COGNITIVE/LINGUISTIC FACTORS IN ACQUIRED DYSLEXIA

一项关于阅读障碍主题的研究计划被提出 发生在病前识字的成年人中，他们患有局灶性脑 损坏。这些障碍(获得性阅读障碍)经常伴随着其他 语言症状(失语症)，但有时作为孤立的缺陷出现。 获得性阅读障碍是左脑皮质常见的后遗症 因脑血管意外和创伤性头部损伤而受到侮辱。这个 个别阅读障碍患者表现出的症状被解释为 由于模型中的特定处理组件存在缺陷而导致 正常的阅读能力。有关以下功能子系统的信息 牵涉到特定症状提供了合理的处理基础 该项目的两个长期目标：大脑的本地化 阅读中涉及的认知过程和发展 针对特定症状的治疗技术。 该项目的重点是阅读系统的这一方面，即 需要“试探”(或组合)发音片段(音系学) 打印出来。有关无法执行此操作的说明，请参阅 有几种类型的患者对这三种疾病都有缺陷 据报道。这里回顾的证据是，这三个子组件 语音组装操作需要完整认知/语言 非特定于阅读的域中的能力：1)在 分析和操纵亚词汇音系所需的过程 2)语音短时(工作)记忆。三 提出了三种假设的可分性检验方法 成分和这些认知/语言过程，并调查 它们之间的处理联系。 1.解决每个假设组件的一组任务，以及 已制定相关流程，并将对其进行管理 获得性阅读障碍患者，使用传统的测试方法 对于症状之间的分离： 2.计划进行一系列“干预”研究，以调查 共现关系的因果方向 一种假想成分的变化及观察其对 患者症状：与假想成分及其疗效观察 根据患者的症状：和 3&gt；打印到声音的大规模连接式计算机模型 早先开发的转型将随着 确定亚词汇单位的最佳大小的具体目标 参与印刷品到声音的映射。

A program of research is proposed on the topic of reading disorders that occur in premorbidly-literate adults who have suffered focal brain damage. These disorders (acquired dyslexias) frequently accompany other language symptoms (aphasia), but sometimes occur as isolated deficits. Acquired dyslexias are common sequelae of left hemisphere cortical insult from cerebrovascular accident and traumatic head injury. The symptoms exhibited by individual dyslexic patients are interpreted as resulting from deficits to specific processing components within a model of normal reading. Information about the functional sub-systems that are implicated in a particular symptom provide a rational basis to approach two of the long-term goals of the project: the localization in the brain of the cognitive processes involved in reading and the development of treatment techniques for addressing specific symptoms. The project is focused on that aspect of the reading system that is required to "sound out" (or assemble) sound segments (phonology) from print. The inability to perform this operation has been described in several types of patients with deficits to each of these three have been reported. Evidence is reviewed here that these three sub-components of the phonological assembly operation require intact cognitive/linguistic abilities in domains that are not specific to reading: 1) in the processes required to analyze and manipulate sub-lexical phonological segments; and 2) in phonological short-term (working) memory. Three methods are proposed to test the separability of the three hypothesized components and these cognitive/linguistic processes, and to investigate the processing links between them. 1. A battery of tasks addressing each of the hypothesized components and related processes has been developed and will be administered to patients with acquired dyslexia, using the traditional method of testing for dissociations among symptoms: 2. A series of "intervention" studies is planned to investigate the causal direction of co-occurrence relationships by bringing about a change in one hypothesized component and observing its effect on the patient's symptoms: and hypothesized component and observing its effect on the patient's symptoms: and 3> A large-scale connectionist computer model of print-to-sound transformation, developed earlier, will be further refined with the specific goal of determining the optimal size of the sub-lexical unit that participates in print-to-sound mapping.