发展性阅读障碍的视觉空间注意加工能力

鉴于阅读起始于基础视觉加工阶段, 越来越多的研究者开始关注阅读障碍者的视觉空间注意加工能力。视觉空间注意是指个体对视觉刺激的空间位置的注意, 可通过线索提示、视觉搜索和视觉注意广度等视觉任务来考察。大量国内外研究发现, 发展性阅读障碍者在视觉空间注意任务下表现出行为和神经活动方面的异常。其中的神经机制问题不仅反映在与视觉空间注意有关的顶叶区域激活异常, 还存在于脑区间功能连接异常(如顶叶区域与字形加工区的功能连接)。未来研究还需利用横断和追踪研究探讨阅读障碍与视觉空间注意能力发展关系的内在机制, 以及探究语言特性对阅读障碍者视觉空间注意缺陷的可能调节作用。     

发展性阅读障碍的听觉时间加工缺陷

发展性阅读障碍是指个体在智力正常并且不缺乏学校教育的情况下, 仍无法获得与年龄相匹配的阅读技能的一种学习障碍, 其缺陷的本质一直是研究者争论的焦点。大量研究显示, 阅读障碍者常表现出听觉时间加工损伤。在行为层面, 阅读障碍者难以辨别快速、连续呈现刺激的顺序以及刺激本身的动态时间特征。在神经层面, 阅读障碍者诱发的失匹配负波更弱且具有异常的神经同步加工。这些损伤同时存在于对言语和非言语刺激的加工中, 表明听觉时间加工缺陷非言语加工所特有。未来的研究还需阐明以下几个问题：1)阅读障碍的听觉时间加工缺陷发生在哪些时间窗口, 随年龄增长如何变化; 2)阅读障碍听觉时间加工缺陷在神经层面的时间进程是怎样的; 3)听觉时间加工缺陷是否为阅读障碍的核心缺陷。     

发展性阅读障碍的视听时间敏感性缺陷及其脑神经机制

阅读是一个视听加工过程,阅读障碍的产生可能是过程中视听时间敏感性缺陷的结果。视听时间敏感性指个体对视觉和听觉刺激出现时间的感知能力,可通过同时性判断、时间顺序判断和视听整合考察。研究发现,阅读障碍者在这一能力上表现出行为和脑层面异常。而这些研究多是拼音文字背景,汉语文字下该领域研究相当少。未来需要丰富实验设计,扩大对汉语背景下视听时间敏感性研究,并以此开发干预手段,为阅读障碍的机制和治疗提供借鉴。     

汉语阅读障碍的语音加工及正字法加工缺陷的实验研究

本研究对汉语阅读障碍的加工缺陷进行探讨,期望有助于揭示语言加工的普遍性与特殊性,以及阅读障碍的成因,并可为后期的干预提供帮助。研究采用改编的言语认知测验对阅读水平匹配组与阅读障碍组和生理年龄匹配组进行比较后发现,阅读障碍组在语音意识和正字法加工任务上的成绩均明显差于生理年龄控制组和阅读水平匹配组;阅读障碍组在快速命名和语音记忆任务上的成绩不如生理年龄匹配组,仅达到阅读水平匹配组水平。因此,汉语发展性阅读障碍儿童存在语音意识和正字法加工缺陷,这两种缺陷可能是阅读障碍儿童面临的最主要的两大缺陷;阅读障碍儿童在快速命名和语音记忆上的不足可能是发展迟滞所致。同时,大多数的汉语阅读障碍儿童存在不止一种的认知缺陷。阅读障碍儿童在语音意识和正字法加工上存在缺陷的比例最高。     

小学汉语阅读障碍儿童的PASS认知加工特点

本研究以智力的PASS认知模型为基础,考察汉语阅读障碍儿童的PASS认知缺陷模式。研究采用DN:CAS认知评估系统,并结合统计分析对33名汉语发展性阅读障碍儿童的PASS认知加工缺陷进行了分析。结果表明,汉语发展性阅读障碍儿童存在不止一种的PASS认知加工缺陷,可能在计划、注意、同时性和继时性加工的一个或几个方面出现了困难。继时性加工缺陷是汉语阅读障碍儿童的主要特征,与英语阅读障碍的研究相一致。此外,汉语阅读障碍儿童在表达性注意、言语-空间关系和继时性加工上的成绩差于生理年龄匹配组,仅达到阅读水平匹配组水平,这些的不足可能是由于发展迟滞所致。     

发展性阅读障碍的视觉注意广度技能

发展性阅读障碍在许多任务中都出现同时性加工多个视觉刺激的困难, 即视觉注意广度缺陷.本文分别综述了国内外探查阅读障碍视觉注意广度的研究.目前, 相关研究结果仍存争议, 这可能与背景语言的正字法深度以及被试年龄发展差异有关.未来研究还需利用干预,跨语言比较等方法进一步探讨阅读障碍与视觉注意广度之间的关系, 并结合脑电,脑成像技术探究汉语阅读障碍视觉注意广度的内在神经机制.     

