Quality Of Phonological Representations Research Articles

Specificity of phonological representations in school-age high-functioning ASD children

Purpose: Well-specified phonological representations are important for the development of spoken and written language. This study investigates the types of speech errors and the quality of phonological representations in Greek-speaking school-age children with high-functioning autism spectrum disorder (HF-ASD), as well as the relationship between stored phonological representations and speech output in this sample, according to Stackhouse and Wells’ (1997) model. Method: All participants completed a phonological and a naming test, and a non-word repetition task. A receptive phonological task was administered to a subgroup of HF-ASD and typically developing (TD) participants. According to performance in the phonological test, the HF-ASD children were categorised as ASD with Speech Sound Disorder (SSD) or ASD without SSD. Result: The HF-ASD children made significantly more speech errors and showed significant difficulties in the repetition of non-words and the stored phonological representations compared to the TD group but had the same naming abilities with their TD peers. The ASD children with SSD and without SSD performed alike in the receptive task, indicating that both groups had unspecified phonological representations. Conclusion: These results support the hypothesis of distinct phonological representations for speech input and output and highlight the need of using receptive tasks to evaluate underlying phonological knowledge, a process which could allow clinicians to identify the level of speech breakdown.

Comorbidity Between Math and Reading Problems: Is Phonological Processing a Mutual Factor?

There is a relationship between reading and math skills, as well as comorbidity between reading and math disorders. A mutual foundation for this comorbidity could be that the quality of phonological representations is important for both early reading and arithmetic. In this study, we examine this hypothesis in a sample traced longitudinally from preschool to first grade (N = 259). The results show that phonological awareness does not explain development in arithmetic, but that there is an indirect effect between phoneme awareness in preschool and arithmetic in first grade via phoneme awareness in first grade. This effect is, however, weak and restricted to verbal arithmetic and not arithmetic fluency. This finding is only partly in line with other studies, and a reason could be that this study more strongly controls for confounders and previous skills than other studies.

Does phonological distance impact quality of phonological representations? Evidence from Arabic diglossia.

The study tested the impact of the phonological distance between Spoken Arabic (SpA) and Standard Arabic (StA) on quality of phonological representations among kindergarten, first-, second-, and sixth-grade Arabic-speaking children (N = 120). A pronunciation accuracy judgment task targeted three types of StA words that varied in extent of phonological distance from their form in SpA: (a) identical words, with an identical lexical-phonological form in StA and SpA; (b) cognate words, with partially overlapping phonological forms; items in this category varied in degree of phonological distance too; and (c) unique words with entirely different lexical-phonological forms. Multilevel Regression analysis showed that phonological distance had a significant impact on quality of phonological representations across all grades. Growth in quality of phonological representations was mainly noted between the three younger groups and the sixth-graders. Implications for the impact of phonological distance on phonological representations and on language and literacy development are discussed.

Early language experience and underspecified phonological representations

Taking as a premise that phonological working memory (PWM) influences later language development, in their keynote article, Pierce, Genesee, Delcenserie, and Morgan aim to specify the relations between early language input and the development of PWM in terms of separable influences of timing, quantity, and quality of early language input. We concur that prior work has established that PWM and language development have reciprocal influences on one another during development (e.g., Baddeley, Gathercole, & Papagno, 1998; Gathercole, 2006; Gathercole, Hitch, Service, & Martin, 1997; Metsala & Chisolm, 2010). The goal of the keynote article was to describe how early language experience may influence the development of PWM. Pierce et al. argue that this can be done by comparing the development of PWM across groups of children with differing language experiences during early childhood, specifically (a) delayed exposure to language, (b) impoverished language input, or (c) enriched language input. The authors suggest that this comparison may contribute to establishing that individual differences in PWM are due, in part, to early language experience. Sensitive periods for phonological development that are open roughly in the first year of life are discussed, and it is suggested that the quantity and quality of early language input shapes the quality of phonological representations. Efforts to specify mechanisms by which early language input may influence the development of PWM have both theoretical and, potentially, clinical importance. Considering this, Pierce et al.’s article, which aims to create a platform for future research in terms of the timing, quantity, and quality of early language input, is a valuable contribution.

