Electroencephalographic Classification Reveals Atypical Speech Motor Planning in Stuttering Adults.

PURPOSE: This study explores speech motor planning in adults who stutter (AWS) and adults who do not stutter (ANS) by applying machine learning algorithms to electroencephalographic (EEG) signals. In this study, we developed a technique to holistically examine neural activity differences in speaking and silent reading conditions across the entire cortical surface. This approach allows us to test the hypothesis that AWS will exhibit lower separability of the speech motor planning condition. METHOD: We used the silent reading condition as a control condition to isolate speech motor planning activity. We classified EEG signals from AWS and ANS individuals into speaking and silent reading categories using kernel support vector machines. We used relative complexities of the learned classifiers to compare speech motor planning discernibility for both classes. RESULTS: AWS group classifiers require a more complex decision boundary to separate speech motor planning and silent reading classes. CONCLUSIONS: These findings indicate that the EEG signals associated with speech motor planning are less discernible in AWS, which may result from altered neuronal dynamics in AWS. Our results support the hypothesis that AWS exhibit lower inherent separability of the silent reading and speech motor planning conditions. Further investigation may identify and compare the features leveraged for speech motor classification in AWS and ANS. These observations may have clinical value for developing novel speech therapies or assistive devices for AWS.

Phenome risk classification enables phenotypic imputation and gene discovery in developmental stuttering.

Developmental stuttering is a speech disorder characterized by disruption in the forward movement of speech. This disruption includes part-word and single-syllable repetitions, prolongations, and involuntary tension that blocks syllables and words, and the disorder has a life-time prevalence of 6-12%. Within Vanderbilt's electronic health record (EHR)-linked biorepository (BioVU), only 142 individuals out of 92,762 participants (0.15%) are identified with diagnostic ICD9/10 codes, suggesting a large portion of people who stutter do not have a record of diagnosis within the EHR. To identify individuals affected by stuttering within our EHR, we built a PheCode-driven Gini impurity-based classification and regression tree model, PheML, by using comorbidities enriched in individuals affected by stuttering as predicting features and imputing stuttering status as the outcome variable. Applying PheML in BioVU identified 9,239 genotyped affected individuals (a clinical prevalence of ∼10%) for downstream genetic analysis. Ancestry-stratified GWAS of PheML-imputed affected individuals and matched control individuals identified rs12613255, a variant near CYRIA on chromosome 2 (B = 0.323; p value = 1.31 × 10-8) in European-ancestry analysis and rs7837758 (B = 0.518; p value = 5.07 × 10-8), an intronic variant found within the ZMAT4 gene on chromosome 8, in African-ancestry analysis. Polygenic-risk prediction and concordance analysis in an independent clinically ascertained sample of developmental stuttering cases validate our GWAS findings in PheML-imputed affected and control individuals and demonstrate the clinical relevance of our population-based analysis for stuttering risk.

Evaluating parents' reactions to Children's stuttering using a Persian version of reaction to Speech Disfluency Scale.

OBJECTIVES: Stuttering is one of the most common speech disorders with many negative effects on children and their parents. The parents play a very important role in the treatment and management of children's stuttering. The parents' reactions to children's stuttering are pivotal in the exacerbation or improvement of stuttering. The present study aimed to investigate the parents' reactions to their children's stuttering using the Persian version of Reaction to Speech Disfluency Scale (RSDS). METHODS: The present study was conducted in two stages; phase 1: translation and cultural adaptation of RSDS into Persian and phase 2: investigation of the reaction of parents to children's stuttering using the RSDS. The first phase of the study included the following steps, forward translation, backward translation, content validity, face validity, and reliability of the scale using internal consistency and test-retest reliability. The second phase of the study was to examine the reactions of 110 parents of 3-6-year-old children who stutter by using the RSDS. Data were analyzed using SPSS software. RESULTS: The results of translation and cultural adaptation of the RSDS showed that the Persian version of RSDS has suitable validity. The internal consistency (Cronbach's alpha = 0.94) and the test-retest reliability (ICC = 0.98) were also appropriate for this scale. The most reactions of parents to children's stuttering were cognitive, emotional, and behavioral, respectively. The results of evaluating the maternal and paternal reactions separately indicated that the highest value of paternal reaction score was cognitive, behavioral and emotional reactions, respectively, while the highest value of maternal reaction score was cognitive, emotional and behavioral reactions, respectively. Differences between fathers and mothers were statistically significant only in emotional reaction subscale (P < 0.001). The mean overall score of the RSDS for all parents was 29, as well as 27.72 and 30.27 in fathers and mothers groups, respectively, but this differences between groups not statistically significant (P = 0.12). Comparing the scores between parents of boys and girls who stutter showed that the mean overall scores of cognitive, emotional, and behavioral subscales, and overall scores in the parents of girls who stutter was higher than in the parents of boys who stutter, and this difference was statistically significant in the emotional subscale and the overall score between the two groups (P < 0.05). CONCLUSION: The parental cognitive and behavioral reactions to children's stuttering had the maximum and minimum frequency, respectively. The paternal reactions to their children's stuttering were different from maternal reactions. The parents of girls who stutter in all subscales had a greater reaction compared to the parents of boys who stutter. Given the importance of the reactions of parents to their children's stuttering, the results of the present study can help to complete the information of therapists and researchers in this field.

