Language, gesture, and the developing brain

A developmental perspective on the integration of language production and comprehension

The integration of language production and comprehension processes may be more specific in terms of developmental timing than Pickering & Garrod (P&G) discuss in their target article. Developmental studies do reveal links between production and comprehension, but also demonstrate that the integration of these skills changes over time. Production-comprehension links occur within specific language skills and specific time windows.

Howard W, McCune L, Anderson R. Evidence of a Continuum in Foundational Expressive Communication Skills

Progress monitoring measurement is increasingly needed in early childhood to inform practitioners when an intervention change is needed and as a tool for accomplishing individualization and improving results for individual children. The Early Communication Indicator (ECI) is such a measure for infants and toddlers, 6 to 42 months of age. A greater understanding of the ECI key skills (i.e., gestures, vocalizations, single- and multiple-word utterances) could lead to further improvements in the sensitivity and utility of the decisions made compared to ECIs composite total communication score. Thus, we examined the pattern of growth within and between the ECI's four foundational skills in a large sample of children served in Early Head Start. Results confirmed a unique pattern of growth and change within each skill trajectory in terms of (a) age at skill onset and (b) peaks in each trajectory defining an inflection point or change from acceleration to deceleration. Analyses using these inflection points as intercepts with before and after trajectory slopes in a test of an adjacent skills temporal ordering growth model indicated good fit. Implications of a continuum of foundational ECI skills to future validation and decision making utility of the measure are discussed.

When the body is time: spatial and temporal deixis in children with visual impairments and sighted children

While there is mounting evidence explaining how concrete concepts are processed, the evidence demonstrating how abstract concepts are processed is rather scant. Most research illustrating how concrete and abstract concepts are processed has been obtained from adult populations. Consequently, not much is known about how these concepts are processed by children, especially those with sensorimotor impairments. This paper reports a study in which groups of children who were either visual-motor impaired (VMG), blind (BG), or sighted (CG) were requested to perform deictic gestures for temporal and spatial concepts. The results showed that: (i) spatial pointing was performed faster than temporal pointing across all groups of children; (ii) such difference in pointing times occurred also within groups; and (iii) the slowest pointing times were those of the blind children followed by the VMG and the CG children, respectively. Additionally, while CG children correctly performed the pointing tasks, VMG and, particularly, BG children relied on a form of deixis known as autotopological (or personal) deixis. The results thus suggest that deprivation or lack of sensorimotor experience with the environment affects the processing of abstract concepts and that a compensatory mechanism may be to rely on the body as a reference frame.

Does what you hear predict what you will do and say?

I evaluate the bottlenecks involved in the simulation mechanism underpinning superior predictive abilities for upcoming actions. This perceptual-motor state is characterized by a complex interrelationship designed to make predictions using a highly fine-tuned and constrained motor operation. The extension of such mechanisms to language may occur only in sensorimotor circuits devoted to the action domain.

Motor development and motor resonance difficulties in autism: relevance to early intervention for language and communication skills

Research suggests that a sub-set of children with autism experience notable difficulties and delays in motor skills development, and that a large percentage of children with autism experience deficits in motor resonance. These motor-related deficiencies, which evidence suggests are present from a very early age, are likely to negatively affect social-communicative and language development in this population. Here, we review evidence for delayed, impaired, and atypical motor development in infants and children with autism. We then carefully review and examine the current language and communication-based intervention research that is relevant to motor and motor resonance (i.e., neural "mirroring" mechanisms activated when we observe the actions of others) deficits in children with autism. Finally, we describe research needs and future directions and developments for early interventions aimed at addressing the speech/language and social-communication development difficulties in autism from a motor-related perspective.

