a dynamic model of partial transparency in harmonycsmit372/pdf/smith_cls53_slides.pdf · 2019. 5....
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A Dynamic Model of Partial Transparency in Harmony
Caitlin Smith
University of Southern California
Dynamic Modeling in Phonetics & PhonologyCLS 53
May 24, 2017
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Introduction
Harmony: spreading of some property (nasality, tongue root position) throughout some domain
( m ã w ã )
Transparent segments: apparently skipped by a harmony process
( m ã t ã )
Trigger
Undergoers
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Introduction
• Introduce Gestural Harmony Model (Smith 2016a, 2016b)-Harmony as gestural overlap-Transparency as gestural blending
• Provide analysis of apparent case of partial transparency in Coeur d’Alene Salish faucal harmony
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Harmony, Transparency,and Gestural Overlap
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Gestural Parameters
• Gesture: dynamically-defined, goal-based unit of representation (Browman & Goldstein 1986, 1989)
• Target articulatory state:- Constriction degree- Constriction location
• Stiffness (k): how quickly a gesture’s target articulatory state is reached
• Articulators involved• Strength (α): ability to command articulators
Tongue Tipalveolarclosure
target articulatorystate achieved
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Velumopen
target articulatory state reached,gesture self-deactivates
self-deactivating
gesture
non-self-deactivating
gesture
target articulatory state reached,gesture does not self-deactivate
Gestural (Non-)Self-Deactivation
Velumopen
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Nasal Harmony in Tuyuca
Morphemes are either oral or nasal; obstruents are transparent (Barnes & Takagi de Silzer 1976):
Full harmony Transparencya. [jãmi] ‘night’ d. [mĩpi] ‘badger’
b. [wĩno ] ‘wind’ e. [wãti] ‘demon’
c. [jo ɾe ] ‘small hen’ f. [jo so ] ‘bird’
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Nasal Harmony in Tuyuca
Velum open
Tongue Bodyuvular-pharyngeal narrow2
Tongue Bodypalatal mid4
Tongue Bodypalatal narrow1
Tongue Tipalveolar tap3
[ j1 õ2 ɾ3 ẽ4 ]
Velumaperture
Gesturalscore
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Nasal Harmony in Tuyuca
Morphemes are either oral or nasal; obstruents are transparent (Barnes & Takagi de Silzer 1976):
Full harmony Transparencya. [jãmi] ‘night’ d. [mĩpi] ‘badger’
b. [wĩno ] ‘wind’ e. [wãti] ‘demon’
c. [jo ɾe ] ‘small hen’ f. [jo so ] ‘bird’
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Transparency asGestural Antagonism• Transparency: result of competition between two
concurrently active antagonistic gestures
• Gestural antagonism: two concurrently active gestures with directly opposing goal articulatory states- Velum open vs. velum closed- Palatal tongue body constriction vs. pharyngeal tongue body
constriction
HarmonizingGesture
AntagonisticGesture
Resulting state of vocal tract for some variable:
intergesturalcompetition/blending
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Gestural Strength & Blending
• Gestural antagonism resolved by blending target articulatory states of concurrently active gestures
• Blending occurs according to Task Dynamic Model of speech production (Saltzman & Munhall 1989)
• Blended articulatory state = average of gestures’ individual target articulatory states, weighted according to strengths (α)
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Gestural Strength & Blending
• Velum opening: goal velum aperture 5 mm
• Velum closure: goal velum aperture -2 mm
Velum OpeningStrength
Velum ClosureStrength Weighted Average
0.5 0.5 5*0.5 + -2*0.5 = 1.5 mm0.9 0.1 5*0.9 + -2*0.1 = 4.3 mm0.1 0.9 5*0.1 + -2*0.9 = -1.3 mm
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Coactivation Transparencyin Nasal Harmony
Velum open (5 mm)
Tongue Bodypalatal narrow2
Tongue Bodypalatal narrow4
Lipsclosure1
Lipsclosure3
[ m1 ĩ2 p3 ĩ4 ]Velum closed
(-2 mm)
5 mm -1.3 mm 5 mm
Velumaperture
Goal VelumAperture
Gesturalscore
α=0.9 α=0.1
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Advantages of CoactivationTransparency• Correctly predicts which segments can be
transparent within nasal harmony and rounding harmony
• Avoids over-generation of predicted transparent segments (see Smith (2016) for details)
• Harmony is represented locally, resulting in gestural antagonism with transparent segments
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Predicted: Partial Transparency?