Considering the (separable) influences of phonological sensitivity and working memory on language learning outcomes

In their keynote article examining links between early experience, phonological working memory, and language outcomes, Pierce, Genessee, Delcenserie, and Morgan (2017) present, what I argue, is a two-pronged hypothesis. In brief, the thesis is that the timing of language exposure and the quality and quantity of language input during an early sensitive period of phonological development shape the quality of phonological representations later used by the phonological working memory system to support short- and long-term language learning. The hypothesis is two-pronged because it hinges on (a) qualitative differences in the development of phonological representations, resulting in (b) variations in the efficiency of working memory as the key constraint on language learning. In this commentary, I examine support for these two prongs in detail.

Cognitive basis of individual differences in speech perception, production and representations: The role of domain general attentional switching.

This study investigated whether individual differences in cognitive functions, attentional abilities in particular, were associated with individual differences in the quality of phonological representations, resulting in variability in speech perception and production. To do so, we took advantage of a tone merging phenomenon in Cantonese, and identified three groups of typically developed speakers who could differentiate the two rising tones (high and low rising) in both perception and production [+Per+Pro], only in perception [+Per-Pro], or in neither modalities [-Per-Pro]. Perception and production were reflected, respectively, by discrimination sensitivity d' and acoustic measures of pitch offset and rise time differences. Components of event-related potential (ERP)-the mismatch negativity (MMN) and the ERPs to amplitude rise time-were taken to reflect the representations of the acoustic cues of tones. Components of attention and working memory in the auditory and visual modalities were assessed with published test batteries. The results show that individual differences in both perception and production are linked to how listeners encode and represent the acoustic cues (pitch contour and rise time) as reflected by ERPs. The present study has advanced our knowledge from previous work by integrating measures of perception, production, attention, and those reflecting quality of representation, to offer a comprehensive account for the underlying cognitive factors of individual differences in speech processing. Particularly, it is proposed that domain-general attentional switching affects the quality of perceptual representations of the acoustic cues, giving rise to individual differences in perception and production.

Effects of Vocabulary and Phonotactic Probability on 2-Year-Olds\u2019 Nonword Repetition

This study investigates the relationship between nonword repetition (NWR) and vocabulary in 2-year-olds. Questions addressed are whether (1) NWR and vocabulary are associated, (2) phonotactic probability affects NWR, and (3) there is an interaction effect between phonotactic probability and vocabulary on NWR performance. The general aim of the study is to investigate whether NWR, as a task of phonological storage, assesses the quality of phonological representations in children as young as 2 years of age. 557 Dutch 2-year-olds performed a NWR task containing items of varying phonotactic probability as well as a receptive vocabulary task. The results showed a moderate, significant correlation between NWR and vocabulary. Phonotactic probability had an effect on NWR performance. Further analyses showed that there was a significant interaction between phonotactic probability and vocabulary for part of the items. These results support previously reported effects of vocabulary and phonotactic probability on NWR in older, English-speaking children for a large sample of Dutch-speaking 2-year-olds, and provide evidence that NWR assesses the quality of phonological representations already in very young children.

Phonological representations in children with SLI

It has been hypothesized that children with specific language impairment (SLI) have difficulty processing sound-based information, including storing and accessing phonological representations in the lexicon. Tasks are emerging in the literature that provide a measure of the quality of stored phonological representations, without requiring a verbal response. This article describes the performance of children with specific language impairment (SLI) ( n = 21), typically developing children matched for age ( n = 21), and typically developing children matched for language ( n = 21) on two measures of phonological representations – the Quality of Phonological Representations (QPR) and the Silent Deletion of Phonemes (SDOP) – and a measure of phonological awareness, the Sutherland Phonological Awareness Test: Revised (SPAT-R). As predicted the age-matched (AM) group demonstrated significantly better performance on all tasks than the SLI group. The AM group performed significantly better than the language-matched (LM) group on the SDOP and SPAT tasks, but not significantly differently on the QPR task. The SLI group performed significantly better than the LM group on both the SDOP and SPAT, but their performance on the QPR was significantly weaker than the LM group. The findings of this study provide support for the notion of lower quality phonological representations in children with SLI thus placing them at increased risk of ongoing language and literacy difficulties.

What Factors Place Children With Speech Sound Disorders at Risk for Reading Problems?