Specific aspects of cognitive and language proficiency account for variability in neural indices of semantic and syntactic processing in children

The neural activity mediating language processing in young children is characterized by large individual variability that is likely related in part to individual strengths and weakness across various cognitive abilities. The current study addresses the following question: How does proficiency in specific cognitive and language functions impact neural indices mediating language processing in children? Thirty typically developing seven- and eight-year-olds were divided into high-normal and low-normal proficiency groups based on performance on nonverbal IQ, auditory word recall, and grammatical morphology tests. Event-related brain potentials (ERPs) were elicited by semantic anomalies and phrase structure violations in naturally spoken sentences. The proficiency for each of the specific cognitive and language tasks uniquely contributed to specific aspects (e.g., timing and/or resource allocation) of neural indices underlying semantic (N400) and syntactic (P600) processing. These results suggest that distinct aptitudes within broader domains of cognition and language, even within the normal range, influence the neural signatures of semantic and syntactic processing. Furthermore, the current findings have important implications for the design and interpretation of developmental studies of ERPs indexing language processing, and they highlight the need to take into account cognitive abilities both within and outside the classic language domain.

The changing role of gesture in linguistic development: a developmental trajectory and a cross-cultural comparison between British and Finnish children

We studied how gesture use changes with culture, age and increased spoken language competence. A picture-naming task was presented to British (N = 80) and Finnish (N = 41) typically developing children aged 2-5 years. British children were found to gesture more than Finnish children and, in both cultures, gesture production decreased after the age of two. Two-year-olds used more deictic than iconic gestures than older children, and gestured more before the onset of speech, rather than simultaneously or after speech. The British 3- and 5-year-olds gestured significantly more when naming praxic (manipulable) items than non-praxic items. Our results support the view that gesture serves a communicative and intrapersonal function, and the relative function may change with age. Speech and language therapists and psychologists observe the development of children's gestures and make predictions on the basis of their frequency and type. To prevent drawing erroneous conclusions about children's linguistic development, it is important to understand developmental and cultural variations in gesture use.

Frontal and temporal contributions to understanding the iconic co-speech gestures that accompany speech

In everyday conversation, listeners often rely on a speaker's gestures to clarify any ambiguities in the verbal message. Using fMRI during naturalistic story comprehension, we examined which brain regions in the listener are sensitive to speakers' iconic gestures. We focused on iconic gestures that contribute information not found in the speaker's talk, compared with those that convey information redundant with the speaker's talk. We found that three regions-left inferior frontal gyrus triangular (IFGTr) and opercular (IFGOp) portions, and left posterior middle temporal gyrus (MTGp)--responded more strongly when gestures added information to nonspecific language, compared with when they conveyed the same information in more specific language; in other words, when gesture disambiguated speech as opposed to reinforced it. An increased BOLD response was not found in these regions when the nonspecific language was produced without gesture, suggesting that IFGTr, IFGOp, and MTGp are involved in integrating semantic information across gesture and speech. In addition, we found that activity in the posterior superior temporal sulcus (STSp), previously thought to be involved in gesture-speech integration, was not sensitive to the gesture-speech relation. Together, these findings clarify the neurobiology of gesture-speech integration and contribute to an emerging picture of how listeners glean meaning from gestures that accompany speech.

Action imitation at 1½ years is better than pointing gesture in predicting late development of language production at 3 years of age

This study examined whether poor pointing gestures and imitative actions at 18 months of age uniquely predicted late language production at 36 months, beyond the role of poor language at 18 months of age. Data from the Norwegian Mother and Child Cohort Study were utilized. Maternal reports of the children's nonverbal skills and language were gathered for 42,517 children aged 18 months and for 28,107 of the same children at 36 months. Panel analysis of latent variables revealed that imitative actions, language comprehension, and language production uniquely contributed to predicting late development of language production, while pointing gestures did not. It is suggested that the results can be explained by underlying symbolic representational skills at 18 months.

Assessing lexicon: validation and developmental data of the Picture Naming Game (PiNG), a new picture naming task for toddlers

BACKGROUND

Understanding lexical abilities in infants and toddlers is important, yet no single tool can be used.

