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3 Cards in this Set
- Front
- Back
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Intrinsic Laryngeal Muscles
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•During production of voiced and voiceless consonants
•PCA – AB •Participation of the posterior cricoarytenoid for voiced consonants and suppression •EMG studies of the intrinsic laryngeal muscles during speech are still in their preliminary stages •Three functional groups- abductor, adductor and tensor •PCA activity in phonation- EMG activity of PCA decreased during sustained phonation- AB •Increasing activity of the PCA during phonation in some clinical cases. But data is concerned more with vowel phonation when no F0 is specified. •Primary purpose of study was to systematically investigate actions of intrinsic laryngeal muscles in speech with special reference to the articulation of segmental features of American English. •Attempt was made to investigate the temporal aspects of consonant production by studying the timing relationships between laryngeal and supralaryngeal muscle activity patterns for one subject only /p/ vs./b/ and /s/ vs./z/ contrasts were examined while pairs of three stops and four fricatives were examined for the other subjects. •PCA activity for /p/ voiceless, but suppressed for /b/ voiced as well as vowel production. •For both consonants /p/ and /b/ the INT shows a reciprocal pattern to PCA •VOC- two peaks that correspond to vowel production, with a higher peak for stressed vowels •PCA – participate with voiced and voiceless distinctions(increased PCA activity for voiceless consonants) •PCA and INT reciprocal •Participates with voiceless consonants •CT activity for stressed vowels but not voice/voiceless distinction- (pitch) |
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Myoelastic Aerodynamic Theory
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Aerodynamic- VF R activated by the air stream from the lungs rather than the nerve impulses
Myoelastic- The ways in which the muscles control elasticity and tension so that they can be set into vibration and so that changes can be made in their frequency of vibration. The # of times the VFs are blown apart and come back together per second in their F0 of vibration. The important point of myoelastic theory is that the determinants of the vibratory cycle R aerodynamic. Air pressure for the lungs blows the VFs apart and opens the glottis during each vibration. The folds come together again during ach vibration because of their elasticity and the sudden drop between the folds (Bernoulli principal) as the air streams through the open glottis. |
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Muscle function for Inhalation and exhalation
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INHALATION
Rest- Diaphragm, External intercostals, Internal intercostals, possibly minimal scalene Normal speech- Diaphragm, External intercostals, Internal intercostals, scalene Effortful speech- Diaphragm, External intercostals, Internal intercostals, Scalene Maximum Effort- Diaphragm, External intercostals, Internal intercostals, Scalene, Sternocleidomastoid, Pectoralis major, Pectoralis minor, Trapezius, Serratus anterior EXHALATION Rest- minimal use of Internal intercostals, Rectus abdominis, External abdominal oblique Normal Speech- Internal intercostals, and minimal use of the Rectus abdominis, and External abdominal oblique Effortful speech- Internal intercostals, Transverse thoracic, Rectus abdominis, External abdominal oblique Maximum Effort- Internal intercostals, Transverse thoracic, Rectus abdominis, External abdominal oblique |
