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PubMed2006

Association between differentiated processing of syllables and comprehension of grammatical morphology in children with Down syndrome.

Our purpose in this exploratory investigation was to examine the relationship between degree of impairment in grammatical morpheme comprehension and event-related potential measures of differentiated processing of speech syllables in 10 children with Down syndrome. Results strongly support the hypothesized association. Graphs of the association indicate that children with less impaired grammatical comprehension had greater amplitude differences in event-related potentials to contrast of syllables within preselected poststimulus latency ranges. The theoretical and clinical ramifications of these results are discussed.

Cerebral Cortex↗
PubMed1992

Infant information processing in relation to six-year cognitive outcomes.

As part of a longitudinal follow-up of full-terms and preterms, infant measures of information processing obtained at 7 months and 1 year were related to various 6-year outcomes: general intelligence, language proficiency, early reading and quantitative skills, and several facets of perceptual organization (N = 91). 7-month Visual recognition memory (VRM) was associated with 6-year performance in all domains, and 3 1-year measures--VRM, cross-modal transfer (CMT), and object permanence--were related to IQ and/or one or more specific outcomes (r's = .20 to .47). Many of the infant-childhood relations remain significant even with IQ partialed. Additionally, 7-month VRM and 1-year CMT scores were lower for infants who, at 6 years, were considered at risk for learning disabilities. Overall, measures from the first year of life predicted both specific cognitive abilities and IQ at 6 years; to some extent, the specific abilities were predicted independently of IQ.

Achievement↗
PubMed1989

Familial aggregation in specific language impairment.

Self-report data from the families of children participating in the San Diego Longitudinal Study of specific developmental language impairment were used to assess familial aggregation in the disorder. Families of impaired children reported higher rates of affected first-degree relatives than did families of matched controls. Significantly higher incidence of maternal and paternal childhood language and/or learning disabilities, as well as sibling disability rates, were reported. The extent to which familial aggregation reflects genetic or environmental influences in specific language disorders remains to be determined.

Adult↗
PubMed2004

Determination of language dominance with synthetic aperture magnetometry: comparison with the Wada test.

Cerebral dominance for language function was investigated with synthetic aperture magnetometry (SAM). The results were compared with those of the Wada test. SAM is a spatial filtering technique that enables demonstration of the spatiotemporal distribution of oscillatory changes (synchronization and desynchronization) in magnetoencephalography (MEG) signals elicited by specific brain activation. MEG was conducted during a silent reading task in 20 consecutive preoperative neurosurgical patients who also underwent a Wada test. The spatial distribution of oscillatory changes related to silent reading was shown tomographically with SAM as statistical images. Language dominance was estimated by the laterality index, which scales the lateralization of the beta (13-25 Hz) and low gamma (25-50 Hz) band desynchronizations in the inferior frontal gyrus (IFG) or middle frontal gyrus (MFG). Oscillatory changes were distributed multifocally and bilaterally in the occipital cortex, IFG or MFG, and temporo-parieto-occipital border regions. In 19 patients (95%), language lateralization estimated by the laterality index was congruent with the result of the Wada test. In left-handed patients, SAM analysis clearly differentiated language dominance (left, right, or bilateral), and the findings were confirmed by the Wada test. Lateralization of beta or low gamma band desynchronizations in the IFG or MFG is a good indicator of the side of language dominance. Reliability of MEG imaging with SAM is sufficient to evaluate language dominance preoperatively in neurosurgical patients.

Adolescent↗
PubMed1991

Otitis media in early childhood and later language.

The relationship between early otitis media with effusion (OME) experience and later language development was examined in a prospective cohort study of 30 children from middle-class families and 33 children from low-income families. Ear status was monitored using otoscopy and tympanometry during wellness and illness periods between birth and 3 years of age. Language was assessed using standardized tests and a language sample between 4 1/2 and 6 years. Findings suggested no reliable relationship between early OME experience and later language development.

Child, Preschool↗
PubMed2001

Predictors and correlates of adaptive functioning in children with developmental disorders.