AIMS

To perform a validation of a new tool (known as the Picture Naming Game, or 'PiNG') for assessing lexical comprehension and production in toddlers and to obtain developmental trends for Italian children.

METHODS & PROCEDURES

PiNG consists of four subtests: Noun Comprehension (NC), Noun Production (NP), Predicate Comprehension (PC) and Predicate Production (PP), each containing 20 lexical targets. It was administered to 388 children with typical development aged 19-37 months. The short form of the Italian version of the MacArthur-Bates Communicative Development Inventories (MB-CDI), previously completed by parents of participants, was used for the validation of PiNG.

OUTCOMES & RESULTS

For the validation study, reliability, internal consistency and concurrent validity were analysed. The reliability was optimal for NC, NP and PP, and satisfactory for PC. Split-half analysis showed a fair internal consistency for all of the subtests. Concurrent validity was verified through the correlation with MB-CDI using Pearson's correlation coefficient, which was significant even after having controlled for age. To describe the developmental trends, data are provided for 1-month age intervals. The comprehension subtests showed a rapid increase at younger ages, with children reaching a plateau slightly earlier for the NC (at 30 months versus 33 months for the PC). The increase in the production subtests was gradual; PP appeared to be the most difficult subtest, administrable starting at the age of 24 months. When we analysed, as potential confounders for developmental trends, gender, parents' educational level, and the way in which the subtests were administered, no differences were found, except for a better performance for girls in the NP subtest.

CONCLUSIONS & IMPLICATIONS

Overall, the results suggest that PiNG is suitable for children in the age range considered to evaluate language abilities. It can be used together with other tools with clinical and theoretical objectives also to describe lexical abilities in atypical populations, such as children with cognitive and/or language impairment, as well as with late-talking children. Finally, the four subtests can be administered separately or combined, which provides flexibility in clinical use, in that the individual child's linguistic and/or cognitive characteristics and level can be taken into consideration.

Gestural development and its relation to language acquisition in very preterm children

This longitudinal study examined the development of communicative gesture in 16 preterm children and two groups of full term children at 12, 18 and 24 months of age. Children's spontaneous communicative gestures were analyzed during mother-child observation sessions. Preterm children's motor, mental and linguistic development were also measured. The development of gestural communication did not significantly differ between the groups except for the use of gesture-plus-word combinations at 18 and 24 months, when full term children produced significantly more combinations than preterm children. For preterm children, the production of pointing at 12 months was positively associated with lexical skills at 24 months as was the use of gestures-plus-word utterances at 18 months with morphosyntactic skills at 24 months. Our analyses also revealed a subgroup of preterm children characterized by a low birth-weight and mental scores who demonstrated an enduring increase in communicative gesture production over time. This profile could be associated with later delays in language acquisition.

Early vocabulary and gestures in Estonian children

Parents of 592 children between the age of 0 ; 8 and 1 ; 4 completed the Estonian adaptation of the MacArthur-Bates Communicative Development Inventory (ECDI Infant Form). The relationships between comprehension and production of different categories of words and gestures were examined. According to the results of regression modelling the production of object gestures and gestural routines was positively correlated with the use of all the word categories. Comprehension of common nouns was positively correlated to the production of common nouns and predicates, whereas the comprehension of predicates was negatively correlated to the production of common nouns and social terms. The older the children were the more they produced words from each category. Girls were reported to produce more social terms. First-born children had an advantage over later-born children in the production of common nouns. Maternal educational level was associated with the production of common nouns and predicates.

Exploring the Relationship Between Gesture and Language in ASD

In this paper, we will explore the relationship between gesture and language in autism spectrum disorders (ASD). Gesture and speech have been shown to share the same neural substrates, and it has been proposed that speech evolved over time from a gestural repertoire. Simultaneously, research in gesture and language has shown that gesture plays a critical role in language development, and a gestural disturbance may be a predictor of future language development. Individuals with autism often present with imitation deficits, developmental dyspraxia, and deficits in motor coordination. Taken together, these deficits pose challenges to the speech-language pathologist providing therapy to these clients. If gesture is indeed critical to language development, and individuals with ASD demonstrate gestural deficits, new therapies are needed to bridge this gap. We will describe an innovative battery of tasks assessing gesture and discuss future gestural intervention.

