NEURAL INDICES OF PHONOLOGICAL DEFICITS IN POOR READERS

这是一个公认的事实，穷人的读者做得明显更差 在语音意识的任务上， 听觉音位辨别、词汇通达和言语短时 记忆 越来越多的人一致认为，这些困难可能会 从语言感知的单一缺陷， 语言的习得、表征和加工。 尽管有这些 行为研究的重大进展， 受损的阅读过程仍不确定。 的总目标 本研究旨在探讨言语知觉的本质和起源 阅读障碍的缺陷，使用行为和神经， 生理（头皮记录的事件相关电位或代谢 成像测量）方法。 为此，两组（每组n=20） 好的和差的读者，7-9岁，将比较他们的 对各种语言和非语言刺激的感知 在视觉上和视觉上。 更具体地说，我们建议研究 语音操作的影响（如语音相似度） 识别率、辨别率、词汇表达率 在音节、单个单词和单词的背景下的访问和回忆 嵌入在句子中。 神经激活模式对应于 行为差异将被描述。 总之，这里的目标 是通过以下方式优化现有的巨大资源： 行为和神经生理学测试设施来追踪这一点 两组阅读能力的差异 大脑的结构和激活模式。这一努力将 允许学习新的调查技术，以及 扩大一个人的临床研究技能的研究领域，包括 其他沟通障碍。

It is a well established fact that poor readers do significantly worse than their normal reading peers on tasks of phonological awareness, auditory phoneme discrimination, lexical access and verbal short-term memory. There is a growing consensus that these difficulties might stem from a unitary deficit in speech perception that impacts on the acquisition, representation and processing of language. Despite these major advances in behavioral research, the neural correlates of the impaired reading process remain undetermined. The general objective of this study is to investigate the nature and origin of speech perception deficits in reading disability using both behavioral and neuro- physiological (scalp-recorded event-related potentials or metabolic imaging measures) methods. To this end, two groups (n=20 per group) of good and poor readers, 7-9 years of age, will be compared on their perception of a variety of speech and nonspeech stimuli presented auditorily and visually. More specifically, we propose to examine the effects of phonetic manipulations (like degree of phonetic similarity) and rate of presentation on identification, discrimination, lexical access and recall in the context of syllables, single words and words embedded in sentences. Neural activation patterns corresponding to behavioral differences will be delineated. In summary, the goal here is to optimize on the tremendous resources available by way of behavioral and neurophysiological testing facilities to trace this difference in reading ability between the two groups to specific structures and patterns of activation in the brains. This endeavour will allow for the learning of new investigative techniques, as well as, the expansion of one's clinical research skills areas of study to include other communication disorders.