Does binding of synesthetic color to the evoking grapheme require attention?
Does binding of synesthetic color to the evoking grapheme require attention?
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DOI：
10.1016/s0010-9452(08)70348-4
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发表时间：
2006-02-01
期刊：
影响因子：
3.6
通讯作者：
Robertson, Lynn
中科院分区：
文献类型：
--
作者：
Sagiv, Noam;Heer, Jeffrey;Robertson, Lynn
与形状和颜色等特征结合相关的神经机制存在一些争议。准确的结合是否依赖于顶叶的空间注意功能，或者是否可以在没有注意输入的情况下发生？一个可能揭示这个问题的非凡现象是色彩-字母联觉，这是一种罕见的情况，字母形状会唤起颜色感知。一个流行的建议是，联觉是由不同功能区域之间的交叉激活引起的（例如，腹侧通路的形状和颜色区域之间）。在这种情况下，结合可能不需要顶叶的参与，并且可能会预先注意地发生。我们在两个能感知彩色灰度字母和数字的联觉者中测试了这一假设。我们没有发现使用视觉搜索范例进行前注意结合的证据，其中目标是联觉诱导剂。在另一个涉及颜色判断的实验中，我们表明，当数字包含在关注的空间区域内时，目标颜色和不相关数字的联觉颜色的一致性对性能的调节更大。我们认为，产生这种类型联觉的机制似乎至少遵循正常结合的一些原则，甚至联觉结合似乎也需要注意。
The neural mechanisms involved in binding features such as shape and color are a matter of some debate. Does accurate binding rely on spatial attention functions of the parietal lobe or can it occur without attentional input? One extraordinary phenomenon that may shed light on this question is that of chromatic-graphemic synesthesia, a rare condition in which letter shapes evoke color perceptions. A popular suggestion is that synesthesia results from cross-activation between different functional regions (e.g., between shape and color areas of the ventral pathway). Under such conditions binding may not require parietal involvement and could occur preattentively. We tested this hypothesis in two synesthetes who perceived grayscale letters and digits in color. We found no evidence for preattentive binding using a visual search paradigm in which the target was a synesthetic inducer. In another experiment involving color judgments, we show that the congruency of target color and the synesthetic color of irrelevant digits modulates performance more when the digits are included within the attended region of space. We propose that the mechanisms giving rise to this type of synesthesia appear to follow at least some principles of normal binding, and even synesthetic binding seems to require attention.