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Articles 421 - 450 of 461

Full-Text Articles in Communication Sciences and Disorders

Effectiveness Of Story Enactments Versus Art Projects In Facilitating Preschool Children's Story Comprehension, Jennifer Ann Johnson Nov 2005

Effectiveness Of Story Enactments Versus Art Projects In Facilitating Preschool Children's Story Comprehension, Jennifer Ann Johnson

Theses and Dissertations

The purpose of this study was twofold: (a) to compare preschool children's comprehension of a story after either enacting the story or participating in an art project, and (b) to qualitatively describe the children's interactions during the more interactive story enactment instruction. Twenty children from two Head Start classrooms were told the stories as a class, and then participated in either an art project (AP) or story enactment (SE) in small groups. The children in each classroom each heard three stories followed by the AP condition, and three followed by the SE condition. The children's comprehension of the story was …

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Acoustic And Spectral Characteristics Of Young Children’S Fricative Productions: A Developmental Perspective, Shawn L. Nissen, Robert Allen Fox Oct 2005

Acoustic And Spectral Characteristics Of Young Children’S Fricative Productions: A Developmental Perspective, Shawn L. Nissen, Robert Allen Fox

Faculty Publications

Scientists have made great strides toward understanding the mechanisms of speech production and perception. However, the complex relationships between the acoustic structures of speech and the resulting psychological percepts have yet to be fully and adequately explained, especially in speech produced by younger children. Thus, this study examined the acoustic structure of voiceless fricatives /f, s, b/ produced by adults and typically developing children from 3 to 6 years of age in terms of multiple acoustic parameters durations, normalized amplitude, spectral slope, and spectral moments. It was found that the acoustic parameters of spectral slope and variance commonly excluded from …

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Acoustic And Spectral Characteristics Of Young Children's Fricative Productions: A Developmental Perspective, Shawn L. Nissen, Robert Allen Fox Oct 2005

Acoustic And Spectral Characteristics Of Young Children's Fricative Productions: A Developmental Perspective, Shawn L. Nissen, Robert Allen Fox

Faculty Publications

Scientists have made great strides toward understanding the mechanisms of speech production and perception. However, the complex relationships between the acoustic structures of speech and the resulting psychological percepts have yet to be fully and adequately explained, especially in speech produced by younger children. Thus, this study examined the acoustic structure of voiceless fricatives (/f, θ, s, ʃ/) produced by adults and typically developing children from 3 to 6 years of age in terms of multiple acoustic parameters (durations, normalized amplitude, spectral slope, and spectral moments). It was found the acoustic parameters of spectral slope and variance (commonly excluded from …

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The Effect Of A Lingual Magnet On Fricative Production: An Acoustic Evaluation Of Placement And Adaptation, Andrea Lynn Weaver Aug 2005

The Effect Of A Lingual Magnet On Fricative Production: An Acoustic Evaluation Of Placement And Adaptation, Andrea Lynn Weaver

Theses and Dissertations

Much of speech kinematics research is conducted by attaching a device to the articulators. However very little research has been conducted to determine what influence these devices may have on the perceptual and acoustic characteristics of speech. This study examined the effect of placing a small magnet on the tongue of ten normal adult speakers while reading a sentence containing /s/ and "sh" in initial, medial and final position. Two different placements of 10 and 15 mm from the tip of the tongue were analyzed. Data were taken before magnet placement, immediately after magnet placement, after 5 minutes of conversation, …

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How Individuals With Parkinson's Disease Modify Their Speech In A Repetition For Clarification, Lynn Marie Watkins Aug 2005

How Individuals With Parkinson's Disease Modify Their Speech In A Repetition For Clarification, Lynn Marie Watkins

Theses and Dissertations

The speech of individuals with Parkinson's disease (PD) is typically characterized as lacking in proper prosody because of its monopitch and monoloud quality, in addition to its reduced intensity. These qualities make it difficult for others to understand speakers with PD. The purpose of the current study was to identify what individuals with PD would do vocally, if anything at all, to improve speech production following a simulated misunderstanding of what they had just said. The study evaluated the performance of 5 individuals with PD and compared their performance to 5 age- and sex-matched controls. Specifically, measures of vocal intensity …

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Exploration Of Lip Shape Measures And Their Association With Tongue Contact Patterns, Jessica Lynn Wagner Aug 2005