Development of the communication complexity scale

PURPOSE

Accurate description of an individual's communication status is critical in both research and practice. Describing the communication status of individuals with severe intellectual and developmental disabilities is difficult because these individuals often communicate with presymbolic means that may not be readily recognized. Our goal was to design a communication scale and summary score for interpretation that could be applied across populations of children and adults with limited (often presymbolic) communication forms.

METHOD

The Communication Complexity Scale (CCS) was developed by a team of researchers and tested with 178 participants with varying levels of presymbolic and early symbolic communication skills. Correlations between standardized and informant measures were completed, and expert opinions were obtained regarding the CCS.

RESULTS

CCS scores were within expected ranges for the populations studied, and interrater reliability was high. Comparison across other measures indicated significant correlations with standardized tests of language. Scores on informant report measures tended to place children at higher levels of communication. Expert opinions generally favored the development of the CCS.

CONCLUSIONS

The scale appears to be useful for describing a given individual's level of presymbolic or early symbolic communication. Further research is needed to determine whether it is sensitive to developmental growth in communication.

Language development after cochlear implantation: an epigenetic model

Growing evidence supports the notion that dynamic gene expression, subject to epigenetic control, organizes multiple influences to enable a child to learn to listen and to talk. Here, we review neurobiological and genetic influences on spoken language development in the context of results of a longitudinal trial of cochlear implantation of young children with severe to profound sensorineural hearing loss in the Childhood Development after Cochlear Implantation study. We specifically examine the results of cochlear implantation in participants who were congenitally deaf (N = 116). Prior to intervention, these participants were subject to naturally imposed constraints in sensory (acoustic-phonologic) inputs during critical phases of development when spoken language skills are typically achieved rapidly. Their candidacy for a cochlear implant was prompted by delays (n = 20) or an essential absence of spoken language acquisition (n = 96). Observations thus present an opportunity to evaluate the impact of factors that influence the emergence of spoken language, particularly in the context of hearing restoration in sensitive periods for language acquisition. Outcomes demonstrate considerable variation in spoken language learning, although significant advantages exist for the congenitally deaf children implanted prior to 18 months of age. While age at implantation carries high predictive value in forecasting performance on measures of spoken language, several factors show significant association, particularly those related to parent-child interactions. Importantly, the significance of environmental variables in their predictive value for language development varies with age at implantation. These observations are considered in the context of an epigenetic model in which dynamic genomic expression can modulate aspects of auditory learning, offering insights into factors that can influence a child's acquisition of spoken language after cochlear implantation. Increased understanding of these interactions could lead to targeted interventions that interact with the epigenome to influence language outcomes with intervention, particularly in periods in which development is subject to time-sensitive experience.

Gesture in the developing brain

Speakers convey meaning not only through words, but also through gestures. Although children are exposed to co-speech gestures from birth, we do not know how the developing brain comes to connect meaning conveyed in gesture with speech. We used functional magnetic resonance imaging (fMRI) to address this question and scanned 8- to 11-year-old children and adults listening to stories accompanied by hand movements, either meaningful co-speech gestures or meaningless self-adaptors. When listening to stories accompanied by both types of hand movement, both children and adults recruited inferior frontal, inferior parietal, and posterior temporal brain regions known to be involved in processing language not accompanied by hand movements. There were, however, age-related differences in activity in posterior superior temporal sulcus (STSp), inferior frontal gyrus, pars triangularis (IFGTr), and posterior middle temporal gyrus (MTGp) regions previously implicated in processing gesture. Both children and adults showed sensitivity to the meaning of hand movements in IFGTr and MTGp, but in different ways. Finally, we found that hand movement meaning modulates interactions between STSp and other posterior temporal and inferior parietal regions for adults, but not for children. These results shed light on the developing neural substrate for understanding meaning contributed by co-speech gesture.

