Automatic top-down processing explains common left occipito-temporal responses to visual words and objects.
Automatic top-down processing explains common left occipito-temporal responses to visual words and objects.
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DOI：
10.1093/cercor/bhq063
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发表时间：
2011-01
期刊：
影响因子：
--
通讯作者：
Price CJ
中科院分区：
文献类型：
--
作者：
Kherif F;Josse G;Price CJ
先前的研究表明，相对于紧密匹配的视觉刺激，左腹枕颞(LvOT)皮质中的一个区域对文字和物体的视觉形式具有高度的选择性。在这里，我们研究了为什么尽管物体的文字和图片具有截然不同的视觉形式，阅读的LvOT激活并不比图片命名的激活更高。为了比较同一LvOT区域内单词和图片的神经元反应，我们使用功能性磁共振成像适应，并指示参与者命名目标刺激，然后短暂地呈现掩蔽的初级刺激，这些刺激要么以与目标相同的刺激类型(词-词，图片-图片)呈现，要么以不同的刺激类型(图片-词，词-图片)呈现。我们发现，当启动与目标具有相同的名称/反应时，无论启动-目标关系是在刺激类型内还是在刺激类型之间，LvOT后部和前部的激活都会减少。由于后部LvOT是一个视觉形式加工区域，不同刺激类型之间不存在视觉形式相似性，因此我们的研究结果表明，图片-词语和词语-图片之间存在自上而下的自动影响。这一新的视角激发了对这一有趣区域的功能特性的进一步研究。
Previous studies have demonstrated that a region in the left ventral occipito-temporal (LvOT) cortex is highly selective to the visual forms of written words and objects relative to closely matched visual stimuli. Here, we investigated why LvOT activation is not higher for reading than picture naming even though written words and pictures of objects have grossly different visual forms. To compare neuronal responses for words and pictures within the same LvOT area, we used functional magnetic resonance imaging adaptation and instructed participants to name target stimuli that followed briefly presented masked primes that were either presented in the same stimulus type as the target (word–word, picture–picture) or a different stimulus type (picture–word, word–picture). We found that activation throughout posterior and anterior parts of LvOT was reduced when the prime had the same name/response as the target irrespective of whether the prime-target relationship was within or between stimulus type. As posterior LvOT is a visual form processing area, and there was no visual form similarity between different stimulus types, we suggest that our results indicate automatic top-down influences from pictures to words and words to pictures. This novel perspective motivates further investigation of the functional properties of this intriguing region.
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影响因子：
3.2
作者：
Devlin, Joseph T.;Jamison, Helen L.;Gonnerman, Laura M.;Matthews, Paul M.
通讯作者：
Matthews, Paul M.
影响因子：
1.8
作者：
Grill-Spector, K;Malach, R
通讯作者：
Malach, R
影响因子：
3.7
作者：
Eddy, Marianna;Schmid, Annette;Holcomb, Phillip J.
通讯作者：
Holcomb, Phillip J.
DOI：
10.1080/027249800410535
发表时间：
2000-08-01
期刊：
QUARTERLY JOURNAL OF EXPERIMENTAL PSYCHOLOGY SECTION A-HUMAN EXPERIMENTAL PSYCHOLOGY
影响因子：
--
作者：
Alario, FX;Segui, J;Ferrand, L
通讯作者：
Ferrand, L
影响因子：
5.7
作者：
Duncan KJ;Pattamadilok C;Knierim I;Devlin JT
通讯作者：
Devlin JT