Exploration Of Lip Shape Measures And Their Association With Tongue Contact Patterns, Jessica Lynn Wagner

Theses and Dissertations

A variety of tools and techniques have been developed to measure the movements of the vocal tract, specifically of the tongue and lips. In recent years, computer technology has allowed for extensive exploration of these precise movements and for the development of speech recognition systems. However, there has been relatively little work on the combination of visible facial movements and internal articulatory activity. In this study, two different technologies were used to explore the internal and external movements of speech production in eight speakers: palatometry quantified tongue contact patterns and computerized video image analysis was used to derive lip shape …

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Sex-Related Acoustic Changes In Voiceless English Fricatives, Shawn L. Nissen, Robert Allen Fox Aug 2005

Sex-Related Acoustic Changes In Voiceless English Fricatives, Shawn L. Nissen, Robert Allen Fox

Faculty Publications

This investigation is a comprehensive acoustic study of 4 voiceless fricatives (/f θ s ʃ/) in English produced by adults and pre-and postpubescent children aged 6-14 years. Vowel duration, amplitude, and several different spectral measures (including spectral tilt and spectral moments) were examined. Of specific interest was the pattern of normal development of the acoustic properties of fricatives and the nature of sex-specific patterns of fricative articulation in prepubescent children. Little evidence of amplitude or duration differences was found between speakers that was related to the sex of the speaker. However, significant sex-specific differences in fricative articulation were found in …

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The Effects Of Divided Attention On Speech Motor, Verbal Fluency And Manual Motor Task Performance, Erin Hamblin Jul 2005

The Effects Of Divided Attention On Speech Motor, Verbal Fluency And Manual Motor Task Performance, Erin Hamblin

Theses and Dissertations

Research in dual task performance varies widely in its methodology and results. The present study employed three different types of activity to provide insights into the interference that occurs in dual task performance. Twenty young adults completed a speech task (repeating a sentence), a verbal fluency task (listing words beginning with the same letter), and right- and left-handed motor tasks (placing pegs and washers in a peg board) in isolation and in concurrent conditions. Speech kinematic data revealed that during concurrent performance of manual tasks, lip displacement and peak velocity decreased, while sound pressure level and spatiotemporal variability increased. The …

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Auditory And Visual Correlates Of The Processing Of Gapping Structures In Adults, Tara Hansen Jun 2005

Auditory And Visual Correlates Of The Processing Of Gapping Structures In Adults, Tara Hansen

Theses and Dissertations

The purpose of this study was to compare event-related potential (ERP) effects of speech processing and effects in sentence reading elicited by sentences containing gapping structures, or a "missing" verb. N400 and P600 waveforms were collected in 20 adults between 18 and 30 years of age. Two experiments were conducted with each participant. In the two experiments ERP recordings were collected as sentences, some containing gapping structures, were presented to the subjects. In one experiment sentences were presented through headphones in sentences spoken at normal rate and with normal intonation. In the second experiment sentences with the same gapping structures …

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Performance Intensity Functions For Digitally Recorded Japanese Speech Audiometry Materials, Tanya Crawford Mangum May 2005

Performance Intensity Functions For Digitally Recorded Japanese Speech Audiometry Materials, Tanya Crawford Mangum

Theses and Dissertations

The purpose of this study was to develop digitally recorded speech audiometry materials in the Japanese language to evaluate Speech Reception Threshold (SRT) and speech discrimination. Trisyllabic words were used to evaluate the SRT and bisyllabic words were used for speech discrimination. Words were recorded by one native female talker and one native male talker who were judged as having standard Japanese dialects. Twenty native Japanese speakers between the ages of 20 and 32 were used as subjects to evaluate 69 trisyllabic words across 13 different intensity levels. The 25 trisyllabic words with the steepest psychometric function (%/dB) were selected …

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Recognition Of Affective Prosody By Speakers Of English As A First Or Foreign Language, Christopher Dromey, Jose Silveira, Paul Sandor Jan 2005

Recognition Of Affective Prosody By Speakers Of English As A First Or Foreign Language, Christopher Dromey, Jose Silveira, Paul Sandor

Faculty Publications

Adults who were fluent in English, and who grew up speaking English or one of 21 other languages listened to words spoken with angry or neutral intonation. We measured the accuracy with which the listeners identified the intended emotion. English mother tongue (EMT) polyglots scored higher than other mother tongue (OMT) listeners, whereas EMT monoglots did not. Women were significantly more accurate than men across the three listener groups. There was a modest inverse correlation between accuracy and age. The learning of a second language may have helped the EMT polyglots develop additional perceptual skills in decoding speech emotion in …

