Left fusiform BOLD responses are inversely related to word-likeness in a one-back task.
Left fusiform BOLD responses are inversely related to word-likeness in a one-back task.
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左梭形粗体响应与单背任务中的单词相似度成反比。
DOI：
10.1016/j.neuroimage.2010.12.062
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发表时间：
2011-04-01
期刊：
影响因子：
5.7
通讯作者：
Zevin JD
中科院分区：
文献类型：
--
作者：
Wang X;Yang J;Shu H;Zevin JD
尽管它对阅读的确切功能贡献尚不清楚，但已有广泛的共识，即左侧中梭形回的活动对书面单词和类似单词的刺激高度敏感。在本研究中，我们利用中文书写系统的特殊性，从真实字符到是否包含语音和语义线索的伪字，再到表面与真实字符不同的表面相似性不同的人工刺激，对拟词进行了参数操作。在一个背靠背任务中，左侧梭形中央的大胆活动与词语的相似性呈负相关，即对真实字符的反应最小，对违反书写系统正字法限制的人工刺激的反应最大。对于这一令人惊讶的结果，一种可能的解释是，一次性任务的短期记忆需求给视觉系统带来了更大的压力，因为其他信息源无法用来帮助检测重复刺激。对于真实字符和伪字符，关于意义和发音的信息可以对表现做出贡献，而人工刺激完全依赖于视觉信息。与这一观点一致的是，功能连接性分析显示，左侧梭形中央和其他视觉区域之间存在很强的正相关关系，而通常参与文本语音和语义加工的区域与这一区域呈负相关。
Although its precise functional contribution to reading remains unclear, there is broad consensus that activity in the left mid-fusiform gyrus is highly sensitive to written words and word-like stimuli. In the current study, we take advantage of a particularity of the Chinese writing system in order to manipulate word-likeness parametrically, from real characters, to pseudo-characters that vary in whether they contain phonological and semantic cues, to artificial stimuli with varying surface similarity to real characters. In a one-back task, BOLD activity in the left mid-fusiform was inversely related to word-likeness, such that the least activity was observed in response to real characters, and the greatest to artificial stimuli that violate the orthotactic constraints of the writing system. One possible explanation for this surprising result is that the short-term memory demands of the one-back task put more pressure on the visual system when other sources of information cannot be used to aid in detecting repeated stimuli. For real characters and, to a lesser extent for pseudo-characters, information about meaning and pronunciation can contribute to performance, whereas artificial stimuli are entirely dependent on visual information. Consistent with this view, functional connectivity analyses revealed a strong positive relationship between left mid-fusiform and other visual areas, whereas areas typically involved in phonological and semantic processing for text were negatively correlated with this region.
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