Autism is a developmental disorder marked by impairments in socialization, communication, and perseverative behavior and is associated with cognitive impairment and deficits in adaptive functioning. Research has consistently demonstrated that children with autism have deficits in adaptive functioning more severe than their cognitive deficits. This study investigates the correlates and predictors of adaptive functioning as measured by the Vineland Adaptive Behavior Scales in high- and low-functioning children with autism and their age and nonverbal IQ matched controls. Thirty-five 9-year-old children with high-functioning autism (HAD) were compared with 31 age-matched children with developmental language disorder (DLD), and 40 9-year-old children with low-functioning autism (LAD) were compared with 17 age-matched children with low IQ on adaptive functioning, IQ, autistic symptomology, and tests of language and verbal memory. Results indicate that both groups with autism were significantly impaired compared to their matched controls on Socialization and Daily Living, but not Communication and that these impairments were more pronounced in the HAD group than in the LAD group. Adaptive behavior was strongly correlated with autistic symptomology only in the HAD group. Regression analyses indicated that IQ was strongly predictive of adaptive behavior in both low-functioning groups, but tests of language and verbal memory predicted adaptive behavior in the higher functioning groups. Results suggest that IQ may act as a limiting factor for lower functioning children but higher functioning children are impaired by specific deficits, including autistic symptomology and impaired language and verbal memory.

Adaptation, Psychological↗
PubMed2004

The development of complex sentence interpretation in typically developing children compared with children with specific language impairments or early unilateral focal lesions.

This study compared sentence comprehension skills in typically developing children 5-17 years of age, children with language impairment (LI) and children with focal brain injuries (FL) acquired in the pre/perinatal period. Participants were asked to process sentences 'on-line', choosing the agent in sentences that varied in syntactic complexity (actives, passives, subject clefts and object clefts), and in the presence or absence of a subject-verb agreement contrast. Results revealed that accuracy and processing speeds vary with syntactic complexity in all groups, reflecting the frequency and regularity of sentence types. Developmental changes continued throughout childhood, as children became faster and more accurate at processing more complex sentence structures. Children with LI and children with FL were quite profoundly delayed, displaying profiles similar to, or more impaired than those of younger children, but there was no evidence in the FL group for a disadvantage in left- vs. right-hemisphere-damaged children. Children with LI showed one unique pattern: higher than normal costs (reflected in reaction times) in using converging information from subject-verb agreement, in line with studies suggesting special vulnerabilities in grammatical morphology in this group. Results are discussed in terms of the Competition Model, a theory of language processing designed to account for the statistical changes in performance that are observed during development, and the probabilistic deficits in children with language impairments.

Adolescent↗
PubMed2004

Language development in children at risk for language impairment: cross-population comparisons.

At 3 years of age the spontaneous language of 17 typically developing children was compared to two groups of toddlers who were at risk for language delay for very different reasons. One at-risk group, late talkers, appeared normal in all respects except for their delayed language. These 20 children scored at or below the fifteenth percentile for expressive vocabulary on the MacArthur Communicative Development Inventory (Fenson et al., 1993) when originally identified at 20-27 months of age and within the normal range on the Bayley Scales of Infant Development (Bayley, 1969). The other group, 21 children with unilateral focal brain injury, suffered localized damage to their brain prenatally, perinatally, or within the first 6 months of life. Results indicated that both of the at-risk groups were still significantly lower in vocabulary diversity and grammar at 3 years of age. There was also significantly greater variability in the at-risk groups than in the control groups, and in the children with focal brain injury than in the late talkers in both areas. The importance of language comprehension to development in this period was supported by two findings. First, children with focal brain injury had significantly lower scores than late talkers on the Index of Productive Syntax, a test of emerging grammar, and had been lower in comprehension on a standardized test of language comprehension a year earlier. Second, late talkers with delay in comprehension as well as production had significantly lower scores on IPSyn than those with normal comprehension, suggesting that they are at greater risk for continued delay. Qualitative analyses indicated that the at-risk groups produced the same kinds of errors, but that late talkers produced a substantially greater proportion of errors in obligatory contexts than did children with focal brain injury.

Brain Injuries↗
PubMed1994

Strategies for achieving cultural equivalence.

The strategy used by a bicultural research team of Anglos and Mexican Americans to develop cultural equivalence in a cross-cultural study of family caregiving is described. Five sequential stages designed to address Berry's (1969) criteria for cross-cultural research (functional equivalence, a comparative descriptive framework, and language equivalence) are described, including (a) start-up, (b) preparation, (c) pilot testing for language equivalence, (d) pilot testing for operational equivalence, and (e) reevaluation.

Caregivers↗
PubMed1998

Regional cerebral blood flow and language dominance: SPECT during intracarotid amobarbital testing.

