assessment
Types of voices (for acoustic analysis)
Type 1 - Periodic
Type 2 - Some bifurcations/subharmonics
Type 3 - Chaotic, aperiodic
Type 4 - stochastic noise (oesophageal voice, post laryngectomy)
Harmonics are multiples of F0. F0 is the rate of vibration of the vocal folds. In a good, clear voice there will be more energy (darker bands) in which harmonics?
The lower ones
Which voice types can you take and objective measure of pitch (F0) from?
Types 1 and 2
What is jitter?
very small purturbations of the rate of vocal fold vibration (tiny fluctuations in the superior lamina propria that aren’t quite in the rhythm of the vibration)
What is shimmer?
Irregularity in the amplitude (degree of opening of the vocal fold due to small changes in subglottic air pressure/irregularity on vocal fold etc)
Can jitter and shimmer be analysed in a clinically relevant way?
No - values change according to volume, background noise, position of microphone…
The standard deviation of pitch on an F0 measure during MPT/prolonged vowel tells us what?
How well the patient can keep their pitch stable.
1-3 is normal SD
Which functional task to we use to analyse Mean F0?
Connected speech –> The Rainbow Passage (because there are norms reported) BUT F0 during reading is higher than just conversational speech.
Which functional task to we use to analyse Max / Min F0?
Pitch range task (ie pitch glides)
Which functional task to we use to analyse F0 SD?
Prolonged vowel
Which functional task to we use to type the signal (voice type 1, II, II or IV)?
Prologed vowel
Which functional task to we use to analyse HNR, Shimmer, Jitter?
Prolonged vowel
Which functional task to we use to analyse CPP (Cepstral Peak Prominence), LTAS (Long-Term Average Spectrogram)?
Connected speech (n/s if The Rainbow Passage or conversation?)
Which functional task to we use to analyse mean amplitude?
Connected speech (n/s if The Rainbow Passage or conversation?)
Which functional task to we use to analyse Max/Min amplitude?
Dynamic Range task (loudness task)
–> usually as people become less dysphonic, the difference between their quietest and loudest sounds increase.
What does an electroglottograph measure?
take a simultaneous audio-recording
True Vocal folds being in contact (circuit completes when true vocal folds come into contact - voltage increases)
MODAL - LONGER PERIOD OF OPEN/CLOSE AND FEWER CYCLES PER SECOND.
FALSETTO - SHORT PERIOD OF TIME WHEN VOCAL FOLDS ARE TOUCHING COMPLETELY - VOCAL FOLDS OPEN FOR LONGER.
PULSE (fry) - DOUBLE PEAK CORRESPONDS TO PERIOD OF CLOSURE. UNIQUE PATTERN.
Electroglottography
ORAL PRESSURE IS EQUIVALENT TO SUBGLOTTIC PRESSURE (EXCEPT AT VERY HIGH/LOW PRESSURE) THE AMOUNT OF PRESSURE REQUIRED TO BEGIN VOCAL FOLD VIBRATION.
- so how to test subglottic pressure?
/p/ /p/ /p/
(sound released on full lip-closure, prior to vowel)
Measures larnygeal resistence (measure of closure) - can help with diagnosis
Inducible laryngeal obstruction (ILO) [narrowing of larynx in response to triggers like exercise]. Measured by ENT how?
Air Volume Measures ie Wet Spriometer and lung volume (measures of movement of abdomen and rib cage movement during breathing - Plethysmograph. Calibrated with spirometer and airflow)
What are physiological Assessments that measure electrical signal (action potential) in muscles used for?
(done by ENT or neurologist)
Electromyography
- locate specific muscles (ie for botox injection to treat spasmodic dysphonia)
- Diagnoses muscle paresis or paralysis