To identify weaknesses in print awareness and phonological processing that place children with speech sound disorders (SSDs) at increased risk for reading difficulties. Language, literacy, and phonological skills of 3 groups of preschool-age children were compared: a group of 68 children with SSDs, a group of 68 peers with normal speech matched on receptive vocabulary, and a group of 68 peers with normal speech and language. The SSD group demonstrated impairments in expressive phonological awareness (ts = 3.45 to 8.17, ps < .001, effect size [ES] = 0.51 to 1.04), receptive phonological awareness (zs = 2.26 to 5.21, ps ≤ .02, ES = 0.39 to 0.79), accessing phonological representations (zs = 3.34 to 5.83, ps < .001, ES = 0.59 to 0.91), quality of phonological representations (zs = 2.35 to 13.11, ps ≤ .02, ES = 0.44 to 1.56), and word reading (ts = 2.48 to 4.42, ps ≤ .01, ES = 0.22 to 0.54). Analyses of covariance found that lower performances of the SSD group on tests of phonological awareness and word reading could be explained by their weaknesses in quality and accessibility of phonological representations. The present study makes a significant theoretical contribution to the literature as the first study, to our knowledge, that has tested the hypothesis that weaknesses in representation-related phonological processing may underlie the difficulties in phonological awareness and reading that are demonstrated by children with SSDs.

Individual differences in pseudohomophony effect relates to auditory categorical perception skills

The study examined whether individual differences in the quality of phonological representations, measured by a categorical perception task (CP), are related with the use of phonological information in a lexical decision pseudohomophone task. In addition, the lexical frequency of the stimuli was manipulated. The sample consisted of Spanish-speaking normal reading adults. When high frequency stimuli were used, CP explained a significant proportion of the variance observed in the pseudohomophone effect. This result supports the idea that, even in normal reading adults, the use of phonological information during lexical access depends on the quality of their phonological representation.

Quality of phonological representations: a window into the lexicon?

There is a great deal of evidence to support the robust relationship between phonological awareness and literacy development. Researchers are beginning to understand the relationship between the accuracy and distinctiveness of stored phonological representations and performance on phonological awareness tasks. However, many of the tasks currently used to assess the integrity of underlying representations are confounded by requiring spoken output. This paper describes the development of the Quality of Phonological Representations (QPR) task, a task that does not require speech output, and its evaluation in the context of a larger study examining predictors of literacy outcomes in Western Australia. The QPR task was given as part of a larger task battery to a cohort of 235 mainstream children in the last term of their Preprimary year (average age = 5;5) and to 179 children at follow-up at the end of Year 2 (average age = 7;9). Normative data for both accuracy and reaction time are presented in percentile tables (appendix B). In their Preprimary year, children were able to identify correct productions of multi-syllabic words (hits) on average 87.5% of the time, rising to an average of 93.8% in Year 2. As expected, children became quicker at making these judgements, reaction time shifting from an average of 1.1 s in Preprimary to 0.83 s in Year 2. A similar pattern was observed with the data for correct rejections. To make these judgements, the children had to identify a pseudo-word as an incorrect pronunciation by 'Katie the computer'. In the Preprimary year, children were able to reject correctly the pseudo-words on average 68.5% of the time, rising to an average of 81.7% in Year 2. As expected, children became quicker at making these judgements, reaction time shortening from an average of 1.4 s in Preprimary to 0.81 s in Year 2. The QPR task was shown to have moderate reliability and concurrent validity. The QPR task appears to be a useful and cost-effective addition to task batteries aiming to identify at-risk children in the early stages of schooling. The ability to profile children's phonological awareness skills and gain insight into their underlying phonological representation skills allows more informed goal setting and intervention planning.

Individual differences in phonological learning and verbal STM span

A relationship between phonological short-term memory tasks (e.g., nonword repetition, digit span) and vocabulary learning in both experimental and real-life conditions has been reported in numerous studies. A mechanism that would explain this correlation is, however, not known. The present study explores the possibility that it is the quality of phonological representations that affects both short-term recall and long-term learning of novel wordlike items. In Experiment 1, groups with relatively good and poor span for pseudowords were established. The good group was found to perform better at explicit memory tasks tapping the incidental learning of a limited stimulus pool used in an auditory immediate serial pseudoword recall task. In Experiment 2, the results of Experiment 1 were replicated when experience of correct recall was controlled. In Experiment 3, the immediate recall performance of the good group was found to benefit more than that of the poor group from syllable repetition within stimulus pools. It is concluded that the efficiency of a process that creates phonological representations is related both to short-term capacity for verbal items, and to long-term phonological learning of the structure of novel phonological items.