Infants struggle to apply earlier-demonstrated sound-discrimination abilities to later word-learning, attending to non-constrastive acoustic dimensions (e.g., Hay et al., 2015), and not always to contrastive dimensions (e.g., Stager & Werker, 1997). One hint about the nature of infants' difficulties comes from the observation that input from multiple talkers can improve word learning (Rost & McMurray, 2009). This may be because, when a single talker says both of the to-be-learned words, consistent talker's-voice characteristics make the acoustics of the two words more overlapping (Apfelbaum & McMurray, 2011). Here, we test that notion. We taught 14-month-old infants two similar-sounding words in the Switch habituation paradigm. The same amount of overall talker variability was present as in prior multiple-talker experiments, but male and female talkers said different words, creating a gender-word correlation. Under an-acoustic-similarity account, correlated talker gender should help to separate words-acoustically and facilitate learning. Instead, we found that correlated talker gender impaired learning of word-object pairings compared with uncorrelated talker gender-even when gender-word pairings were always maintained in test-casting doubt on one account of the beneficial effects of talker variability. We discuss several alternate potential explanations for this effect.

The lack of culturally appropriate norms for assessing the speech and language status of Malaysian children has been an ongoing issue in Malaysia. At present, there are no normative data against which to assess the phonological skills of Malaysian children. Malaysian Chinese children are usually bilingual or multilingual. They acquire English, Mandarin Chinese and Malay during their preschool years. English that is used in Malaysia is commonly recognized as Malaysian English (MalE). MalE has distinctive phonological characteristics that are different from those of so-called Standard English (SE). However, the variations of MalE may not be completely understood by many speech-language pathologists (SLPs) in Malaysia, and this may lead to difficulty in differentiating speech differences resulting from MalE dialectal features and true speech disorders. As well as establishing speech norms for MalE speaking children, information is needed about the current assessment practices of the phonological development of MalE speaking children. Three studies were carried out for the present thesis. The first study was designed to provide insight into Malaysian SLPs’ perspectives on the current use of articulation and phonology assessments in the country. It reports the results of a survey of 38 Malaysian SLPs in term of the types of articulation and phonological assessments currently used, SLPs’ perceptions about the adequacy and accuracy of current articulation and phonological assessment in meeting clinical needs, the experiences of SLPs in using current articulation and phonological assessments, as well as their perception of the need for further research in the areas of articulation and phonology. The findings indicated that informal articulation or phonological assessments were widely used. Only a minority of the respondents used standardized articulation or phonological assessments. The majority of the respondents felt that the lack of locally developed standardized tests and the utilization of informal assessments of articulation and phonology in their clinics did not provide accurate diagnoses or intervention plans. They felt that there was a need for collecting phonological developmental data and creating articulation and phonology assessments for Malaysian children. The second study was designed to identify characteristics of the consonant and vowel inventories of MalE as well as phonetic realizations of speech sounds, by investigating the speech production of ten adult Chinese speakers of MalE. The participants were asked to read a list of 206 single words which contained all expected MalE consonants, consonant clusters and vowels. These speech sounds were sampled in several different words and in different syllable-word positions. This study goes beyond previous studies of MalE phonology by using a quantitative auditory phonetic analysis. The characteristics observed were first categorized according to their frequency of occurrence and then further grouped into categories based on the possible influences of British English or American English as well as local Malaysian languages (Mandarin Chinese and Malay) and dialects. The interference patterns within MalE resulting from the influence of local languages and Chinese dialects were also discussed. The phonological features of MalE which converged with developmental phonological processes in SE children were explored. An understanding of the phonological features and realizations of MalE speech sounds is important because this will help speech-language pathologists to differentiate dialectal phonological features exhibited by MalE speaking children from phonological differences and disorders. The third study which was also the major study of this thesis was designed to provide valid and reliable normative data for the phonological development of MalE speaking Chinese children between the ages of 3 and 7 years. This study provided a description of the children’s phonological system in MalE in terms of i) age of acquisition of speech sounds, ii) speech sound accuracy and iii) phonological process use. 264 typically developing English speaking Malaysian Chinese children between the ages of 3 and 7 years were recruited to participate in this cross-sectional study. In a pilot study, eleven words were eliminated from the list used in the second study, leaving a list of 195 words which sampled consonants, consonant clusters and vowels in various syllable-word positions and phonotactic structures. The words were illustrated and presented colourfully in composite pictures to elicit a large and well-controlled single word speech sample. All the speech data gained were transcribed phonetically and analyzed quantitatively. The findings revealed that MalE children’s speech sound accuracy was underestimated when MalE dialectal features were not taken into consideration. MalE speaking children exhibited phonological acquisition patterns that were both similar and different to SE. The differences found were mainly due to the cross-linguistic effects of Mandarin Chinese and Malay which were acquired at the same time by MalE speaking children. The influence of Mandarin Chinese and Malay appeared to accelerate or delay the phonological acquisition of MalE based on phonetic similarity theory. The findings of the present study highlight the need to consider MalE dialectal features in the phonological analysis of MalE speaking children. The differences in phonological acquisition of MalE and SE indicate that the norms of SE are not suitable to be used for MalE speaking children. This study will provide useful and locally appropriate normative developmental data on phonological acquisition for MalE speaking Chinese children. Speech-language pathologists in Malaysia will be able to use it as a guideline in assessing and treating clients with articulation and phonological disorders. In addition, these normative developmental data are a prerequisite to the eventual establishment of a phonological assessment tool specifically designed for MalE.