'Exploring stuttering severity in the Egyptian Arabic speaking children who stutter: A correlation study of Bloodstein classification of stuttering severity and the stuttering severity instrument for children and Adults-Arabic Version'.

OBJECTIVE: The aim of this study was to explore the magnitude of stuttering severity in the Egyptian Arabic speaking children who stutter (CWS) by corelating stuttering severity grades assessed by Bloodstein classification of stuttering severity (BLS) and by the stuttering severity instrument for children and adults-Arabic version (ASSI). METHODS: 58 Egyptian Arabic speaking CWS aged 5-9 years and 9 months, were selected conveniently upon inclusion and exclusion criteria from patients frequented at the Phoniatrics clinic of El-Demerdash hospital (Ain Shams University). Through an observational cross-sectional study, the selected children underwent the Ain Shams university assessment protocol of fluency disorders, including clinician's assessment of stuttering severity by BLS classification and ASSI. The correlation between the grade of stuttering severity by BLS classification and ASSI were analyzed by Spearman's correlation coefficient and regression analysis. RESULTS: Significant positive correlation was found between grades of stuttering severity measured by BLS classification and ASSI. Among children with mild, moderate and severe degrees of stuttering by BLS classification, the score of their ASSI decrease as the child's age increases. The age of the participated CWS was significantly inversely related to the score of ASSI, yet it is not related to the grades of BLS classification. The age of onset of stuttering was not related to stuttering severity whether measured by BLS classification or ASSI. CONCLUSION: There is a significant positive relationship between stuttering severity measured by BLS classification and ASSI. Speech disfluencies counted by ASSI decreases as the child's age increases, in relation to stuttering severity by BLS classification. Clinicians should depend on more than one tool while assessing stuttering severity.

Subtypes of stuttering determined by latent class analysis in two Swiss epidemiological surveys.

AIMS: Associations between stuttering in childhood and a broad spectrum of risk factors, associated factors and comorbidities were examined in two large epidemiological studies. Subtypes of stuttering were then identified based on latent class analysis (LCA). METHODS: Data were from two representative Swiss population samples: PsyCoLaus (N = 4,874, age 35-82 years) and the ZInEP Epidemiology Survey (N = 1,500, age 20-41 years). Associations between stuttering and sociodemographic characteristics, familial aggregation, comorbidity and psychosocial risk / associated factors were investigated in both samples. LCAs were conducted on selected items from people in both samples who reported having stuttered in childhood. RESULTS: Initial analyses linked early anxiety disorders, such as separation anxiety disorder and overanxious disorder, to stuttering (PsyCoLaus). ADHD was associated with stuttering in both datasets. In the analyses of risk / associated factors, dysfunctional parental relationships, inter-parental violence and further childhood adversities were mutual predictors of stuttering. Moreover, comorbidities were seen with hay fever, asthma, eczema and psoriasis (PsyCoLaus). Subsequent LCA identified an unspecific group of persons who self-reported that they stuttered and a group defined by associations with psychosocial adversities (ZINEP, PsyCoLaus) and atopic diseases (PsyCoLaus). CONCLUSIONS: The two subtypes of developmental stuttering have different risk / associated factors and comorbidity patterns. Most of the factors are associated with vulnerability mechanisms that occur early in life and that have also been linked with other neurodevelopmental disorders. Both psychosocial and biological factors appear to be involved in the etiopathogenesis of stuttering.

