Understanding the linguistic, cognitive, and socio-cognitive predictors of differing trajectories in child language development:

维多利亚研究中的早期语言分析。大约7.5%的儿童在语言发展方面有困难，并有终身影响，患有发展性语言障碍。早期发现和提供有效的干预可以帮助减少这些困难的影响。然而，幼儿语言的不稳定性使得很难预测哪些有早期语言困难的儿童会持续存在困难，哪些会解决。流行病学研究已经确定了语言轨迹和结果的多种预测因素，但这些因素几乎不能解释差异。小规模研究发现，早期个体在语言症状学、认知和/或社会认知因素方面的差异可能预测语言轨迹。然而，由于有限的随访，样本量和限制措施，研究结果仍然模棱两可。为了严格检查语言症状学、认知和社会认知因素的早期个体差异，并预测语言轨迹，需要详细的经验数据，维多利亚早期语言研究（ELVS）是一项专注于语言的纵向社区队列研究（N=1,910），提供了独特的数据。使用ELVS数据，我将进行描述性、回归和潜在类别分析，以确定：(1)语言轨迹和持续、解决和后期出现困难的儿童比例；(2)语言、认知和社会认知因素在多大程度上预测轨迹；(3)不同的发展轨迹如何预测以后的教育和扫盲结果；(4)是否有可能在早期的语言、认知和社会认知症状学中对群集/亚群进行分类，以及这些如何预测后来的语言、教育和扫盲结果？在回答这些问题时，我的目标是提供与早期识别相关的发现，从而制定政策和实践，并为语言障碍的个体发生理论提供信息。

Analyses of the Early Language in Victoria Study.Approximately 7.5% of children have difficulties with language development with lifelong consequences and have Developmental Language Disorder. Early identification and provision of effective intervention could help to reduce the impact of these difficulties. However, volatility in young children's language makes it hard to predict which children with early language difficulties have persisting difficulties and which will resolve.Epidemiological studies have identified multiple predictors of language trajectories and outcomes, but these explain little of the variance. Small-scale studies have identified that early individual differences in linguistic symptomatology, cognitive, and/or socio-cognitive factors may predict language trajectories. However, due to limited follow-up, sample size, and restricted measures, the study findings remain equivocal.To rigorously examine early individual differences in linguistic symptomatology, cognitive, and socio-cognitive factors and predict language trajectories requires detailed empirical data, the Early Language in Victoria Study (ELVS), a longitudinal community cohort (N=1,910) focusing on language, uniquely provides this.Using the ELVS data, I will conduct descriptive, regression, and latent class analyses to identify: (1) language trajectories and the proportion of children with persisting, resolving, and late-emerging difficulties; (2) to what degree linguistic, cognitive, and socio-cognitive factors predict trajectories; (3) how differing trajectories predict later educational and literacy outcomes; (4) whether categorising clusters/subgroups in early linguistic, cognitive, and socio-cognitive symptomatology is possible and how do these predict later language, educational, and literacy outcomes?In answering these questions, I aim to deliver findings relevant to early identification, and therefore policy and practice, and inform theories of the ontogeny of language disorders.