Intention Processing in Communication: A Common Brain Network for Language and Gestures

Human communicative competence is based on the ability to process a specific class of mental states, namely, communicative intention. The present fMRI study aims to analyze whether intention processing in communication is affected by the expressive means through which a communicative intention is conveyed, that is, the linguistic or extralinguistic gestural means. Combined factorial and conjunction analyses were used to test two sets of predictions: first, that a common brain network is recruited for the comprehension of communicative intentions independently of the modality through which they are conveyed; second, that additional brain areas are specifically recruited depending on the communicative modality used, reflecting distinct sensorimotor gateways. Our results clearly showed that a common neural network is engaged in communicative intention processing independently of the modality used. This network includes the precuneus, the left and right posterior STS and TPJ, and the medial pFC. Additional brain areas outside those involved in intention processing are specifically engaged by the particular communicative modality, that is, a peri-sylvian language network for the linguistic modality and a sensorimotor network for the extralinguistic modality. Thus, common representation of communicative intention may be accessed by modality-specific gateways, which are distinct for linguistic versus extralinguistic expressive means. Taken together, our results indicate that the information acquired by different communicative modalities is equivalent from a mental processing standpoint, in particular, at the point at which the actor's communicative intention has to be reconstructed.

Handedness for grasping objects and declarative pointing: a longitudinal study

It is still unclear whether infants become right-handed because of their left-hemisphere specialization for language (through gestural communication for instance), whether they speak predominantly with their left hemisphere because of this hemisphere's superiority in controlling sequential actions which first results in right-handedness, or whether the two lateralization processes develop independently. To tackle this question, we followed 26 human infants from 8 to 20 months to evaluate the temporal relationship between the emergence of hand preference for grasping objects and for declarative pointing (communicative gesture). Our results show that when grasping and pointing are compared in similar conditions, with objects presented in several spatial positions, the tendency to use the right hand is significantly larger for pointing than for grasping, and both hand preferences are loosely correlated. This suggests that, at least at the age studied here, hand preferences for grasping and for declarative pointing develop relatively independently.

Gesture and motor skill in relation to language in children with language impairment

PURPOSE

To examine gesture and motor abilities in relation to language in children with language impairment (LI).

METHOD

Eleven children with LI (aged 2;7 to 6;1 [years;months]) and 16 typically developing (TD) children of similar chronological ages completed 2 picture narration tasks, and their language (rate of verbal utterances, mean length of utterance, and number of different words) and gestures (coded for type, co-occurrence with language, and informational relationship to language) were examined. Fine and gross motor items from the Battelle Developmental Screening Inventory (J. Newborg, J. R. Stock, L. Wneck, J. Guidubaldi, & J. Suinick, 1994) and the Child Development Inventory (H. R. Ireton, 1992) were administered.

RESULTS

Relative to TD peers, children with LI used gestures at a higher rate and produced greater proportions of gesture-only communications, conventional gestures, and gestures that added unique information to co-occurring language. However, they performed more poorly on measures of fine and gross motor abilities. Regression analyses indicated that within the LI but not the TD group, poorer expressive language was related to more frequent gesture production.

CONCLUSIONS

When language is impaired, difficulties are also apparent in motor abilities, but gesture assumes a compensatory role. These findings underscore the utility of including spontaneous gesture and motor abilities in clinical assessment of and intervention for preschool children with language concerns.

Expressive language and cognitive development: diversity and complexity of children's productions

BACKGROUND

Objective and systematized analysis of cognitive and expressive language development.

AIM

To characterize expressive language and cognitive development considering the diversity and complexity of children's productions.