动作视频游戏对发展性阅读障碍者阅读技能的影响及其内在机制

发展性阅读障碍是一种在获得阅读技能方面的特殊困难, 这种障碍会严重影响个体的发展, 如何帮助发展性阅读障碍者改善其阅读技能是近年来研究的焦点。传统的干预方法主要针对发展性阅读障碍者的语音缺陷, 这类方法存在一些问题, 如费时费力、给阅读障碍者带来阅读压力等。近年来, 大部分研究表明通过趣味性的动作视频游戏训练可以显著地提高发展性阅读障碍者的阅读技能, 但是其背后的机制尚不明确。基于大细胞通路缺陷理论框架, 从视觉空间注意、注意跨通道转换、视觉运动加工等方面来梳理动作视频游戏与阅读之间的关系, 揭示了动作视频游戏训练对阅读效率影响的可能内在机制。未来的研究可以在大细胞通路缺陷理论的框架下, 深入分析动作视频游戏改善阅读的神经机制, 并尝试开发更适合发展性阅读障碍者的干预程序。     

汉语发展性阅读障碍儿童视觉同时性加工技能子成分的发展及其与阅读的关系

通过分别以高频汉字(实验1)和图形非言语材料(实验2)为刺激的两个联合视觉注意任务, 并采用基于Budensen视觉注意理论的参数估计方法, 系统地探查小学三~六年级汉语发展性阅读障碍儿童的视觉同时性加工技能缺陷的内在机制。以43名汉语发展性阅读障碍儿童和46名生理年龄匹配典型发展儿童为被试, 每类被试均被分为小学中年级组(三、四年级)和高年级组(五、六年级)。两个实验均发现不同年级组的阅读障碍儿童在知觉加工速度参数上显著小于控制组儿童。在空间注意分布权重参数上, 实验1的结果显示, 不同于控制组儿童向左侧化发展的注意分布模式, 两个年级组的阅读障碍儿童均表现为无偏的注意分布; 而实验2未发现显著组别差异。且这两种同时性加工子技能分别与不同水平的汉语阅读技能密切相关。结果表明, 汉语阅读障碍儿童在同时加工多个视觉刺激时存在持续的知觉加工速度缓慢的问题, 在同时加工言语类刺激时还表现出异常的空间注意分布模式。本研究有助于从基础认知层面揭示汉语发展性阅读障碍儿童的缺陷机理, 为进一步设计相关的提高阅读效率的干预方案提供理论依据。     

4～6年级小学生发展性阅读障碍的异质性研究

通过比较阅读障碍儿童和正常儿童在语音意识、语素意识、语音通达(语音判断)和语义通达(语义相关判断)等任务中的表现,考察阅读障碍内部的异质性以及汉语阅读障碍儿童缺陷的主要类型。结果表明,影响儿童阅读的因素包括语音、语素和词典通达等。阅读障碍儿童内部存在一定的异质性。而从汉语的本身特点和语素与各测验之间的关系来看,汉语的语素缺陷可能成为阅读困难的重要原因之一。     

发展性阅读障碍的视觉拥挤效应

发展性阅读障碍的核心缺陷一直是研究者关注的焦点。近年来,国内外大量研究发现视觉加工缺陷可能是导致阅读障碍的一个重要原因,其中视觉拥挤效应与阅读障碍密切相关。本文将回顾视觉拥挤效应的概念及其理论基础、拼音文字和汉语阅读障碍者视觉拥挤效应的相关研究,提出汉语阅读障碍视觉拥挤效应研究的未来发展方向,以便更好地了解汉语阅读障碍与视觉拥挤效应之间的关系。     

On the prevalence of magnocellular deficits in the visual system of non-dyslexic individuals

