Sensory and cognitive mechanisms of change detection in the context of speech.
Sensory and cognitive mechanisms of change detection in the context of speech.
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DOI：
10.1007/s00429-007-0167-8
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发表时间：
2008-02
影响因子：
3.1
通讯作者：
Constable, R. Todd
中科院分区：
文献类型：
--
作者：
Laufer, Ilan;Negishi, Michiro;Rajeevan, Nallakandi;Lacadie, Cheryl M.;Constable, R. Todd
关键词：
本研究的目的是分离的贡献，基于记忆（认知）和适应为基础的（感官）机制的偏差检测在自然语音的背景下。20名健康的以英语为母语的右撇子参与了一项事件相关设计扫描，其中自然语音刺激，/de：/（“deh”）和/deI/（“day”）;（/te：/（“teh”）和/teI/（“tay”）作为功能磁共振成像事件相关“oddball”范式内的标准和偏离，旨在引出不匹配的负性成分。因此，“oddball”块可能涉及导致“单词优势”效应的单词偏离（“day”），或非单词偏离（“deh”或“tay”）。我们利用了一个实验协议，控制不应期类似于以前使用的异常检测时，研究的背景下，音调。结果表明，认知和感觉机制的偏差检测分别位于前和后听觉皮层，如以前发现的背景下的音调。认知效应，这是最强大的词越轨，减少了“古怪”的条件。此外，结果表明，词汇的语音刺激的状态与声学因素相互作用，施加自上而下的调制的程度，新的声音获得访问受试者的意识，通过基于记忆的过程。因此，偏离刺激越显著，越有可能从后听觉皮层施加的适应效应中释放出来。
The aim of this study was to dissociate the contributions of memory-based (cognitive) and adaptation-based (sensory) mechanisms underlying deviance detection in the context of natural speech. Twenty healthy right-handed native speakers of English participated in an event-related design scan in which natural speech stimuli, /de:/ (“deh”) and /deI/ (“day”); (/te:/ (“teh”) and /teI/ (“tay”) served as standards and deviants within functional magnetic resonance imaging event-related “oddball” paradigm designed to elicit the mismatch negativity component. Thus, “oddball” blocks could involve either a word deviant (“day”) resulting in a “word advantage” effect, or a non-word deviant (“deh” or “tay”). We utilized an experimental protocol controlling for refractoriness similar to that used previously when deviance detection was studied in the context of tones. Results showed that the cognitive and sensory mechanisms of deviance detection were located in the anterior and posterior auditory cortices, respectively, as was previously found in the context of tones. The cognitive effect, that was most robust for the word deviant, diminished in the “oddball” condition. In addition, the results indicated that the lexical status of the speech stimulus interacts with acoustic factors exerting a top-down modulation of the extent to which novel sounds gain access to the subject’s awareness through memory-based processes. Thus, the more salient the deviant stimulus is the more likely it is to be released from the effects of adaptation exerted by the posterior auditory cortex.
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影响因子：
3
作者：
Billingsley-Marshall, Rebecca L.;Clear, Trustin;Papanicolaou, Andrew C.
通讯作者：
Papanicolaou, Andrew C.
影响因子：
5.3
作者：
Gold, Brian T.;Balota, David A.;Andersen, Anders H.
通讯作者：
Andersen, Anders H.
影响因子：
3.3
作者：
FORMAN, SD;COHEN, JD;NOLL, DC
通讯作者：
NOLL, DC
影响因子：
1.3
作者：
Holmes, CJ;Hoge, R;Evans, AC
通讯作者：
Evans, AC
影响因子：
3.2
作者：
LoCasto, PC;Krebs-Noble, D;Burton, MW
通讯作者：
Burton, MW