Comparison of different speech tasks among adults who stutter and adults who do not stutter.

OBJECTIVES: In this study, we compared the performance of both fluent speakers and people who stutter in three different speaking situations: monologue speech, oral reading and choral reading. This study follows the assumption that the neuromotor control of speech can be influenced by external auditory stimuli in both speakers who stutter and speakers who do not stutter. METHOD: Seventeen adults who stutter and seventeen adults who do not stutter were assessed in three speaking tasks: monologue, oral reading (solo reading aloud) and choral reading (reading in unison with the evaluator). Speech fluency and rate were measured for each task. RESULTS: The participants who stuttered had a lower frequency of stuttering during choral reading than during monologue and oral reading. CONCLUSIONS: According to the dual premotor system model, choral speech enhanced fluency by providing external cues for the timing of each syllable compensating for deficient internal cues.

A preliminary investigation of daily variability of stuttering in adults.

PURPOSE: Variability in frequency of stuttering has made the results of treatment outcome studies difficult to interpret. Many factors that affect variability have been investigated; yet the typical range of variability experienced by speakers remains unknown. This study examined the day-to-day variability in the percentage of syllables containing stuttered and nonstuttered disfluencies in the speech of six adult speakers in three spontaneous speaking situations and two reading tasks. METHODS: The frequency of moments stuttering during the tasks were compared within and between speakers and days to document the degree of variability in stuttering frequency and explore whether there were any consistent patterns. The Stuttering Severity Instrument-Fourth Edition (SSI-4) and Overall Assessment of the Speaker's Experience of Stuttering for Adults (OASES-A) were also tested for day-to-day variability. Correlations between frequency, severity, and life impact were made. RESULTS: The primary result of this study was the large range over which frequency of stuttering varied from day to day for the same individual. This variability did not correlate with any measures of stuttering severity but did correlate with life impact as measured by the OASES-A. No global pattern was detected in variability from day to day within or between participants. However, there were significantly more nonstuttered disfluencies present during the spontaneous speaking tasks than during the reading tasks. The day-to-day variability in the life impact of the disorder (OASES-A) was less than the day-to-day variability in observable stuttering behavior (percentage of syllables stuttered and SSI-4). CONCLUSION: Frequency of stuttering varies significantly from situation to situation and day to day, with observed variability exceeding the degree of change often reported in treatment outcomes studies from before to after treatment. This variability must be accounted for in future clinical and scientific work.

Comparison of different speech tasks among adults who stutter and adults who do not stutter

OBJECTIVES: In this study, we compared the performance of both fluent speakers and people who stutter in three different speaking situations: monologue speech, oral reading and choral reading. This study follows the assumption that the neuromotor control of speech can be influenced by external auditory stimuli in both speakers who stutter and speakers who do not stutter. METHOD: Seventeen adults who stutter and seventeen adults who do not stutter were assessed in three speaking tasks: monologue, oral reading (solo reading aloud) and choral reading (reading in unison with the evaluator). Speech fluency and rate were measured for each task. RESULTS: The participants who stuttered had a lower frequency of stuttering during choral reading than during monologue and oral reading. CONCLUSIONS: According to the dual premotor system model, choral speech enhanced fluency by providing external cues for the timing of each syllable compensating for deficient internal cues.

Factors involved in the identification of stuttering severity in a foreign language.

Speech-language pathologists nowadays are more and more confronted with clients who speak a language different from their own mother tongue. The assessment of persons who speak a foreign language poses particular challenges. The present study investigated the possible role and interplay of factors involved in the identification of stuttering severity in a foreign language. Nineteen speech-language pathologists from five different countries (i.e. Iceland, Sweden, Norway, Finland, and Belgium) rated stuttering severity of speech samples featuring persons who stutter speaking Icelandic, Swedish, Norwegian, or Dutch. Additionally, they were asked to score how easy they found it to rate the samples. Accuracy of rating stuttering severity in another language appeared to be foremost determined by the client's stuttering severity, while experienced ease of rating stuttering severity was essentially related to closeness of the language of the clinician to that of the client and familiarity of the clinician with the client's language. Stuttering measurement training programmes in different languages are needed.

