Mathematics performance in left and right brain-lesioned children and adolescents

Children and adolescents with unilateral left- or right-hemisphere lesions were administered a standardized test of mathematics ability and a battery of experimental tests that examined the components of numerical and arithmetic processing. All lesioned groups showed at least marginally lower scores on the standardized test than the controls. More importantly, lesion-related deficits in performance were observed, especially for younger left-lesioned subjects (ages 7-12), on the verbal counting, digit matching, speeded addition, and written subtraction tasks; deficits among younger right-lesioned subjects were similar in nature, yet less pronounced than in the left-hemisphere group. Older left-lesioned subjects showed differences from their controls only on complex verbal counting and speeded addition. Correlations among the various measures indicated two further points. First, earlier onset of left-hemisphere lesion is associated with more serious disruption of mathematical processing. Second, these disruptions are not well assessed by a typical standardized test of mathematical performance, but are clearly in evidence with more precise, focused tasks.     

Language ability in right and left hemiplegic children

The language abilities of three right and three left hemiplegic children between 6 and 8 years of age were compared. All children presented pre- or perinatally acquired unilateral lesions confirmed by CT scan, normal hearing, comparable performance I.Q.'s, and were being educated in regular classrooms. Right hemiplegic children were found to be inferior to the left hemiplegics on tasks of speech production, vocabulary comprehension, and syntactic comprehension and formulation. Right hemiplegics also acquired single words and two-word combinations later than did left hemiplegics.     

Lexical retrieval in left and right brain lesioned children

Performance on two measures of lexical retrieval for 19 left and 13 right brain lesioned children was compared to that of control subjects matched by age, sex, race, and social class. On the Word-Finding Test, left lesioned subjects were significantly slower in response time than left controls when given semantic and visual cues and made more errors when given rhyming cues. On the Rapid Automatized Naming Test, left lesioned subjects were significantly slower than left controls in naming all semantic categories, including colors, numbers, objects, and letters. In contrast, right lesioned subjects responded as quickly as or more quickly than did right controls in all access conditions and in naming semantic categories yet tended to produce more errors than their controls, suggesting a speed-accuracy tradeoff. Children sustaining left brain lesions before 1 year of age appeared to be as impaired as those whose lesions occurred after 1 year of age. Diverse lesion sites within the left hemisphere were associated with increased lexical retrieval latencies.     

Mothers' Storybook Reading and Kindergartners' Socioemotional and Literacy Development

This study assessed storybook reading at home with reference to kindergartners’ empathy, socioemotional adjustment, language, and alphabetic skills. Beyond considering the frequency of storybook reading, measures included maternal expertise in choosing books. Findings indicated various relations between aspects of storybook reading and early development. Frequency of storybook reading was related to the child's language ability, whereas maternal expertise in choosing books was related to the child's empathy and socioemotional adjustment. These results suggest the need for further study of differential connections between shared reading and child development.     

Early literacy among Arabic-speaking kindergartners: The role of socioeconomic status,home literacy environment and maternal mediation of writing

We explored the sociocultural context of early literacy development among Arabic-speaking kindergartners in Israel, focusing on the nature of mother–child joint writing. Eighty-nine kindergartners and their mothers participated. Mothers were videotaped in their homes while helping their children write words. Early literacy was evaluated by alphabetic knowledge, concepts about print, phonological awareness, and vocabulary. Kindergartners’ early literacy was related to socioeconomic status (SES), home literacy environment (HLE) and maternal mediation level. Hierarchical regressions indicate that HLE predicted alphabetic knowledge, phonological awareness, and vocabulary beyond SES. Maternal mediation of writing predicted all children's early literacy measures except vocabulary, after controlling for SES and HLE. We discuss maternally mediated joint writing interactions as a possible context for early literacy enhancement among young Arabic-speaking children in Israel.     

Visual spatial skill: a consequence of learning to read?

Does learning to read influence one’s visual skill? In Study 1, kindergartners from Hong Kong, Korea, Israel, and Spain were tested on word reading and a task of visual spatial skill. Chinese and Korean kindergartners significantly outperformed Israeli and Spanish readers on the visual task. Moreover, in all cultures except Korea, good readers scored significantly higher on the visual task than did less good readers. In Study 2, we followed 215 Hong Kong Chinese kindergartners across 1 year, with word reading and visual skills tested twice. In this study, word reading at Time 1 by itself predicted 13% of unique variance in visual skill at Time 2. Together, these results underscore the potential importance of the process of learning to read for shaping one’s visual spatial skill development.     

Presupposition and Implication of Truth: Linguistic Deficits following Early Brain Lesions

Twenty-four children (4–17 years) with unilateral left (N = 14) or right (N = 10) hemisphere damage and 24 age-matched controls were tested on their ability to presuppose the truth of factive sentences e.g., “Max knew that he locked the door,” and to infer the truth or falsity of implicative sentences “Max remembered to lock the door.” Experimental sentence types varied according to the type of inference, the semantic features of the verb (factive vs. implicative), the presence and type of negation (lexical or syntactic), and the syntax of the complement (tensed or infinitive). Relative to age-matched controls, left lesion subjects were deficient in both their presupposition and implication performance, particularly when such inferences required the computation of negation scope. Right lesion subjects exhibited a somewhat more selective deficit; one limited to implication, but not presupposition, and one limited to lexical but not syntactic forms of negation.