Neural Basis of Lexical and Speech Processing
词汇和语音处理的神经基础
基本信息
- 批准号:7413711
- 负责人:
- 金额:$ 32.56万
- 依托单位:
- 依托单位国家:美国
- 项目类别:
- 财政年份:2004
- 资助国家:美国
- 起止时间:2004-06-01 至 2009-04-30
- 项目状态:已结题
- 来源:
- 关键词:AcousticsArchitectureAuditoryBlood flowBrainCategoriesClassConditionCuesDiscriminationEventFrequenciesFunctional Magnetic Resonance ImagingGoalsHumanJointsJudgmentLeftMagnetic Resonance ImagingMapsMeasuresNeighborhoodsNumbersPatternPerceptionPhoneticsPlayProcessPropertyResearchRoleSemanticsSeriesSignal TransductionSpecific qualifier valueSpeechSpeech DiscriminationStructureSystemTimeVoicebasedensitylanguage processinglexicallexical processingphonologyrelating to nervous systemresearch studysoundspeech processing
项目摘要
DESCRIPTION (provided by applicant): The goal of this research is to understand how the functional architecture of the speech-lexical processing system maps on to the neural systems underlying it using event-related functional magnetic resonance imaging (fMRI). Two hypotheses will be investigated, both exploring the neural systems underlying the computational properties of auditory speech and lexical processing. The first hypothesis explores whether the computational mechanisms of the two hemispheres preferentially process different properties of the speech signal. A series of experiments using both speech discrimination and phonetic categorization tasks will examine a number of acoustic-phonetic parameters underlying both consonant and vowel perception including voice-onset time and formant frequency duration in the perception of consonants, and duration and formant frequency (F l-F2) space in the perception of vowels. It is hypothesized that the acoustic properties corresponding to the phonetic categories of speech will be preferentially processed by the left hemisphere irrespective of their acoustic structure owing to the functional role that sound structure plays in language processing. In contrast, it is hypothesized that activation of the right hemisphere will be modulated by the inherent acoustic properties of the speech signal. The second hypothesis explores how the computational properties of the speech lexical processing system map on to its neural substrate. It is hypothesized that there will be increased left frontal activation under conditions of phonetic-phonological, lexical, and/or semantic competition. Phonetic competition will be investigated by exploring the extent to which acoustic-phonetic structure and the proximity of an exemplar to a contrasting, and hence, competing phonetic category influences frontal activation. Lexical competition will be investigated by exploring the influence of phonetic factors on lexical competition and phonological factors on lexical neighborhood density. Semantic competition will be investigated by exploring the effects of semantically ambiguous words compared to unambiguous words on neural activation patterns.
描述(由申请人提供):本研究的目标是使用事件相关功能磁共振成像(fMRI)了解语音词汇处理系统的功能架构如何映射到其底层的神经系统。两个假设将被调查,都探索听觉语音和词汇处理的计算特性的神经系统。第一个假设探讨了两个半球的计算机制是否优先处理语音信号的不同属性。使用语音辨别和语音分类任务的一系列实验将检查作为辅音和元音感知的基础的许多声学语音参数,包括辅音感知中的语音起始时间和共振峰频率持续时间,以及元音感知中的持续时间和共振峰频率(F1-F2)空间。据推测,语音的语音类别对应的声学特性将优先处理的左半球,而不管他们的声学结构,由于功能的作用,声音结构在语言处理中发挥。相反,假设右半球的激活将由语音信号的固有声学特性调制。第二个假设探讨了语音词汇处理系统的计算特性如何映射到其神经基质上。据推测,将有增加左额叶激活语音,词汇和/或语义竞争的条件下。语音竞争将通过探讨在何种程度上的声学语音结构和接近的一个样本的对比,因此,竞争的语音类别影响额叶激活。词汇竞争将通过探讨语音因素对词汇竞争的影响和语音因素对词汇邻域密度的影响来研究。语义竞争将通过探索语义模糊的词相比,明确的话对神经激活模式的影响。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
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Sheila E Blumstein其他文献
Sheila E Blumstein的其他文献
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{{ truncateString('Sheila E Blumstein', 18)}}的其他基金
A Pilot Therapy Program to Improve Phonetic Production in Aphasia
改善失语症语音产生的试点治疗计划
- 批准号:
8616744 - 财政年份:2013
- 资助金额:
$ 32.56万 - 项目类别:
A Pilot Therapy Program to Improve Phonetic Production in Aphasia
改善失语症语音产生的试点治疗计划
- 批准号:
8491045 - 财政年份:2013
- 资助金额:
$ 32.56万 - 项目类别:
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