This study examined the effects of a vocabulary intervention for 3 children with cleft lip and/or palate who showed limited consonant inventories and delayed expressive language. In a multiple baseline design across behaviors, a vocabulary intervention was implemented using a milieu model. The treatment produced an increase in vocabulary production that generalized to a conversational language sample in the clinic and home as reported by parents. Phonological variables, including consonant repertoire and syllable structure, were monitored before and after language treatment for all children. Phonological performance improved and did not need to be addressed as a separate goal in intervention.

No description available.

The present study aims to investigate the phonological development of typically developing monolingual Swedish speaking children aged three to four years. The result could be used in the standardization of a new phonological test material for clinical speech and language pathology assessments. One-hundred and thirty four children aged three and four years (73 girls and 61 boys) were assessed with the new material. The children were tested in kindergartens in three communities in southeastern Sweden. Their assessments were audio recorded, transcribed phonetically and analyzed with Percentage Phonemes Correct (PPC) and Percentage of Words Correct (PWC). An analysis of speech error patterns of substitutions of phonemes, reduction of consonant clusters and word structural deviations was conducted. The data recorded from the children were divided and analyzed in four semi-annual intervals and two annual intervals. The result shows a clear developmental trend with children in the older age group having a higher PPC and PWC than the younger children. Significant differences were found between the groups in annual intervals. Significant differences could only be demonstrated between the youngest age group and the other groups at semi-annual intervals. No significant gender differences were observed. Most of the errors of individual phonemes and consonant clusters among children in all age groups were distortions rather than substitutions, but the younger children simplified consonant clusters more often.

Consonant assimilation between noncontiguous consonants within words is one of the characteristic error patterns for children reported in observations of the earliest periods of speech acquisition. Previous analyses of consonant assimilation in young children have been based on formal phonological theories. However, phonological perspectives do not provide comprehensive explanations for potential mechanisms underlying children’s output forms when they are different from adult forms. The present study tests the hypothesis that functionalist phonetic approaches have the potential to provide a more comprehensive explanation for assimilation patterns in children’s speech output. Consonant assimilation patterns were observed from the onset of word use (approximately 12 months) to 36 months of age in ten English-speaking children. Assimilated forms in consonant-vowel-consonant (CVC) and consonant-vowel-consonant-vowel (CVCV) words produced by these children were analyzed. Predictions based on the Frame/Content perspective were evaluated relative to place and manner characteristics, vowel context, word level, and development over time. Results confirmed the prediction that motorically less available forms assimilate to more available forms in children acquiring ambient language speech patterns. Labial and coronal place of articulation more frequently motivated assimilation than dorsal. Stop and nasal manner of articulation more frequently motivated assimilation than fricative. The vowel context effects in assimilated forms were stronger for lingual consonants than labials and greater for CVCV more than CVC word forms. A word shape effect was observed related to place characteristics, direction of assimilation, and vowel context. A word position effect was observed for manner assimilations. Analysis of developmental trends revealed that children maintained a preference for motorically available forms in assimilations. The vowel context effects decreased over time. These findings suggest that patterns of consonant assimilation in these children are strongly motivated by behaviors already available within their production system capacities from the pre-linguistic babbling period, rather than being driven by patterns found in the targets they are attempting. Results also suggest that perceptual influences from language input may influence assimilation patterns to a lesser extent. Functionalist phonetic approaches that emphasize the understating of the production system and perceptual influences played a seminal role in understanding of children’s speech development relative to assimilation patterns. / text