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Sex-Related Acoustic Changes In Voiceless English Fricatives, Shawn L. Nissen, Robert Allen Fox Jan 2005

Sex-Related Acoustic Changes In Voiceless English Fricatives, Shawn L. Nissen, Robert Allen Fox

Faculty Publications

This investigation is a comprehensive acoustic study of 4 voiceless fricatives (/f q s Ý/)in English produced by adults and pre- and postpubescent children aged 6–14 years. Vowel duration, amplitude, and several different spectral measures (including spectral tilt and spectral moments) were examined. Of specific interest was the pattern of normal development of the acoustic properties of fricatives and the nature of sex-specific patterns of fricative articulation in prepubescent children. Little evidence of amplitude or duration differences was found between speakers that was related to sex of the speaker. However, significant sex-specific differences in fricative articulation were found in all …

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Psychometrically Equivalent Mandarin Bisyllabic Speech Discrimination Materials Spoken By Male And Female Talkers, Shawn L. Nissen, Richard W. Harris, Lara-Jill Jennings, Dennis L. Eggett, Holly Buck Jan 2005

Psychometrically Equivalent Mandarin Bisyllabic Speech Discrimination Materials Spoken By Male And Female Talkers, Shawn L. Nissen, Richard W. Harris, Lara-Jill Jennings, Dennis L. Eggett, Holly Buck

Faculty Publications

The purpose of this study was to develop, digitally record, evaluate, and psychometrically equate a set of Mandarin bisyllabic word lists for use in measurement of speech discrimination. Familiar bisyllabic words were digitally recorded by male and female talkers of Standard Mandarin. Percentage of correct word recognition was measured for each word at ten intensity levels ( /5 to 40dB HL) in 5 dB increments using 20 normally hearing subjects. Using logistic regression, 200 words with the steepest logistic regression slopes were included in four psychometrically equivalent word lists of 50 words each, and eight half-lists of 25 words each. …

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Life On A Tricycle A Case Study Of Language Impairment From 4 To 19, Lee Robinson, Bonnie Brinton, Martin Fujiki Jan 2005

Life On A Tricycle A Case Study Of Language Impairment From 4 To 19, Lee Robinson, Bonnie Brinton, Martin Fujiki

Faculty Publications

This article presents a longitudinal case study of a child named Cody identified with specific language impairment. Cody was followed from 4 to 19 years of age, at which time he compared his social skills with those of peers: “It’s like they’re driving sports car and I’m on a tricycle.” His initial long- and short-term intervention goals are presented, along with the treatment methods employed and the resulting outcomes. Although long-term goals remained consistent, as the nature of Cody’s academic, social, and emotional challenges shifted, it was necessary to gear treatment to address his changing needs. Cody’s case illustrates the …

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Speech Interactions With Linguistic, Cognitive, And Visuomotor Tasks, Christopher Dromey, Emily Bates Jan 2005

Speech Interactions With Linguistic, Cognitive, And Visuomotor Tasks, Christopher Dromey, Emily Bates

Faculty Publications

Lip movements were examined across several repetitive speaking conditions (speech alone and speaking concurrently with a linguistic, cognitive, or visuomotor challenge task) in 20 young adults. Performance in these nonspeech activities was also compared between isolated tasks and concurrent speech conditions. Linguistic challenges resulted in increased spatiotemporal variability of lip displacement across repetitions. Motor challenges led to more rapid speech with smaller lip displacement. These qualitatively different changes suggest that different aspects of attention are required for linguistic versus manual visuomotor activity. Vocal intensity increased for all concurrent task conditions compared with speech alone, suggesting increased effort compared to the …

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Description Of A Program For Social Language Intervention: “If You Can Have A Conversation, You Can Have A Relationship, Lee Robinson, Bonnie Brinton, Martin Fujiki Jan 2004

Description Of A Program For Social Language Intervention: “If You Can Have A Conversation, You Can Have A Relationship, Lee Robinson, Bonnie Brinton, Martin Fujiki

Faculty Publications

Adolescents with impaired language comprehension and formulation skills often experience difficulty keeping up with the linguistic and social demands of peer interaction. This clinical exchange describes an individualized treatment program designed to increase the conversational skill of an adolescent male with language impairment. Treatment focused on increasing awareness of the listener’s needs and on balancing the exchange of conversational turns. Clinical performance, parent report, and client report were used to assess outcomes.

