Tamar Silberg

Deficit in implicit motor sequence learning among children and adolescents with spastic cerebral palsy.

Skill learning (SL) is learning as a result of repeated exposure and practice, which encompasses independent explicit (response to instructions) and implicit (response to hidden regularities) processes. Little is known about the effects of developmental disorders, such as Cerebral Palsy (CP), on the ability to acquire new skills. We compared performance of CP and typically developing (TD) children and adolescents in completing the serial reaction time (SRT) task, which is a motor sequence learning task, and examined the impact of various factors on this performance as indicative of the ability to acquire motor skills. While both groups improved in performance, participants with CP were significantly slower than TD controls and did not learn the implicit sequence. Our results indicate that SL in children and adolescents with CP is qualitatively and quantitatively different than that of their peers. Understanding the unique aspects of SL in children and adolescents with CP might help plan appropriate and efficient interventions.

Parents and teachers reporting on a child’s emotional and behavioural problems following severe traumatic brain injury (TBI): The moderating effect of time

Abstract Background: Gathering information from parents and teachers following paediatric traumatic brain injury (TBI) has substantial clinical value for diagnostic decisions. Yet, a multi-informant approach has rarely been addressed when evaluating children at the chronic stage post-injury. In the current study, the goals were to examine (1) differences between parents’ and teachers’ reports on a child’s emotional and behavioural problems and (2) the effect of time elapsed since injury on each rater’s report. Methods: A sample of 42 parents and 42 teachers of children following severe TBI completed two standard rating scales. Receiver Operating Characteristic (ROC) curves were used to determine whether time elapsed since injury reliably distinguished children falling above and below clinical levels. Results: Emotional–behavioural scores of children following severe TBI fell within normal range, according to both teachers and parents. Significant differences were found between parents’ reports relatively close to the time of injury and 2 years post-injury. However, no such differences were observed in teachers’ ratings. Conclusions: Parents and teachers of children following severe TBI differ in their reports on a child’s emotional and behavioural problems. The present study not only underscores the importance of multiple informants, but also highlights, for the first time, the possibility that informants’ perceptions may vary across time.

Cognitive procedural learning among children and adolescents with or without spastic cerebral palsy: the differential effect of age.

INTRODUCTION Children learn to engage their surroundings skillfully, adopting implicit knowledge of complex regularities and associations. Probabilistic classification learning (PCL) is a type of cognitive procedural learning in which different cues are probabilistically associated with specific outcomes. Little is known about the effects of developmental disorders on cognitive skill acquisition. METHODS Twenty-four children and adolescents with cerebral palsy (CP) were compared to 24 typically developing (TD) youth in their ability to learn probabilistic associations. Performance was examined in relation to general cognitive abilities, level of motor impairment and age. RESULTS Improvement in PCL was observed for all participants, with no relation to IQ. An age effect was found only among TD children. CONCLUSIONS Learning curves of children with CP on a cognitive procedural learning task differ from those of TD peers and do not appear to be age sensitive.

The effect of age-at-testing on verbal memory among children following severe traumatic brain injury

Memory deficits are a common sequelae following childhood traumatic brain injury (TBI), which often have serious implications on age-related academic skills. The current study examined verbal memory performance using the Rey Auditory Verbal Learning Test (RAVLT) in a pediatric TBI sample. Verbal memory abilities as well as the effect of age at-testing on performance were examined. A sample of 67 children following severe TBI (age average = 12.3 ± 2.74) and 67 matched controls were evaluated using the RAVLT. Age effect at assessment was examined using two age groups: above and below 12 years of age during evaluation. Differences between groups were examined via the 9 RAVLT learning trials and the 7 composite scores conducted out of them. Children following TBI recalled significantly less words than controls on all RAVLT trials and had significantly lower scores on all composite scores. However, all of these scores fell within the low average range. Further analysis revealed significantly lower than average performance among the older children (above 12 years), while scores of the younger children following TBI fell within average limits. To conclude, verbal memory deficits among children following severe TBI demonstrate an age-at-testing effect with more prominent problems occurring above 12 years at the time of evaluation. Yet, age-appropriate performance among children below 12 years of age may not accurately describe memory abilities at younger ages following TBI. It is therefore recommended that clinicians address child’s age at testing and avoid using a single test as an indicator of verbal memory functioning post TBI.