Relation of motor, linguistic and temperament factors in epidemiologic subtypes of persistent and recovered stuttering: Initial findings.

PURPOSE: The purpose of this study was to determine the presence of any patterns reflecting underlying subtypes of persistence and recovery across epidemiologic, motor, language, and temperament domains in the same group of children beginning to stutter and followed for several years. METHODS: Participants were 58 2-4-year-old CWS and 40 age and gender matched NFC from four different sites in the Midwest. At the end of the multi-year study, stuttering children were classified as Persistent or Recovered. The same protocol obtaining data to measure stuttering, motor, language and temperament characteristics was used at each site. They have not been included in previous reports. RESULTS: The Persistent group performed consistently differently from the Recovered and Control groups. They performed lower on standardized language tests and in phonological accuracy, had greater kinematic variability, and were judged by their parents to be more negative in temperament. CONCLUSIONS: The present study provides data supporting the hypothesis that subtypes of stuttering can be identified along persistency/recovery lines, but results were not definitive. EDUCATIONAL OBJECTIVES: Readers will be able to (a) describe the current state of subtypes of stuttering research; (b) summarize possible contributions of epidemiologic, motoric, linguistic and temperament to such subtyping with regard to persistency and recovery.

Developing strategies to be added to the protocol for antenatal care: An exercise and birth preparation program

OBJECTIVES: To describe the implementation process of a birth preparation program, the activities in the protocol for physical and birth preparation exercises, and the educational activities that have been evaluated regarding effectiveness and women's satisfaction. The birth preparation program described was developed with the following objectives: to prevent lumbopelvic pain, urinary incontinence and anxiety; to encourage the practice of physical activity during pregnancy and of positions and exercises for non-pharmacological pain relief during labor; and to discuss information that would help women to have autonomy during labor. METHODS: The program comprised the following activities: supervised physical exercise, relaxation exercises, and educational activities (explanations of lumbopelvic pain prevention, pelvic floor function, labor and delivery, and which non-pharmacological pain relief to use during labor) provided regularly after prenatal consultations. These activities were held monthly, starting when the women joined the program at 18–24 weeks of pregnancy and continuing until 30 weeks of pregnancy, fortnightly thereafter from 31 to 36 weeks of pregnancy, and then weekly from the 37th week until delivery. Information and printed materials regarding the physical exercises to be performed at home were provided. Clinicaltrials.gov: NCT01155804. RESULTS: The program was an innovative type of intervention that systematized birth preparation activities that were organized to encompass aspects related both to pregnancy and to labor and that included physical, educational and home-based activities. CONCLUSIONS: The detailed description of the protocol used may serve as a basis for further studies and also for the implementation of birth preparation programs within the healthcare system in different settings. .

Measuring Stuttering in Preschool-Aged Children across Different Languages: An International Study.

BACKGROUND/AIMS: Many speech-language pathologists (SLPs) are working in linguistically diverse communities and have to identify and measure stuttering in a language other than their own. The aim of the present study was to extend our understanding of how well SLPs can measure stuttering in other languages and to encourage collaboration between SLPs across cultures. METHODS: Speech samples consisted of seven preschool-aged children each speaking one of the following languages: Danish, English, French, German, Greek, Italian, and Persian (Farsi). The judges were classified in seven groups of SLPs (n = 170) each speaking one of the seven languages of the children and two more English-speaking groups. Each judge rated the severity of stuttering in each child using a 10-point scale. The study was conducted over the Internet. RESULTS: Overall, the judges' proficiency in a child's language was not systematically related to the variability and agreement of the severity ratings, accounting for maximally 4.6% of the variance. CONCLUSION: SLPs should not be overly concerned about the appropriateness of their severity ratings if they feel less proficient in the native language of the stuttering children. It may also be encouraging for beginning clinicians that the severity ratings were not systematically related to professional experience.

Event- and interval-based measurement of stuttering: a review.

