Locating the cortical bottleneck for slow reading in peripheral vision.
Locating the cortical bottleneck for slow reading in peripheral vision.
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DOI：
10.1167/15.11.3
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发表时间：
2015-08
影响因子：
1.8
通讯作者：
Deyue Yu;Yi Jiang;G. Legge;Sheng He
中科院分区：
文献类型：
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作者：
Deyue Yu;Yi Jiang;G. Legge;Sheng He
Yu, Legge, Park, Gage, and Chung（2010）认为慢速外周阅读的神经瓶颈位于非视网膜区域。我们利用功能磁共振成像研究了外周阅读的潜在限速神经部位，并将外周阅读与外周呈现的普通物体线条图的识别进行了对比。我们测量了在三种呈现率（2、4和8/秒）下，在中央凹视觉或周边视野（10°右下视野）中呈现的文本（三个字母的单词/非单词）和线条绘制物体的BOLD反应。视野×呈现率对文本的BOLD反应的交互作用在统计学上显著，但对线条图的交互作用不显著，这为外围文本的独特加工提供了证据。在所有五个感兴趣的区域（roi）中都获得了这种结果模式。在早期视网膜置换皮质区，BOLD信号随着中央凹文本呈现率的增加而略有增加，而对于周围文本则保持相当稳定。在枕部词反应区（OWRA）、视觉词形式区（VWFA）和物体敏感区（LO和PHA）中，文本的BOLD反应随着外周呈现率的增加而下降，而中央凹呈现率不增加。相比之下，在所有roi中，无论是中央凹还是周围呈现，对于划线物体的BOLD反应都没有速率相关的减少。只有周围呈现的文本显示出独特的速率依赖模式。虽然分化可能在视网膜定位皮层表征的早期就开始出现，但对外周呈现文本的缓慢阅读的神经瓶颈可能是外周文本处理在对象类别选择皮层中的特殊特性。
Yu, Legge, Park, Gage, and Chung (2010) suggested that the neural bottleneck for slow peripheral reading is located in nonretinotopic areas. We investigated the potential rate-limiting neural site for peripheral reading using fMRI, and contrasted peripheral reading with recognition of peripherally presented line drawings of common objects. We measured the BOLD responses to both text (three-letter words/nonwords) and line-drawing objects presented either in foveal or peripheral vision (10° lower right visual field) at three presentation rates (2, 4, and 8/second). The statistically significant interaction effect of visual field × presentation rate on the BOLD response for text but not for line drawings provides evidence for distinctive processing of peripheral text. This pattern of results was obtained in all five regions of interest (ROIs). At the early retinotopic cortical areas, the BOLD signal slightly increased with increasing presentation rate for foveal text, and remained fairly constant for peripheral text. In the Occipital Word-Responsive Area (OWRA), Visual Word Form Area (VWFA), and object sensitive areas (LO and PHA), the BOLD responses to text decreased with increasing presentation rate for peripheral but not foveal presentation. In contrast, there was no rate-dependent reduction in BOLD response for line-drawing objects in all the ROIs for either foveal or peripheral presentation. Only peripherally presented text showed a distinctive rate-dependence pattern. Although it is possible that the differentiation starts to emerge at the early retinotopic cortical representation, the neural bottleneck for slower reading of peripherally presented text may be a special property of peripheral text processing in object category selective cortex.