METHOD

This study involved 20 subjects (10 male and 10 female), who were adequate for gestational age and birth weight and had no pre, peri or post natal intercurrences. Participants were submitted to 30-minute sessions, once a month, for the observation of expressive language and cognitive development. The observations were made during the period that went from eight to 18 months of age, using the material and application procedures suggested by the PELCDO-r.

RESULTS

The amount of different schemes, gestures and verbalizations that children were capable of producing (diversity and complexity) are presented and analyzed considering each one of the 30-minute sessions as well as the overall total during the period of observation (from eight to 18 months).

CONCLUSION

The PELCDO-r allowed the characterization of expressive language and cognitive development by means of the objective observation of this process concerning the diversity and complexity of subjects' productions, considering the period between the fourth phase of sensorimotor stage and the beginning of preoperational stage.

Environmental Influences on Joint Attention in Great Apes: Implications for Human Cognition

In humans, cultural differences in advanced social cognition have been well demonstrated. In tasks pertaining to theory of mind, for instance, individuals pass standard assessments of false-belief understanding at substantially different ages in different cultural environments. Less well-studied are more basic sociocognitive capacities, such as joint attention, which are held by many to constitute the foundational skill set for advanced sociocognitive reasoning. Here, we review the striking group differences in joint attention displayed by great apes as a consequence of being raised in different cultural environments, including wild habitats, institutional settings such as zoos and biomedical research centers, and home-rearing or language-training settings. Like humans, apes develop tactics for joint attention that are adaptive to the particular environments of their early rearing experiences. Great apes serve as animal models for environmental influences on sociocognitive capacities in our own species.

Individual differences in language development: relationship with motor skill at 21 months

Language development has long been associated with motor development, particularly manual gesture. We examined a variety of motor abilities - manual gesture including symbolic, meaningless and sequential memory, oral motor control, gross and fine motor control - in 129 children aged 21 months. Language abilities were assessed and cognitive and socio-economic measures controlled for. Oral motor control was strongly associated with language production (vocabulary and sentence complexity), with some contribution from symbolic abilities. Language comprehension, however, was associated with cognitive and socio-economic measures. We conclude that symbolic, working memory, and mirror neuron accounts of language-motor control links are limited, but that a common neural and motor substrate for nonverbal and verbal oral movements may drive the motor-language association.

Narrative skill in children with early unilateral brain injury: a possible limit to functional plasticity

Children with pre- or perinatal brain injury (PL) exhibit marked plasticity for language learning. Previous work has focused mostly on the emergence of earlier-developing skills, such as vocabulary and syntax. Here we ask whether this plasticity for earlier-developing aspects of language extends to more complex, later-developing language functions by examining the narrative production of children with PL. Using an elicitation technique that involves asking children to create stories de novo in response to a story stem, we collected narratives from 11 children with PL and 20 typically developing (TD) children. Narratives were analysed for length, diversity of the vocabulary used, use of complex syntax, complexity of the macro-level narrative structure and use of narrative evaluation. Children's language performance on vocabulary and syntax tasks outside the narrative context was also measured. Findings show that children with PL produced shorter stories, used less diverse vocabulary, produced structurally less complex stories at the macro-level, and made fewer inferences regarding the cognitive states of the story characters. These differences in the narrative task emerged even though children with PL did not differ from TD children on vocabulary and syntax tasks outside the narrative context. Thus, findings suggest that there may be limitations to the plasticity for language functions displayed by children with PL, and that these limitations may be most apparent in complex, decontextualized language tasks such as narrative production.

Early gesture predicts language delay in children with pre- or perinatal brain lesions

Does early gesture use predict later productive and receptive vocabulary in children with pre- or perinatal unilateral brain lesions (PL)? Eleven Children with PL were categorized into 2 groups based on whether their gesture at 18 months was within or below the range of typically developing (TD) children. Children with PL whose gesture was within the TD range developed a productive vocabulary at 22 and 26 months and a receptive vocabulary at 30 months that were all within the TD range. In contrast, children with PL below the TD range did not. Gesture was thus an early marker of which children with early unilateral lesions would eventually experience language delay, suggesting that gesture is a promising diagnostic tool for persistent delay.