BACKGROUND: Event- and interval-based measurements are two different ways of computing frequency of stuttering. Interval-based methodology emerged as an alternative measure to overcome problems associated with reproducibility in the event-based methodology. No review has been made to study the effect of methodological factors in interval-based absolute reliability data or to compute the agreement between the two methodologies in terms of inter-judge, intra-judge and accuracy (i.e., correspondence between raters' scores and an established criterion). AIMS: To provide a review related to reproducibility of event-based and time-interval measurement, and to verify the effect of methodological factors (training, experience, interval duration, sample presentation order and judgment conditions) on agreement of time-interval measurement; in addition, to determine if it is possible to quantify the agreement between the two methodologies METHODS & PROCEDURES: The first two authors searched for articles on ERIC, MEDLINE, PubMed, B-on, CENTRAL and Dissertation Abstracts during January-February 2013 and retrieved 495 articles. Forty-eight articles were selected for review. Content tables were constructed with the main findings. MAIN CONTRIBUTION: Articles related to event-based measurements revealed values of inter- and intra-judge greater than 0.70 and agreement percentages beyond 80%. The articles related to time-interval measures revealed that, in general, judges with more experience with stuttering presented significantly higher levels of intra- and inter-judge agreement. Inter- and intra-judge values were beyond the references for high reproducibility values for both methodologies. Accuracy (regarding the closeness of raters' judgements with an established criterion), intra- and inter-judge agreement were higher for trained groups when compared with non-trained groups. Sample presentation order and audio/video conditions did not result in differences in inter- or intra-judge results. A duration of 5 s for an interval appears to be an acceptable agreement. Explanation for high reproducibility values as well as parameter choice to report those data are discussed. CONCLUSIONS & IMPLICATIONS: Both interval- and event-based methodologies used trained or experienced judges for inter- and intra-judge determination and data were beyond the references for good reproducibility values. Inter- and intra-judge values were reported in different metric scales among event- and interval-based methods studies, making it unfeasible to quantify the agreement between the two methods.

Intensive non-avoidance group therapy with stutterer adults: preliminary results.

PURPOSE: The purpose of the present study was to evaluate and document the use and efficacy of intensive non-avoidance group treatment for Bulgarian adults who stutter (AWS), to specify that changes are adopted in different speech situations (in the stabilization phase), and to demonstrate that changes are maintained after intensive therapy. METHODS: Participants were AWS (n=15, 12 males) with an average age of 25.2 years) Bulgarian native-speakers. Twelve participants were University students and three were clients with tertiary education in different areas. All participants were enrolled in First (overall effect) and Second (interim effect) Stages of Intensive Non-Avoidance Treatment for Stuttering. Van Riper's stuttering modification therapy approach was employed; the latter considers a non-avoidance treatment for stuttering. The treatment was conducted in participants' native Bulgarian language. RESULTS: AWS, as a group (n=15), significantly decreased the number of stuttered utterances after intensive treatment; findings were consistent for participants with moderate as well as severe stuttering. Likewise, there was a significant decrease in duration (in seconds) of disfluencies after treatment; findings were consistent for participants with moderate as well as severe stuttering. Eighty percent of AWS used cancellation immediately and six months after treatment, 65% mastered preparatory sets immediately and six months after treatment, 35% exhibited pull-outs immediately after treatment and 55%, six months post-treatment. CONCLUSION: These preliminary findings were taken to suggest that intensive non-avoidance treatment for stuttering can be successfully employed with Bulgarian adults who stutter. Special focus was on the positive fluency changes that occurred during the course of therapy regarding the duration of disfluencies in seconds, and index of disfluencies.

Scores on Riley's stuttering severity instrument versions three and four for samples of different length and for different types of speech material.

Riley stated that the minimum speech sample length necessary to compute his stuttering severity estimates was 200 syllables. This was investigated. Procedures supplied for the assessment of readers and non-readers were examined to see whether they give equivalent scores. Recordings of spontaneous speech samples from 23 young children (aged between 2 years 8 months and 6 years 3 months) and 31 older children (aged between 10 years 0 months and 14 years 7 months) were made. Riley's severity estimates were scored on extracts of different lengths. The older children provided spontaneous and read samples, which were scored for severity according to reader and non-reader procedures. Analysis of variance supported the use of 200-syllable-long samples as the minimum necessary for obtaining severity scores. There was no significant difference in SSI-3 scores for the older children when the reader and non-reader procedures were used. Samples that are 200-syllables long are the minimum that is appropriate for obtaining stable Riley's severity scores. The procedural variants provide similar severity scores.