Föreliggande studie syftar till att undersöka fonologisk förmåga samt samla referensdata till kortversionen av det fonologiska bedömningsmaterialet Linköpingsundersökningen (LINUS) för svenska barn i åldersgruppen 4–5 år. Totalt medverkade 70 barn, 43 flickor och 27 pojkar (medelålder 54 månader). Barnen rekryterades på förskolor i områden som låg nära det socioekonomiska medelvärdet för riket. I studien bedömdes vilka fonem och konsonantförbindelser som fanns etablerade hos barnen. Percentage Phonemes Correct (PPC) och Percentage Words Correct (PWC) beräknades och förekomst av strukturavvikelser analyserades. Barnen delades upp i två halvårsgrupper (4;0–4;6 och 4;6–5;0). Vid jämförelse mellan de två grupperna visades att de fonem och konsonantförbindelser som etablerats var mycket lika. Det fanns statistiskt signifikanta skillnader mellan halvårsgrupperna gällande PPC och PWC, där den äldre halvårsgruppen hade en större andel korrekta fonem (p=0,02) samt ord (p=0,02). Den yngre halvårsgruppen hade en större förekomst av interdentalisering (s→θ) (p=0,03) och palatalisering av /s/ (s→ɕ) (p=0,003). Skillnaden mellan halvårsgrupperna var statistiskt signifikant. Materialet kan användas av svenska logopeder för bedömning av barns fonologi. / The study objective was to investigate phonological ability in children aged 4–5 years and to assemble reference data for the short version of the Swedish phonological assessment material, Linköpingsundersökningen (LINUS). In total, 70 children participated in the study, 43 girls and 27 boys (average age 54 months). The children were recruited at preschools in areas that were socioeconomically close to the national average. An assessment was made of the children’s phonology using the short version of the new phonological material. Percentage Phonemes Correct (PPC) and Percentage Words Correct (PWC) were calculated and word structure deviations were analyzed. The children were divided into two half-year groups (4;0–4;6 and 4;6–5;0). When comparing the results of the two age groups similarities regarding acquired phonemes and consonant clusters were found. Significant differences in PPC (p=0,02) and PWC (p=0,02) were found between the two half-year groups where the older group had a higher proportion of correct phonemes (94,2 %) and words (76,1 %). Interdentalization (s→θ) (p =0,03), and palatalization of /s/ (s→ɕ) (p =0,003) were more present in the younger age group and there was a significant difference between the two half-year groups. This material can be used by Speech-Language Pathologists in Sweden for phonological screening.

Föreliggande studie syftade till att undersöka fonologin hos svensktalande barn mellan 3 och 4 år. I studien medverkar 69 barn, varav 33 pojkar och 36 flickor. Bedömningen genomfördes med ett nytt fonologisk bedömningsmaterial, LINUS kortversion. Testerna utfördes i områden belägna i tre kommuner i sydöstra Sverige där socioekonomisk status låg nära riksgenomsnittet. Bedömningarna spelades in, transkriberades och analyserades av två bedömare. Analysen bestod av Percentage of Word Correct (PWC), Percentage of Phonemes Correct (PPC), förekomst av assimilation, metates och epentes, förenkling av konsonantförbindelse, vokal- och konsonantsubstitution, reduplikation samt utelämning av obetonad stavelse och enskild konsonant. Vidare bedömdes vilka fonem som var etablerade hos barnen. Kriteriet för etablering av fonem sattes till > 90 % korrekt producerat fonem hos > 90 % av barnen. Tolv av svenskans 18 konsonantfonem var etablerade hos svensktalande treåringar med typisk språkutveckling. De fonem som vållade mest svårigheter var /ɧ/, /r/, /ʈ/ och /ɕ/. Genomsnittlig PWC var 61,3 % och genomsnittlig PPC var 88,7 %.  Inga statistiskt signifikanta skillnader hittades mellan könen eller halvårsgrupperna gällande PWC och PPC. Förekomst av assimilation, metates och epentes, förenkling av konsonantförbindelse, vokal- och konsonantsubstitution, reduplikation samt utelämning av obetonad stavelse och enskild konsonant hittades. Den mest förekommande avvikelsen var substitution medan den minst förekommande var reduplikation. / The present study aimed to examine the phonology of typically developed Swedish-speaking children between 3 and 4 years of age. Sixty-nine children; 33 boys and 36 girls were assessed with the short version of a new phonological assessment material called LINUS. The tests were conducted in areas located in three municipalities in southeastern Sweden, where socioeconomic status was close to the national average. Audio-recordings of the assessments were transcribed and analyzed by the authors. The analysis consisted of Percentage of Word Correct (PWC), Percentage of Phonemes Correct (PPC), the presence of assimilation, metathesis and epenthesis, cluster reduction, vowel and consonant substitution, reduplication and deletion of unstressed syllables or single consonants. Further identification was made of the phonemes that were established. The criterion for the establishment of phonemes was set to > 90 % correct produced phonemes in > 90 % of the children. Twelve of the 18 Swedish consonant phonemes were established by Swedish-speaking three year olds with typical language development. The phonemes which caused most trouble were /ɧ/, /r/, /ʈ/ and /ɕ/. Average PWC was 61.3 % and average PPC was 88.7 %. No significant differences were found between gender or the two age groups regarding PWC and PPC. Presence of assimilation, metathesis and epenthesis, cluster reduction, vowel and consonant substitution, reduplication and deletion of unstressed syllables or single consonants were found. The most common deviation was found to be substitution and the least occurring deviation was reduplication.