Language abilities and gestural communication in a girl with bilateral perisylvian syndrome: a clinical and rehabilitative follow-up

We present the neuropsychological and linguistic follow-up of a girl with bilateral perisylvian polymicrogyria during 4 years of gestural and verbal speech therapy. Some researchers have suggested that children with bilateral perisylvian polymicrogyria mentally fail to reach the syntactic phase and do not acquire a productive morphology. This patient achieved a mean length of utterance in signs/gestures of 3.4, a syntactic phase of completion of the nuclear sentence and the use of morphological modifications. We discuss the link between gesture and language and formulate hypotheses on the role of gestural input on the reorganization of compensatory synaptic circuits.

Three profiles of language abilities in toddlers with an expressive vocabulary delay: variations on a theme

PURPOSE

The presence of an expressive vocabulary delay (EVD) in the context of otherwise harmonious development has been the main criterion used to define language delay in 2-year-olds. To better understand the communicative functioning of these children, other variables must be considered. In this study, the aim was to delineate and characterize clusters of 2-year-olds with EVD by measuring other language variables in these children.

METHOD

Language and related variables were measured in 68 francophone children with EVD.

RESULTS

In a cluster analysis, 2 language variables--(a) language expression and engagement in communication and (b) language comprehension--yielded 3 clusters ranging from weak language ability to high scores on both variables. Further differences were found between these clusters with regard to 2 correlates of lexical acquisition--namely, size of the expressive vocabulary and cognitive development.

CONCLUSION

These results shed new light on the notion of heterogeneity in toddlers who present with an EVD by proposing subgroups among them. A follow-up investigation of these participants is ongoing.

Language delay in severely neglected children: a cumulative or specific effect of risk factors?

OBJECTIVES

This research sought to determine if the language delay (LD) of severely neglected children under 3 years old was better explained by a cumulative risk model or by the specificity of risk factors. The objective was also to identify the risk factors with the strongest impact on LD among various biological, psychological, and environmental factors.

METHODS

Sixty-eight severely neglected children and their mothers participated in this cross-sectional study. Children were between 2 and 36 months of age. Data included information about the child's language development and biological, psychological, and environmental risk factors.

RESULTS

Prevalence of LD is significantly higher in this subgroup of children than in the population as a whole. Although we observed that the risk of LD significantly increased with an increase in the cumulative count of the presence of the child's biological-psychological risk factors, the one-by-one analysis of the individual factors revealed that the cumulative effect mainly reflected the specific impact of the child's cognitive development. When we considered also the environmental risk factors, multivariate logistic regression established that cognitive development, the mother's own physical and emotional abuse experience as a child, and the mother's low acceptability level towards her child are linked to LD in severely neglected children.

CONCLUSIONS

Language development is the result of a complex interaction between risk factors. LD in severely neglected children is better explained by the specificity of risk factors than by the cumulative risk model.

PRACTICE IMPLICATIONS

Most prevention and early intervention programs promote and target an increase in the quantity and quality of language stimulation offered to the child. Our results suggest that particular attention should be given to other environmental factors, specifically the mother's psychological availability and her sensitivity towards the child. It is essential to suggest interventions targeting various ecological dimensions of neglectful mothers to help break the intergenerational neglect transmission cycle. It is also important to develop government policies and ensure that efforts among the various response networks are concerted since in-depth changes to neglect situations can only come about when all interested parties become involved.