Intensive non-avoidance group therapy with stutterer adults: preliminary results / Terapia intensiva de enfrentamento em grupo com adultos gagos: resultados preliminares

PURPOSE: The purpose of the present study was to evaluate and document the use and efficacy of intensive non-avoidance group treatment for Bulgarian adults who stutter (AWS), to specify that changes are adopted in different speech situations (in the stabilization phase), and to demonstrate that changes are maintained after intensive therapy. METHODS: Participants were AWS (n=15, 12 males) with an average age of 25.2 years) Bulgarian native-speakers. Twelve participants were University students and three were clients with tertiary education in different areas. All participants were enrolled in First (overall effect) and Second (interim effect) Stages of Intensive Non-Avoidance Treatment for Stuttering. Van Riper's stuttering modification therapy approach was employed; the latter considers a non-avoidance treatment for stuttering. The treatment was conducted in participants' native Bulgarian language. RESULTS: AWS, as a group (n=15), significantly decreased the number of stuttered utterances after intensive treatment; findings were consistent for participants with moderate as well as severe stuttering. Likewise, there was a significant decrease in duration (in seconds) of disfluencies after treatment; findings were consistent for participants with moderate as well as severe stuttering. Eighty percent of AWS used cancellation immediately and six months after treatment, 65% mastered preparatory sets immediately and six months after treatment, 35% exhibited pull-outs immediately after treatment and 55%, six months post-treatment. CONCLUSION: These preliminary findings were taken to suggest that intensive non-avoidance treatment for stuttering can be successfully employed with Bulgarian adults who stutter. Special focus was on the positive fluency changes that occurred during the course of therapy regarding the duration of disfluencies in seconds, and index of disfluencies. .

OBJETIVO: O objetivo deste estudo foi avaliar e documentar o uso e a eficácia do tratamento intensivo de enfrentamento em grupo em adultos com gagueira (ACG) búlgaros, especificar quais mudanças são adotadas em diferentes situações de fala (em fase de estabilização), e demonstrar que as mudanças são mantidas após a terapia intensiva. MÉTODOS: Os participantes eram ACG (n = 15, 12 do sexo masculino, com idade média de 25,2 anos), falantes nativos de búlgaro. Doze participantes eram estudantes universitários e três tinham ensino superior em diferentes áreas. Todos os participantes foram inscritos no Primeiro (efeito total) e Segundo (efeito provisório) Estágios do Tratamento Intensivo de Enfrentamento para Gagueira. A abordagem empregada foi a terapia de modificação da gagueira de Van Riper, considerado um tratamento de enfrentamento para a gagueira. O tratamento foi realizado em búlgaro, língua nativa dos participantes. RESULTADOS: Como um grupo, os ACG (n = 15) apresentaram uma diminuição significativa no número de elocuções gaguejadas após tratamento intensivo. Estes resultados foram consistentes para os participantes com gagueira moderada e grave. Da mesma forma, houve uma diminuição significativa na duração (em segundos) das rupturas após o tratamento, sendo estes resultados também consistentes para os participantes com gagueira moderada e grave. Oitenta por cento dos ACG utilizaram o cancelamento imediatamente e seis meses após o tratamento, 65% dominaram os movimentos preparatórios imediatamente e seis meses após o tratamento, 35% apresentaram uso da técnica do pull-out imediatamente após o tratamento, e 55% o apresentaram seis meses após o tratamento. CONCLUSÃO: Estes resultados preliminares sugerem que o tratamento ...

The role of language familiarity in bilingual stuttering assessment.

The aim of this study was to evaluate the ability of English-speaking speech-language pathologists (SLPs) to evaluate stuttering behaviour in two Spanish-English bilingual adults who stutter (AWS1 and AWS2). The English-speaking SLPs were asked to judge the frequency, severity, type, duration, and physical concomitants of stuttering in both languages of the two AWS. The combined results from the English-speaking SLPs were then compared to the judgements of three Spanish-English bilingual SLPs. Results indicated that English-speaking SLPs (1) judged stuttering frequency to be greater in Spanish than English for AWS1, and equal in Spanish and English for AWS2, (2) were more accurate at evaluating individual moments of stuttering for the English samples compared to the Spanish samples, (3) identified fewer and less severe stuttering behaviours than the bilingual SLPs in both languages, and (4) were accurate judges of overall stuttering severity in both languages. The results correspond to past research examining the accuracy of stuttering evaluations in unfamiliar languages. Possible explanations for the findings, clinical implications, and future research directions are discussed.

