Can earlier literacy skills have a negative impact on future home literacy activities? Evidence from Japanese

We examined the cross-lagged relations between the home literacy environment and literacy skills in Japanese, and whether child's gender, parents' education and child's level of literacy performance moderate the relations. One hundred forty-two Japanese children were followed from Grades 1 to 2 and assessed on character knowledge, reading fluency and spelling. Their parents responded to a questionnaire assessing the frequency of their teaching and shared reading. Results showed that parent teaching increased and shared reading decreased from Grades 1 to 2. Cross-lagged path analysis indicated that the literacy skills in Grade 1 were negatively associated with parent teaching in Grade 2. The results further suggested that more educated parents of higher performing children, particularly boys, adjusted their involvement to their children's literacy skills, while less educated parents of lower performing children did not. These findings indicate the importance of parents' sensitivity to their child's performance. What is already known about this topic • Home literacy environment (HLE) plays an important role in children's literacy acquisition in Western and some East Asian contexts. • Children's early reading skills can have an impact on later HLE. • The direction of the relationship between HLE and children's reading skills may change from positive in Kindergarten to negative in Grade 1. What this paper adds • In line with the findings of previous studies in other languages, Japanese parents adaptively adjust their home literacy activities to their child's literacy skills. • The effect of children's literacy skills on later shared reading is stronger among boys than among girls. • More educated parents of higher performing children adjust their involvement to their child's literacy skills, while less educated parents with lower performing children do not. Implications for theory, policy or practice • We should encourage parents to be sensitive to their child's literacy skills to help them build a foundation that will boost future literacy development. • This can be particularly true of less educated parents with poorly performing children. • We should encourage educators to communicate the children's literacy achievement to their parents and also suggest the means by which HLE could be beneficial for their children's literacy development

Cognitive predictors of literacy acquisition in syllabic Hiragana and morphographic Kanji

We examined the role of different cognitive skills in word reading (accuracy and fluency) and spelling accuracy in syllabic Hiragana and morphographic Kanji. Japanese Hiragana and Kanji are strikingly contrastive orthographies: Hiragana has consistent character-sound correspondences with a limited symbol set, whereas Kanji has inconsistent character-sound correspondences with a large symbol set. One hundred sixty-nine Japanese children were assessed at the beginning of grade 1 on reading accuracy and fluency, spelling, phonological awareness, phonological memory, rapid automatized naming (RAN), orthographic knowledge, and morphological awareness, and on reading and spelling at the middle of grade 1. The results showed remarkable differences in the cognitive predictors of early reading accuracy and spelling development in Hiragana and Kanji, and somewhat lesser differences in the predictors of fluency development. Phonological awareness was a unique predictor of Hiragana reading accuracy and spelling, but its impact was relatively weak and transient. This finding is in line with those reported in consistent orthographies with contained symbol sets such as Finnish and Greek. In contrast, RAN and morphological awareness were more important predictors of Kanji than of Hiragana, and the patterns of relationships for Kanji were similar to those found in inconsistent orthographies with extensive symbol sets such as Chinese. The findings suggested that Japanese children learning two contrastive orthographic systems develop partially separate cognitive bases rather than a single basis for literacy acquisition

The role of morphological awareness in word reading skills in Japanese : A within-language cross-orthographic perspective

We examined the relationship between morphological awareness and word reading skills in syllabic Hiragana and morphographic Kanji. Participants were 127 Grade 1 Japanese-speaking children who were followed until Grade 2. The results showed that Grade 1 morphological awareness was uniquely and comparably associated with word reading skills in both Hiragana and Kanji in Grade 1 after controlling for nonverbal and verbal cognitive abilities, phonological awareness, and rapid automatized naming. The effect of Grade 1 morphological awareness on Grade 2 Kanji word recognition was slightly stronger (∆R2 = .10) than the effect on Grade 2 Hiragana reading fluency (∆R2 = .03). The findings suggest that morphological awareness plays an important role in early word reading skills across the two scripts, and with reading skill development it may become more important for mastering morphographic Kanji characters

Reading in different scripts predicts different cognitive skills : Evidence from Japanese

We examined whether developing reading skills in the two scripts of Japanese, syllabic Hiragana and morphographic Kanji, had differential effects on underlying cognitive skills. One hundred ninety-one Japanese children (97 girls, 94 boys; Mage = 100.23 months) were assessed on rapid automatized naming (RAN), vocabulary, morphological awareness, visual-spatial skills, Hiragana reading fluency, and Kanji character recognition at the end of Grade 2 and again at the end of Grade 3. Results of cross-lagged analysis showed that Hiragana reading fluency in Grade 2 predicted RAN and visual-spatial skills in Grade 3, and Kanji character recognition in Grade 2 predicted vocabulary in Grade 3, even when the same skills in Grade 2 were controlled. Taken together, these findings suggest that the nature of the script children learn can influence how developing reading skills affect their cognitive underpinnings

Application of Accelerators for the Research and Development of Scintillators

We introduce experimental systems which use accelerators to evaluate scintillation properties such as scintillation intensity, wavelength, and lifetime. A single crystal of good optical quality is often unavailable during early stages in the research and development (R&D) of new scintillator materials. Because of their beams\u27 high-excitation power and/or low-penetration depth, accelerators facilitate estimation of the properties of early samples which may only be available as powders, thin films and very small crystals. We constructed a scintillation spectrum measurement system that uses a Van de Graaff accelerator and an optical multichannel analyzer to estimate the relative scintillation intensity. In addition, we constructed a scintillation time profile measurement system that uses an electron linear accelerator and a femtosecond streak camera or a microchannel plate photomultiplier tube followed by a digital oscilloscope to determine the scintillation lifetimes. The time resolution is approximately 10 ps. The scintillation spectra or time profiles can be obtained in a significantly shorter acquisition time in comparison with that required by conventional measuring systems. The advantages of the systems described in this study can significantly promote the R&D of novel scintillator materials

Gradual loss of ACTH due to a novel mutation in LHX4: comprehensive mutation screening in Japanese patients with congenital hypopituitarism.

Mutations in transcription factors genes, which are well regulated spatially and temporally in the pituitary gland, result in congenital hypopituitarism (CH) in humans. The prevalence of CH attributable to transcription factor mutations appears to be rare and varies among populations.This study aimed to define the prevalence of CH in terms of nine CH-associated genes among Japanese patients. We enrolled 91 Japanese CH patients for DNA sequencing of POU1F1, PROP1, HESX1, LHX3, LHX4, SOX2, SOX3, OTX2, and GLI2. Additionally, gene copy numbers for POU1F1, PROP1, HESX1, LHX3, and LHX4 were examined by multiplex ligation-dependent probe amplification. The gene regulatory properties of mutant LHX4 proteins were characterized in vitro. We identified two novel heterozygous LHX4 mutations, namely c.249-1G>A, p.V75I, and one common POU1F1 mutation, p.R271W. The patient harboring the c.249-1G>A mutation exhibited isolated growth hormone deficiency at diagnosis and a gradual loss of ACTH, whereas the patient with the p.V75I mutation exhibited multiple pituitary hormone deficiency. In vitro experiments showed that both LHX4 mutations were associated with an impairment of the transactivation capacities of POU1F1 andαGSU, without any dominant-negative effects. The total mutation prevalence in Japanese CH patients was 3.3%. This study is the first to describe, a gradual loss of ACTH in a patient carrying an LHX4 mutation. Careful monitoring of hypothalamic-pituitary -adrenal function is recommended for CH patients with LHX4 mutations