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Effects Of Concurrent Motor, Linguistic, Or Cognitive Tasks On Speech Motor Performance, Christopher Dromey, April Benson Jan 2003

Effects Of Concurrent Motor, Linguistic, Or Cognitive Tasks On Speech Motor Performance, Christopher Dromey, April Benson

Faculty Publications

This study examined the influence of 3 different types of concurrent tasks on speech motor performance. The goal was to uncover potential differences in speech movements relating to the nature of the secondary task. Twenty young adults repeated sentences either with or without simultaneous distractor activities. These distractions included a motor task (putting together washers, nuts, and bolts), a linguistic task (generating verbs from nouns), and a cognitive task(performing mental arithmetic). Lip movement data collected during the experimental conditions revealed decreases in displacement and velocity during the motor task. The linguistic and cognitive tasks were associated with increased spatiotemporal variability …

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An Imaging System Correlating Lip Shapes With Tongue Contact Patterns For Speech Pathology Research, Christopher Dromey, Daniel Bates, Xiaoqian Xu, Sameer Antani, D J. Lee Jan 2003

An Imaging System Correlating Lip Shapes With Tongue Contact Patterns For Speech Pathology Research, Christopher Dromey, Daniel Bates, Xiaoqian Xu, Sameer Antani, D J. Lee

Faculty Publications

In this research, an imaging system was built to work with a newly developed electronic device to help people produce sounds correctly. The system consists of two parts, the internal tongue contact pattern data collection and the external lip shape information analysis. The tongue position information was gathered using the palatometer, an innovative tongue contact pattern-tracking device invented by Dr. Samuel Fletcher. The lip shape information was collected by processing images taken from people articulating different sounds. We developed an efficient color image segmentation technique to extract lip contour points and form a closed curve for shape analysis. The geometry …

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A Vision System Performing Lip Shape Analysis For Speech Pathology Research, Christopher Dromey, D J. Lee, Daniel Bates, Xiaoqian Xu Jan 2003

A Vision System Performing Lip Shape Analysis For Speech Pathology Research, Christopher Dromey, D J. Lee, Daniel Bates, Xiaoqian Xu

Faculty Publications

We have built a machine vision system to perform lip shape analysis and recognition and to generate 3.D lip models for speech pathology research. The system employs two color cameras that are synchronized to capture image video pairs simultaneously. A novel color segmentation technique that converts the RGB color components to linear color space has been developed to extract lip shape contours. Lip shape of the viseme, the smallest visibly distinguishable unit of speech, is used to identify its corresponding image frame in the recorded image sequences. It is also used to reconstruct the 3-D lip shape model as a …

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Automated Grammatical Tagging Of Language Samples From Children With And Without Language Impairment, Deborah Millet Jan 2003

Automated Grammatical Tagging Of Language Samples From Children With And Without Language Impairment, Deborah Millet

Theses and Dissertations

Grammatical classification ("tagging") of words in language samples is a component of syntactic analysis for both clinical and research purposes. Previous studies have shown that probability-based software can be used to tag samples from adults and typically-developing children with high (about 95%) accuracy. The present study found that similar accuracy can be obtained in tagging samples from school-aged children with and without language impairment if the software uses tri-gram rather than bi-gram probabilities and large corpora are used to obtain probability information to train the tagging software.

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Spectral Measures And Perceptual Ratings Of Hypokinetic Dysarthria, Christopher Dromey Jan 2003

Spectral Measures And Perceptual Ratings Of Hypokinetic Dysarthria, Christopher Dromey

Faculty Publications

Ten individuals with Parkinson disease (PD) and hypokinetic dysarthria were compared with age-matched neurologically normal (NN) speakers on acoustic measures from speaking and vowel phonation tasks as well as on perceptual ratings of connected speech. Listeners identified differences between the groups when asked to judge the severity of vocal and articulatory impairment during reading. Several conventional acoustic measures failed to differentiate speakers with PD from NN speakers. However, measures of the shape (statistical moments) of the long term average spectrum (LTAS) revealed statistically significant differences between the groups across vowel phonation, reading and monologue tasks. The ease of computation of …