Clinician percent syllables stuttered, clinician severity ratings and speaker severity ratings: are they interchangeable?

BACKGROUND: At present, percent syllables stuttered (%SS) is the gold standard outcome measure for behavioural stuttering treatment research. However, ordinal severity rating (SR) procedures have some inherent advantages over that method. AIMS: To establish the relationship between Clinician %SS, Clinician SR and self-reported Speaker SR. To investigate whether Clinician SRs and Speaker SRs can be used interchangeably. METHOD & PROCEDURES: Participants were three experienced speech-language pathologist (SLP) judges and 87 adults who stuttered. Adults who stuttered received a 10-min unscheduled telephone call at the conclusion of which they self-reported a SR using a nine-point scale. The SLPs measured the stuttering for these conversations with %SS and also with the SR scale. The mean scores for Clinician %SS and Clinician SR were compared with Speaker SR using appropriate indices of relative and absolute reliability. Relative reliability indices deal with the rank order of participants in a sample and whether they can be distinguished from each other. However, absolute reliability indices are related to the closeness of the measurement scores to each other and to a hypothetical true score. OUTCOMES & RESULTS: Strong correlations were found between Clinician %SS and Clinician SR, and also between Clinician %SS and Speaker SR, although with higher values in the former case. Additionally, very high correlations showed acceptable relative reliability between Clinician SR and Speaker SR. However, absolute reliability in terms of standard error of measurement and limits of agreement was poor for Clinician SR and Speaker SR. CONCLUSIONS & IMPLICATIONS: The results suggest that Clinician SR and Speaker SR cannot be used interchangeably to measure temporal stuttering severity changes for an individual client. However, researchers might use these two measures interchangeably in research contexts, such as clinical trials, where changes of the entire group are of interest to determine and compare treatment effect size across trials.

Dysfluencies in the speech of adults with intellectual disabilities and reported speech difficulties.

BACKGROUND: In individuals with an intellectual disability, speech dysfluencies are more common than in the general population. In clinical practice, these fluency disorders are generally diagnosed and treated as stuttering rather than cluttering. PURPOSE: To characterise the type of dysfluencies in adults with intellectual disabilities and reported speech difficulties with an emphasis on manifestations of stuttering and cluttering, which distinction is to help optimise treatment aimed at improving fluency and intelligibility. METHOD: The dysfluencies in the spontaneous speech of 28 adults (18-40 years; 16 men) with mild and moderate intellectual disabilities (IQs 40-70), who were characterised as poorly intelligible by their caregivers, were analysed using the speech norms for typically developing adults and children. The speakers were subsequently assigned to different diagnostic categories by relating their resulting dysfluency profiles to mean articulatory rate and articulatory rate variability. RESULTS: Twenty-two (75%) of the participants showed clinically significant dysfluencies, of which 21% were classified as cluttering, 29% as cluttering-stuttering and 25% as clear cluttering at normal articulatory rate. The characteristic pattern of stuttering did not occur. CONCLUSION: The dysfluencies in the speech of adults with intellectual disabilities and poor intelligibility show patterns that are specific for this population. Together, the results suggest that in this specific group of dysfluent speakers interventions should be aimed at cluttering rather than stuttering. LEARNING OUTCOMES: The reader will be able to (1) describe patterns of dysfluencies in the speech of adults with intellectual disabilities that are specific for this group of people, (2) explain that a high rate of dysfluencies in speech is potentially a major determiner of poor intelligibility in adults with ID and (3) describe suggestions for intervention focusing on cluttering rather than stuttering in dysfluent speakers with ID.

Lexical category influences in Persian children who stutter.

This article explores the effect that words from different lexical categories have on disfluency in 12 Persian children, ten boys and two girls, who stutter. They were aged 7 years 5 months to 10 years 6 months. Words from the participants' narrative and reading samples (sub-tests of the Reading and Dyslexia Test validated for Persian school-aged children) were categorized as content, function, or content-function, and stuttering-like disfluencies were coded in each speech sample. Content and content-function words were significantly more likely to show stuttering-like disfluencies than function words. The distribution of symptom types over content and content-function words was similar, and differed from the distribution seen in function words. The symptom type analysis also supported the view that whole-word repetitions should not be grouped with other stuttering-like disfluencies.