A brain area for visual numerals.
A brain area for visual numerals.
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DOI：
10.1523/jneurosci.4558-12.2013
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发表时间：
2013-04-17
期刊：
影响因子：
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通讯作者：
Parvizi J
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文献类型：
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作者：
Shum J;Hermes D;Foster BL;Dastjerdi M;Rangarajan V;Winawer J;Miller KJ;Parvizi J
人类视觉系统中是否有一个独特的区域对数字有优先反应，就像对面孔、文字或场景一样？我们使用颅内电生理记录解决了这个问题，并观察到在高频宽带范围（高γ，65-150 Hz）内对视觉呈现的数字的反应显著高于形态相似的数字（即，字母和假字体）或语义上和语音上相似的刺激（即，数字词和非数字词）。在解剖学上，这种优先反应始终局限于颞下回和颞枕叶前。该区域位于或接近于由附近的耳道和静脉窦伪影产生的fMRI信号缺失区，这一观察结果可能解释了先前关于对数字优先反应的fMRI研究中的阴性结果。由于视觉数字是文化依赖的符号，只能通过教育学习，我们的新发现解剖定位的优先反应，这样的符号提供了一个新的例子，在人类视觉系统中获得的类别特异性反应。
Is there a distinct area within the human visual system that has a preferential response to numerals, as there is for faces, words, or scenes? We addressed this question using intracranial electrophysiological recordings and observed a significantly higher response in the high-frequency broadband range (high γ, 65–150 Hz) to visually presented numerals, compared with morphologically similar (i.e., letters and false fonts) or semantically and phonologically similar stimuli (i.e., number words and non-number words). Anatomically, this preferential response was consistently localized in the inferior temporal gyrus and anterior to the temporo-occipital incisure. This region lies within or close to the fMRI signal-dropout zone produced by the nearby auditory canal and venous sinus artifacts, an observation that may account for negative findings in previous fMRI studies of preferential response to numerals. Because visual numerals are culturally dependent symbols that are only learned through education, our novel finding of anatomically localized preferential response to such symbols provides a new example of acquired category-specific responses in the human visual system.