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Scoring Sentences Developmentally: An Analog Of Developmental Sentence Scoring, Amy Seal Jan 2002

Scoring Sentences Developmentally: An Analog Of Developmental Sentence Scoring, Amy Seal

Theses and Dissertations

A variety of tools have been developed to assist in the quantification and analysis of naturalistic language samples. In recent years, computer technology has been employed in language sample analysis. This study compares a new automated index, Scoring Sentences Developmentally (SSD), to two existing measures. Eighty samples from three corpora were manually analyzed using DSS and MLU and the processed by the automated software. Results show all three indices to be highly correlated, with correlations ranging from .62 to .98. The high correlations among scores support further investigation of the psychometric characteristics of the SSD software to determine its clinical …

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The Influence Of Pitch And Loudness Changes On The Acoustics Of Vocal Tremor, Christopher Dromey, Paul Warrick, Jonathan Irish Jan 2002

The Influence Of Pitch And Loudness Changes On The Acoustics Of Vocal Tremor, Christopher Dromey, Paul Warrick, Jonathan Irish

Faculty Publications

The effect of tremor on phonation is to modulate an otherwise steady sound source in its amplitude, fundamental frequency, or both. The severity of untreated vocal tremor has been reported to change under certain conditions that may be related to muscle tension. In order to better understand the phenomenon of vocal tremor, its acoustic properties were examined as individuals volitionally altered their pitch and loudness. These voice conditions were anticipated to alter the tension of the intrinsic laryngeal muscles. The voices of 10 individuals with a diagnosis of vocal tremor were recorded before participating in a longitudinal treatment study. They …

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Vibrato Rate Adjustment, Christopher Dromey, Neisha Carter, Arden Hopkin Jan 2002

Vibrato Rate Adjustment, Christopher Dromey, Neisha Carter, Arden Hopkin

Faculty Publications

Summary: The goal of the present study was to document the acoustic changes that occur as singers attempt to increase or decrease their vibrato rate to match target stimuli. Eight advanced singing students produced vowels with vibrato in three registers, both naturally and while attempting to match faster or slower rate stimuli. Slower rates were associated with lower intensity and less steady vibrato. Faster rates involved increased vibrato extent in the chest register and increased intensity in the head register. Singers whose spontaneous vibrato rates were naturally either slower or faster tended to also be relatively slower or faster when …

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The Treatment Of Essential Voice Tremor With Botulinum Toxin A: A Longitudinal Case Report, Christopher Dromey, Paul Warrick, Jonathan Irish, Lisa Durkin Jan 2000

The Treatment Of Essential Voice Tremor With Botulinum Toxin A: A Longitudinal Case Report, Christopher Dromey, Paul Warrick, Jonathan Irish, Lisa Durkin

Faculty Publications

Summary: The purpose of this study was to evaluate the effects of bilateral botulinum toxin injection into the thyroarytenoid (TA) muscles of a patient with essential voice tremor. Acoustic and aerodynamic data were collected weekly over a 16-week period. Flexible nasolaryngoscopy was performed prior to injection and 2, 6, 10, and 16 weeks post injection. Perceptual analyses of the acoustic and nasolaryngoscopic data were performed. A reduction in frequency tremor and, to a lesser extent, amplitude tremor was observed during the 1-10 week period. Estimated laryngeal resistance decreased after injection and was accompanied in perceptual measures by a reduction in …

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An Investigation Of The Effects Of Subthalamic Nucleus Stimulation On Acoustic Measures Of Voice, Christopher Dromey, Rajeev Kumar, Anthony E. Lang, Andres M. Lozano Jan 2000

An Investigation Of The Effects Of Subthalamic Nucleus Stimulation On Acoustic Measures Of Voice, Christopher Dromey, Rajeev Kumar, Anthony E. Lang, Andres M. Lozano

Faculty Publications

Summary: Seven patients with Parkinson’s disease were implanted with deep brain stimulators to provide chronic electrical stimulation to the subthalamic nucleus bilaterally. Acoustic recordings and neurologic assessments were undertaken before surgery in the medication-off and medication-on conditions and after surgery with and without electrical stimulation in the medication off and medication-on conditions. The data showed significant improvements in limb motor performance in response to medication before surgery and when the subthalamic nucleus was stimulated after surgery. Six months after surgery, there were small but statistically significant increases in sound pressure level and fundamental frequency variability in response to stimulation in …