Speech development in autism spectrum disorder (ASD) has rarely been studied, yet residual speech sound errors are over 30 times more common in children with ASD than in the general population. Two main theories could explain this. The Social Feedback Loop proposes that toddlers with ASD vocalize less often and so have fewer opportunities to benefit from adult feedback. Thus, fewer vocalizations and perceptible differences in those vocalizations should be found in toddlers with ASD. The Speech Attunement Framework proposes that while toddlers with ASD “tune in” to their native languages well enough to acquire language normally, they lack the ability to “tune up” their articulation to the same level of precision as typically-developing children. Thus, differences in the vocalizations of toddlers with ASD may be perceptible or not, and should exist irrespective of differences in vocalization rate. This study longitudinally examines vocalization rate, consonant inventory size, and voice-onset time (VOT) in syllable-initial bilabial stops using 30-minute speech samples from toddlers in three groups: those at low risk for ASD (LRC), those at high risk for ASD with ASD themselves (HRA+), and those at high risk for ASD without ASD (HRA ) . Transient delays in consonant development were found in both HRA- and HRA+, but only HRA+ toddlers vocalized less often. Further, the relationship between vocalization rate and consonant inventory was significantly different from LRC only for HRA-. VOT development was similar across groups, except that fewer HRA+ 36-month-olds produced distinct /b/ and /p/ populations, as measured by t-test and by Cohen’s d ≥ 0.8 between mean VOTs in the two populations of stops. Results support the Speech Attunement Framework. Consonant acquisition delays are not related to differences in vocalization rate and are not found only in toddlers who develop ASD. The finding of sub-perceptual acoustic differences in stop production in toddlers who develop ASD, with no accompanying differences in production rate, also supports the Speech Attunement Framework. This suggests that the Social Feedback Loop is not diminished in ASD by lower vocalization rate, but that toddlers with ASD may have diminished ability to monitor their own speech.

Considering the diminishing availability of professional resources, increasing costs, and time requirements involved in early childhood mass screenings, parents are an essential source of information. In this study, the Survey of Speech Development (SSD) (Perry-Carson & Steel, 2001; Steel, 2000) was used to determine the accuracy of parents in reporting the speech sound inventories of their toddlers. Parents of 30 children, who were between the ages of 27 to 33 months old, completed the SSD prior to a speech and language assessment session. Based on assessment results, the children were classified as normal developing or language delayed. A 20-minute play interaction between the parent and child was recorded during the assessment and was transcribed later for analysis. Speech sounds (consonants) were coded as present or absent and comparisons were made between the parents results on the SSD and data from the 20-minute speech sample. A point-by-point reliability analysis of the speech sounds on the SSD compared to those produced in the speech sample revealed an overall parental accuracy of 75%. Further, no differences were found between parent reports and transcribed accounts for total number of different consonants. This was true for parents of both language delayed and language normal toddlers. Results suggest that if given a systematic means of providing information, parents are a reliable source of information regarding sounds their toddlers produce.