Numerous studies have found visual deficits associated with dyslexia. This has made it important to understand how these deficits may be related to reading difficulties. A widely held theory is that dyslexia is the result of a deficit in the magnocellular part of the visual system (earlier called the transient system). In support for this theory, the prevalence of magnocellular deficits has been reported to be high among dyslexic readers and very low among non-dyslexic ones. This creates the impression that in the population as a whole dyslexic individuals have magnocellular deficits and non-dyslexic individuals do not. However, we show that because the prevalence of dyslexia itself is low this need not be the case. On the basis of previously published data we have estimated the number of non-dyslexic and dyslexic individuals with magnocellular deficits. Our estimates indicate that there should be a large number of non-dyslexic individuals with magnocellular deficits. Paradoxically more individuals without dyslexia have magnocellular deficits than individuals with dyslexia. This poses a challenge to the view that dyslexia is the result of a magnocellular deficit.     

Unilateral implicit motor learning deficit in developmental dyslexia

It has been suggested that developmental dyslexia involves various literacy, sensory, motor skill, and processing speed deficits. Some recent studies have shown that individuals with developmental dyslexia exhibit implicit motor learning deficits, which may be related to cerebellar functioning. However, previous studies on implicit motor learning in developmental dyslexics have produced conflicting results. Findings from cerebellar lesion patients have shown that patients' implicit motor learning performance varied when different hands were used to complete tasks. This suggests that dyslexia may have different effects on implicit motor learning between the two hands if cerebellar dysfunction is involved. To specify this question, we used a one-handed version of a serial reaction time task to compare the performance of 27 Chinese children with developmental dyslexics with another 27 age-matched children without reading difficulties. All the subjects were students from two primary schools, Grades 4 to 6. The results showed that children with developmental dyslexic responded more slowly than nondyslexic children, and exhibited no implicit motor learning in the condition of left-hand response. In contrast, there was no significant difference in reaction time between two groups of children when they used the right hand to respond. This finding indicates that children with developmental dyslexia exhibited normal motor skill and implicit motor learning ability provided the right hand was used. Taken together, these results suggested that Chinese children with developmental dyslexia exhibit unilateral deficits in motor skill and implicit motor learning in the left hand. Our findings lend partial support to the cerebellar deficit theory of developmental dyslexia.     

间距和语义对阅读障碍儿童拥挤效应的影响

以14名阅读障碍儿童以及与其年龄和阅读水平相匹配的儿童为实验对象，考察了间距和语义对阅读障碍儿童拥挤效应的影响。结果发现阅读障碍儿童受拥挤效应的影响显著大于正常儿童，表明阅读障碍存在视觉加工缺陷；间距和语义均影响阅读障碍儿童的拥挤效应，表明影响阅读障碍儿童拥挤效应的因素既有刺激的低水平视觉特征，也有高水平语言信息；间距与阅读障碍儿童拥挤效应的关系呈U型。     

基于PASS模型的汉语阅读障碍认知加工特点的实验研究

研究以智力的PASS认知模型为基础,考察了3-5年级阅读障碍组和正常对照组的PASS认知加工特点,探究汉语阅读障碍儿童的PASS认知缺陷模式,为后期的干预提供理论上的支持和帮助。结果发现,PASS四个认知加工均存在明显的年级差异,低年级儿童的PASS认知加工能力明显不如中高年级儿童。汉语阅读障碍儿童在DN: CAS 12项分任务上的成绩均低于正常对照组儿童。同时,大多数汉语阅读障碍儿童存在不止一种的PASS认知加工缺陷,即汉语发展性阅读障碍内部是一个异质群体;阅读障碍儿童在继时性加工上存在的问题最为严重,存在缺陷的人数也最多。     

The cognitive profile and multiple-deficit hypothesis in Chinese developmental dyslexia

The present study was conducted to examine the cognitive profile and multiple-deficit hypothesis in Chinese developmental dyslexia. Thirty Chinese dyslexic children in Hong Kong were compared with 30 average readers of the same chronological age (CA controls) and 30 average readers of the same reading level (RL controls) in a number of rapid naming, visual, phonological, and orthographic tasks. Chinese dyslexic children performed significantly worse than the CA controls but similarly to the RL controls on most of the cognitive tasks. The rapid naming deficit was found to be the most dominant type of cognitive deficit in Chinese dyslexic children. Over half of the dyslexic children exhibited deficits in 3 or more cognitive areas, and there was a significant association between the number of cognitive deficits and the degree of reading and spelling impairment. The present findings support the multiple-deficit hypothesis in Chinese developmental dyslexia.     