Sense of autonomy and daily and scholastic functioning among children with cerebral palsy

BACKGROUND There is growing evidence that childrens sense of autonomy is an important psychological need closely linked with the development of self-esteem and motivation. Among children with physical disabilities, motor or cognitive limitations may negatively affect childs sense of autonomy (CSA) and competency. PURPOSE To examine how sense of autonomy among children with cerebral palsy (CP) directly and indirectly relates to their activity of daily living (ADL) and scholastic performance. METHODS Seventy-three children with CP and their mothers participated in this study. Childs ADL skills and scholastic performance were assessed using the Pediatric Evaluation Disability Inventory (PEDI) and the Scholastic Skills Rating Scale (SSRS), respectively. Level of impairment was assessed using the Gross Motor Function Measure-66 (GMFM-66). CSA was established via videotaped mother-child interactions. Regression analyses were conducted to examine factors predicting childs functional level (ADL and scholastic). The overall model was tested for goodness-of-fit and test of mediation. RESULTS GMFM and CSA significantly predicted childs ADL and scholastic functioning. GMFM explained 15% of the variance for CSA, 84% for PEDI, and 24% for scholastic functioning. CSA positively mediated the association between GMFM and childs ADL skills. GMFM was positively associated with CSA. CONCLUSION Motor impairment has a substantial impact on childs level of functioning. However, childs functioning is a complex construct that is also affected by her or his sense of autonomy. Therefore, sense of autonomy can serve as a potential point of intervention to improve functioning among children with CP.

Attitudes towards motherhood of women with physical versus psychiatric disabilities

BACKGROUND Women with disabilities may face social negative attitudes with regard to their being mothers. In addition, attitudes toward different disabilities form a hierarchy, with more positive attitudes being displayed toward persons with physical disabilities than toward persons with psychiatric disabilities. OBJECTIVE Current observational study examined whether the relationship between a womans type of disability (psychiatric vs. physical) and the social attitude towards her would be moderated by her being presented as a mother. METHOD University students (N = 100) filled out the Multidimensional Attitudes Scale Toward Persons With Disabilities and the Social Distance Scale, after reading one of six randomly assigned fictitious vignettes. The vignettes consisted of a woman with a physical disability/a woman with a psychiatric disability/a woman without a disability, who either was or was not a mother. RESULTS Type of disability was found to have a main effect in some attitude domains, suggesting that attitudes toward women with physical disabilities were better than attitudes towards women with psychiatric disabilities. An interaction between type of disability and motherhood was found for the interpersonal distress subscale of the attitudes scale. It was found that when women had physical disabilities, there was no change in attitude towards them regardless of whether they were presented as mothers or not; However, when the target woman had a psychiatric disability, and she was presented as a mother, negative attitudes were generated towards her. CONCLUSIONS The study demonstrates the existence of a hierarchy of stigmatization and the effect of being a mother on stigmatization.

Functional Plasticity in the Absence of Structural Change

This work presents a case of a young woman with apraxia and a severe body scheme disorder, 10 years after a childhood frontal and occipitoparietal brain injury. Despite specific limitations, she is independent in performing all activities of daily living. A battery of tests was administered to evaluate praxis and body representations. Specifically, the Hand Laterality Test was used to compare RS’s dynamic body representation to that of healthy controls (N = 14). Results demonstrated RS’s severe praxis impairment, and the Hand Laterality Test revealed deficits in accuracy and latency of motor imagery, suggesting a significant impairment in dynamic body representation. However, semantic and structural body representations were intact. These results, coupled with frequent use of verbalizations as a strategy, suggest a possible ventral compensatory mechanism (top-down processing) for dorsal stream deficits, which may explain RS’s remarkable recovery of activities of daily living. The link between praxis and dynamic body representation is discussed.