Gesture discrimination in primary progressive aphasia: the intersection between gesture and language processing pathways

The issue of the relationship between language and gesture processing and the partial overlap of their neural representations is of fundamental importance to neurology, psychology, and social sciences. Patients suffering from primary progressive aphasia, a clinical syndrome characterized by comparatively isolated language deficits, may provide direct evidence for anatomical and functional association between specific language deficits and gesture discrimination deficits. A consecutive series of 16 patients with primary progressive aphasia and 16 matched control subjects participated. Our nonverbal gesture discrimination task consisted of 19 trials. In each trial, participants observed three video clips showing the same gesture performed correctly in one clip and incorrectly in the other two. Subjects had to indicate which of the three versions was correct. Language and gesture production were evaluated by means of conventional tasks. All participants underwent high-resolution structural and diffusion tensor magnetic resonance imaging. Ten of the primary progressive aphasia patients showed a significant deficit on the nonverbal gesture discrimination task. A factor analysis revealed that this deficit clustered with gesture imitation, word and pseudoword repetition, and writing-to-dictation. Individual scores on this cluster correlated with volume in the left anterior inferior parietal cortex extending into the posterior superior temporal gyrus. Probabilistic tractography indicated this region comprised the cortical relay station of the indirect pathway connecting the inferior frontal gyrus and the superior temporal cortex. Thus, the left perisylvian temporoparietal area may underpin verbal imitative behavior, gesture imitation, and gesture discrimination indicative of a partly shared neural substrate for language and gesture resonance.

Relationships between early gestures and later language in children with fragile X syndrome

PURPOSE

The authors hypothesized that significant positive relationships would exist between early gesture use and later language attainments in children with fragile X syndrome (FXS), as has been reported in studies with other populations.

METHOD

Participants were young children with FXS and limited expressive language (21 boys, 4 girls), divided into 2 subgroups based on the Childhood Autism Rating Scale (CARS; Schopler, Reichler, & Renner, 1988) scores. Data were collected when participants were about 2 years of age and again when they were about 5 years of age. Communication was assessed through the analysis of video samples obtained in the children's homes for both observation periods. Correlational analyses were completed between early prelinguistic communication and later verbal communication scores for all participants and for children with high (>30) versus low (<30) scores on the CARS.

RESULTS

Although no significant relationships were found between prelinguistic gesture use and language outcomes for the group of children as a whole, significant negative correlations were found for the group of children who had high CARS scores.

CONCLUSIONS

These outcomes did not support the authors' initial hypotheses. It was concluded that extensive use of developmentally early gestures by children with FXS who also have many symptoms of autism may not be a positive indicator of later language.

Integrating Speech and Iconic Gestures in a Stroop-like Task: Evidence for Automatic Processing

Previous research has demonstrated a link between language and action in the brain. The present study investigates the strength of this neural relationship by focusing on a potential interface between the two systems: cospeech iconic gesture. Participants performed a Stroop-like task in which they watched videos of a man and a woman speaking and gesturing about common actions. The videos differed as to whether the gender of the speaker and gesturer was the same or different and whether the content of the speech and gesture was congruent or incongruent. The task was to identify whether a man or a woman produced the spoken portion of the videos while accuracy rates, RTs, and ERPs were recorded to the words. Although not relevant to the task, participants paid attention to the semantic relationship between the speech and the gesture, producing a larger N400 to words accompanied by incongruent versus congruent gestures. In addition, RTs were slower to incongruent versus congruent gesture–speech stimuli, but this effect was greater when the gender of the gesturer and speaker was the same versus different. These results suggest that the integration of gesture and speech during language comprehension is automatic but also under some degree of neurocognitive control.

Developing language in a developing body: the relationship between motor development and language development

ABSTRACTDuring the first eighteen months of life, infants acquire and refine a whole set of new motor skills that significantly change the ways in which the body moves in and interacts with the environment. In this review article, I argue that motor acquisitions provide infants with an opportunity to practice skills relevant to language acquisition before they are needed for that purpose; and that the emergence of new motor skills changes infants' experience with objects and people in ways that are relevant for both general communicative development and the acquisition of language. Implications of this perspective for current views of co-occurring language and motor impairments and for methodology in the field of child language research are also considered.