Dyslexia,authorial identity,and approaches to learning and writing: A mixed methods study

Background. Dyslexia may lead to difficulties with academic writing as well as reading. The authorial identity approach aims to help students improve their academic writing and avoid unintentional plagiarism, and could help to understand dyslexic students’ approaches to writing. Aims. (1) To compare dyslexic and non‐dyslexic students’ authorial identity and approaches to learning and writing; (2) to compare correlations between approaches to writing and approaches to learning among dyslexic and non‐dyslexic students; (3) to explore dyslexic students’ understandings of authorship and beliefs about dyslexia, writing and plagiarism. Sample. Dyslexic (n= 31) and non‐dyslexic (n= 31) university students. Method. Questionnaire measures of self‐rated confidence in writing, understanding of authorship, knowledge to avoid plagiarism, and top‐down, bottom‐up and pragmatic approaches to writing (Student Authorship Questionnaire; SAQ), and deep, surface and strategic approaches to learning (Approaches and Study Skills Inventory for Students; ASSIST), plus qualitative interviews with dyslexic students with high and low SAQ scores. Results. Dyslexic students scored lower for confidence in writing, understanding authorship, and strategic approaches to learning, and higher for surface approaches to learning. Correlations among SAQ and ASSIST scores were larger and more frequently significant among non‐dyslexic students. Self‐rated knowledge to avoid plagiarism was associated with a top‐down approach to writing among dyslexic students and with a bottom‐up approach to writing among non‐dyslexic students. All the dyslexic students interviewed described how dyslexia made writing more difficult and reduced their confidence in academic writing, but they had varying views about whether dyslexia increased the risk of plagiarism. Conclusions. Dyslexic students have less strong authorial identities, and less congruent approaches to learning and writing. Knowledge to avoid plagiarism may be more salient for dyslexic students, who may benefit from specific interventions to increase confidence in writing and understanding of authorship. Further research could investigate how dyslexic students develop approaches to academic writing, and how that could be affected by perceived knowledge to avoid plagiarism.     

阅读障碍检测的“差异模型”与“成分模型”比较分析

阅读障碍检测的“差异模型”因其操作性强的特点备受研究者喜爱且已成为该领域研究中广为采用的检测模型,然而研究表明“差异模型”在理论与实践方面存在诸多弊端;鉴于此,一些研究者提出了基于阅读成分理论、以干预为导向、科学合理、简便易施的“成分模型”,从而避免了单一采用“差异模型”进行阅读障碍检测。研究表明“成分模型”在汉语阅读障碍检测和亚类型鉴定中同样具有可行性和有效性,因此尝试采用“成分模型”实施阅读障碍检测可以避免汉语阅读障碍检测方面存在的混杂现象,进而促使我国阅读障碍检测及亚类型鉴定朝向更加科学化、规范化方向迈进     

书写对阅读的影响——来自传统书写与电脑打字的证据

书写和阅读是在文字的基础上发展起来的, 二者存在共享的神经网络。书写能影响阅读, 阅读不仅依靠视觉加工, 还依赖书写运动表征。不同书写方式对阅读的影响不同, 传统书写对阅读有促进作用, 电脑打字对阅读产生了一定的消极影响。对汉字来说, 传统书写能加强汉字的正字法表征, 促进汉字阅读; 电脑打字对汉字阅读的影响尚无一致结论。未来研究可以考察传统书写与电脑打字神经机制的差异, 以及电脑打字对汉字认知加工的影响及神经机制。     

Copying skills in relation to word reading and writing in Chinese children with and without dyslexia

Because Chinese character learning typically relies heavily on rote character copying, we tested independent copying skill in third- and fourth-grade Chinese children with and without dyslexia. In total, 21 Chinese third and fourth graders with dyslexia and 33 without dyslexia (matched on age, nonverbal IQ, and mother’s education level) were given tasks of copying unfamiliar print in Vietnamese, Korean, and Hebrew as well as tests of word reading and writing, morphological awareness, rapid automatized naming (RAN), and orthographic processing. All three copying tasks distinguished dyslexic children from nondyslexic children with moderate effect sizes (.67-.80). Zero-order correlations of the three copying tasks with dictation and reading ranged from .37 to .58. With age, Raven’s, group status, RAN, morphological awareness, and orthographic measures statistically controlled, the copying tasks uniquely explained 6% and 3% variance in word reading and dictation, respectively. Results suggest that copying skill itself may be useful in understanding the development and impairment of literacy skills in Chinese.