We examined the relation between language dominance and regional cerebral blood flow (rCBF) during the intracarotid amobarbital procedure (IAP). A previous report limited to three patients suggested that dominant rather than nondominant hemisphere IAP may have a differential effect on rCBF. Behavioral assessment during the IAP also suggests that dominant hemisphere injection results in a differential effect on memory and affective symptoms rather than nondominant injection. Thirteen patients were assessed using single-photon emission CT (SPECT) brain imaging during both left and right IAP. The SPECTs were coregistered with the individual's MRI. Changes in rCBF during each IAP were compared with the patient's baseline SPECT. Nine patients had left hemisphere dominance, two were right dominant, and two had bilateral speech representation. In the left dominant subjects, left-hemisphere injection had a consistently greater effect on rCBF than right-hemisphere injection in the anterior (p < 0.005) and posterior (p < 0.01) temporal neocortex. There was also a trend for greater hypoperfusion in the frontal lobe of the left hemisphere. rCBF in the ipsilateral hippocampus was not significantly different after each injection (p > 0.05). In the two patients with right hemisphere speech, the reverse pattern was seen, with greater hypoperfusion after right (dominant) hemisphere injection. There was no consistent asymmetry in the two patients with bilateral speech. Dominant hemisphere IAP results in significantly greater hypoperfusion than does nondominant injection. These data provide a physiologic basis for behavioral differences noted after dominant versus nondominant IAP.

Adolescent↗
PubMed1994

The CAT/CLAMS assessment for early intervention services. Clinical Adaptive Test/Clinical Linguistic and Auditory Milestone Scale.

The Clinical Adaptive Test/Clinical Linguistic and Auditory Milestone Scale (CAT/CLAMS) is a relatively new test of language, problem-solving abilities, and visual-motor skills for children ages 0 to 36 months of age. This instrument was compared to the Bayley Mental Developmental Index (MDI), the generally accepted standard of infant developmental tests. This study evaluates 328 normal children tested in infancy and then at 18 and 30 months of age. Specificity was excellent (95% to 100%) at both 18- and 30-month levels when compared to the Bayley MDI. Sensitivity, however, was 21% at the 18-month level and 67% at the 30-month level. Predictive validity (.65) and within-test validity (.69) are good. The CAT/CLAMS compares favorably with the Bayley MDI assessment of children between 18 and 30 months of age and can be used for clinical assessment of toddlers referred for development assessment prior to admission to early intervention programs.

Animals↗
PubMed2000

The Thai version of Aachen aphasia test (THAI-AAT).

The lack of a standardized Thai Language aphasia test raises difficulties not only with the assessment and treatment planning for the clinical but also with the accurate diagnosis and the reliable incidence for research on aphasiology in Thailand. This study aimed to use the Thai version of German Aachen aphasia (THAI-AAT), which is systematically adapted according to well-defined linguistic criteria and psychometric requirement, to assess the language deficit of Thai aphasic patients. The subjects participating in this study were 125 aphasia patients, 60 non-aphasic brain damaged patients and 120 normal subjects. The result revealed that the THAI-AAT is linguistically parallel in test design and fulfills the same psychometric properties as the original. The THAI-AAT obtains the goals: to differential diagnosis of aphasia distinguishing it from non-aphasic disturbance and to identify the type of aphasic syndrome.

Aphasia↗
PubMed1996

Tracking children from poverty at risk for specific language impairment: a 3-year longitudinal study.

A 3-year longitudinal study of the language performance of children from poverty was designed to address the problem of separating children with a specific language impairment (SLI) from low-scoring normal children in the borderline area on the continuum of language performance where normal ends and abnormal begins. Two approaches to definition were compared: an experimental approach (using story-retelling, rote-memory ability, and invented-morpheme learning) and a traditional approach (using standardized-test discrepancy scores). Results indicated that 6 of 34 children tracked from kindergarten through second grade appeared to be SLI at the end of the study. The best kindergarten predictor for the outcome status of these 6 children was a combination of the score on the Oral Vocabulary subtest of the TOLD-2P and the score on a combination of the experimental tasks. The best single kindergarten predictor of the academic status of the 15 children in the study who received academic remediation was story-retelling. Children's scores on the experimental and standardized tests of language performance and nonverbal intelligence were profiled over the 3 years of the study, and patterns of change in many instances reveal the lifting of the early influences of poverty.

Child↗