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Botulinum Toxin For Essential Tremor Of The Voice With Multiple Anatomical Sites Of Tremor: A Crossover Design Study Of Unilateral Versus Bilateral Injection, Christopher Dromey, Paul Warrick, Jonathan C. Irish, Lisa Durkin, Anthony Parkiam, Anthony Lang Jan 2000

Botulinum Toxin For Essential Tremor Of The Voice With Multiple Anatomical Sites Of Tremor: A Crossover Design Study Of Unilateral Versus Bilateral Injection, Christopher Dromey, Paul Warrick, Jonathan C. Irish, Lisa Durkin, Anthony Parkiam, Anthony Lang

Faculty Publications

Objectives/Hypothesis: To evaluate the relative efficacy of unilateral and bilateral injections of botulinum toxin injection (BOTOX) in the treatment of essential tremor of the voice (ETV). Study Design: Prospective open-label crossover study. Methods: Patients referred to the Neurolaryngology Clinic at Toronto General Hospital with a diagnosis of ETV were eligible for the study. Patients were sequentially as-signed to receive BOTOX as either a bilateral 2.5-U or a unilateral 15-U electromyography-guided injection, followed by the alternative injection 16 to 18 weeks later. Acoustic, aerodynamic, and nasopharyngoscopic data were collected approximately 2, 6, 10, and16 weeks after each injection. Patients were asked …

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Acoustic And Perceptual Improvements In Tracheoesophageal Voice Using A Neck Strap, Christopher Dromey, Carol Kapusta-Shemie Jan 1999

Acoustic And Perceptual Improvements In Tracheoesophageal Voice Using A Neck Strap, Christopher Dromey, Carol Kapusta-Shemie

Faculty Publications

Tracheoesophageal (TE) speech, which relies on pulmonary air directed through a one-way valve from the trachea to the esophagus, has become an effective means of voice restoration for many alaryngeal speakers. Whereas the success rate for TE speech has been reported to reach 80% to 90%, complications are not uncommon. In a few cases, pouching of the neck at the level of the neoglottis has been observed. This has previously been reported to negatively affect functional communication, and has been associated with a flaccid or hypnotic vibratory segment. The application of pressure, either manually or by way of a neck …

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Intentional Changes In Sound Pressure Level And Rate: Their Impact On Measures Of Respiration, Phonation, And Articulation, Christopher Dromey, Lorraine Olson Ramig Jan 1998

Intentional Changes In Sound Pressure Level And Rate: Their Impact On Measures Of Respiration, Phonation, And Articulation, Christopher Dromey, Lorraine Olson Ramig

Faculty Publications

The purpose of the study was to compare the effects of changing sound pressure level (SPL) and rate on respiratory, phonatory, and articulatory behavior during sentence production. Ten subjects, 5 men and 5 women, repeated the sentence, "I sell a sapapple again," under 5 SPL and 5 rate conditions. From a multi-channel recording, measures were made of lung volume (LV), SPL, fundamental frequency (F0), semitone standard deviation (STSD), and upper and lower lip displacements and peak velocities. Loud speech led to increases in LV initiation, LV termination, F0, STSD, and articulatory displacements and peak velocities for both lips. Token-to-token variability …

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Approximations Of Open Quotient And Speed Quotient From Glottal Airflow And Egg Waveforms: Effects Of Measurement Criteria And Sound Pressure Level, Christopher Dromey, Christine M. Sapienza, Elaine T. Stathopoulos Jan 1998

Approximations Of Open Quotient And Speed Quotient From Glottal Airflow And Egg Waveforms: Effects Of Measurement Criteria And Sound Pressure Level, Christopher Dromey, Christine M. Sapienza, Elaine T. Stathopoulos

Faculty Publications

Summary: Noninvasive measures of vocal fold activity are useful for describing normal and disordered voice production. Measures of open and speed quotient from glottal airflow and electroglottographic (EGG) waveforms have been used to describe timing events associated with vocal fold vibration. To date, there has been little consistency in the measurement criteria used to calculate quotient values. In this study, criteria of 20% and 50% were applied to the AC amplitude of glottal airflow and inverted EGG waveforms for measurement of open quotient. Criteria of 20%, 50%, and 80%, and a midslope criterion that segmented the waveform between 20% and …

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