• Possible scenario: harmonizing gesture and overlapped gesture have similar strengths
• Result: partial transparency/partial undergoing of harmony
HarmonizingGesture
AntagonisticGesture
Resulting tract variable value:
intergesturalcompetition/blending
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Coeur d’Alene SalishFaucal Harmony
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Coeur d’Alene SalishFaucal HarmonyVowels surface as retracted variants before faucal (uvular and pharyngeal) consonants
Non-Faucal Context Faucal Context[tsiʃ-t] ‘it is long’ [tsɛʃ-ɑlqw] ‘he is tall’[dlim] ‘he galloped hither’ [tʃ-dlɑm-ɑlqw] ‘train’[sɛttʃ-nts] ‘he twisted it’ [nɛʔ-sɑttʃ-ɛʔqs-n] ‘crank (on a car)’[ʔɛ-niʔ-kus-ɛlstʃn] ‘hair curls back from forehead’
[ʔɑt-kɔs-qn] ‘his hair is curled’
data from Doak (1992) & Bessell (1998)
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Coeur d’Alene SalishFaucal HarmonyVowel shift in domain of faucal harmony:
• /ɛ~æ/, /i2/, /u/ all fully undergo faucal harmony
• /i1/ undergoes faucal harmony to an intermediate degree
i1 i2 u
ɛ~æ ɑ ɔ
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Coeur d’Alene SalishFaucal Harmony: Proposals• Faucal harmony is result of overlap by
harmonizing tongue body retraction gesture
• Medium-strength /i1/ partially resists (remains transparent to) effect of retraction gesture due to similar gestural blending strengths
• Weak /i2/ is fully overpowered by retraction gesture when gestural blending occurs
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Full Retraction of Weak /i/
• Weak /i2/ is fully overpowered by harmonizing retraction gesture:
• Surfaces as fully retracted [ɑ]
Tongue Bodyuvular-pharyngealnarrow
Tongue Bodypalatal narrow
Tongue BodyRetraction
Weak
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Partial Transparency of Medium-Strength /i/• Medium-strength /i1/ partially resists (remains
transparent to) effect of retraction gesture due to similar gestural blending strengths:
• Surfaces as partially retracted [ɛ]or [æ]
Tongue Bodyuvular-pharyngealnarrow
Tongue Bodypalatal narrow
Tongue BodyRetraction
Medium
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Computational Modeling in TADA
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TADA Modeling of Partial/Full Retraction• TADA (Task Dynamic Application; Nam et al.
2004): MATLAB toolkit for synthesizing articulatory trajectories and acoustic outputs from gestural scores
• Synthesized sequence with /i/ in medial syllable:
Tongue Bodypharyngeal wide1
Tongue Tipalv. clo2
Tongue Bodyuvu. clo6
Tongue Bodyuvular-pharyngeal narrow6
Tongue Bodypalatal narrow3
Tongue Bodypharyngeal wide5
Tongue Tipalv. clo4
/ ɑ1 d2 i3 d4 ɑ5 q6 /
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TADA Modeling of Partial/Full Retraction• Three conditions distinguished by relative strengths
of palatal constriction and uvular retraction gestures:
• Strong /i/ = fully transparent /i/ found in other varieties of Salish
• Medium /i/ = /i1/ in Coeur d’Alene• Weak /i/ = /i2/ in Coeur d’Alene
α for /i/ α for RetractionStrong /i/ 25 5Medium /i/ 5 5Weak /i/ 1 5
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TADA Modeling: Weak /i/[ ɑ d ɑ d ɑ q ]
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TADA Modeling: Medium /i/[ ɑ d ɛ d ɑ q ]
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TADA Modeling: Strong /i/[ ɑ d i d ɑ q ]
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Results of TADA Modeling
• /i/ à [ɑ], /i/ à [ɛ], and /i/ à [i] can all be modeled as blending between gestures of palatal constriction and uvular-pharyngeal retraction
• Gestures can be specified for strength parameter settings beyond ‘strong’ and ‘weak’-Weak /i/ corresponds to Coeur d’Alene /i2/,
undergoing full retraction-Medium /i/ corresponds to Coeur d’Alene /i1/,
exhibiting partial retraction/partial transparency- Strong /i/ corresponds to transparent /i/ in other
Interior Salish languages (e.g., Montana Salish), fully resisting retraction
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Alternative Analysis
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Alternative Analysis:Chain Shift in Coeur d’Alene• Faucal harmony produces apparent chain shift
in vowel qualityi1 à ɛà ɑ
• Synchronic chain shifts in non-derivational framework via conjunction of faithfulness constraint (Kirchner 1996)
• Coeur d’Alene Salish:-Conjoined constraint IDENT(high)&IDENT(back)-Difference in degree of uvularization in /i1/ and
/i2/ due to /i1/ being indexed to conjoined faithfulness
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Strengths of CoactivationTransparency AnalysisRepresenting faucal harmony as blending of vocalic gestures of different strengths with retraction gesture:
• Eliminates need to represent pattern of retraction in domain of faucal harmony as chain shift
• All underlying gestures and their parameter settings are preserved in output
• Produces full uvularization of /i2/, /ɛ/, and /u/ from low gestural strength and partial transparency of /i1/ from medium gestural strength
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Conclusion
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Conclusion
• Transparency in Gestural Harmony Model: result of competition between target states of dynamically-defined units of representation
• Partial transparency in Coeur d’Alene Salish faucal harmony fulfills prediction of model of transparency as competition/resistance
• Future work: examination of potential contrastive function of gestural strength