Phonation Lab

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School

Arizona State University *

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Course

310

Subject

Mechanical Engineering

Date

Oct 30, 2023

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pdf

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2

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ASU online SHS 310 Lab 2 – Phona5on Watch the accompanying video link found on Canvas in Module 2. [ hGps://youtu.be/MkrvvjuRhvo ] 1. Look closely at the model of the laryngeal car5lages. Label the following, using the illustra5on below (try not to use your book or notes): Hyoid bone, thyroid car5lage, cricoid car5lage, arytenoid car5lages, corniculate car5lages, vocal folds. 2. Look at the vocal folds. They are called the thyroarytenoids, because they aGach at the vocal angle and the muscular process of the arytenoid. Imagine the muscle that originates at the muscular process of the arytenoid car5lages, and courses downward and anteriorly to the superior borders of the cricoid arch. Draw in this muscle. This is an important muscle of phona5on. What is this muscle called? Lateral cricoarytenoid . 3. Watch the video, and observe the structures made with play-doh. We have connected one end to each of the muscular processes of wthe arytenoid car5lages, and then connected the other end to the posterior cricoid lamina. What muscle would this be called? Posterior cricoarytenoid muscle. 4. Observe the downward gentle pull on the string aGached to the muscular processes of the arytenoids. What happens to the vocal folds? They adduct or come together. What happens when you the string is released? When the string is released the vocal folds abduct or move apart.
5. Stretch two rubber bands around a plas5c box as shown in the video and below. Pluck one of the rubber bands. You can see it vibrate. Note the sound that it makes. It makes kind of like a bopping sound. 6. Try pulling one rubber band 5ghter than the other as shown in the video and below. What happens to the pitch? The pitch is higher . How is the rubber band different than in #5 above (describe in terms of cross-sec5onal mass)? The rubber band that is pulled =ghter has a higher tension because it is stretched more. The difference in pitch is related to the difference in tension or =ghtness of the rubber bands, the =ghter one makes a higher frequency sound. 7. What happens with a wider rubber band? Is the pitch higher or lower? Circle one: higher / lower. a. Why? A wider rubber and has a greater cross-sec=onal mass compared to a narrower one, meaning it has more material that needs to vibrate when it makes a sound. The more mass of the rubber band makes a slower vibra=on and lower pitched sound because of the increased surface area of the winder one. 8. If the rubber bands represent the vocal folds, what do longer, thinner vocal folds sound like when they vibrate? Longer and thinner vocal folds tend to produce higher-pitched sounds when they vibrate. What do vocal folds with greater mass sound like when they vibrate? They produce lower-pitched sounds when they vibrate.
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