Cortical response to categorical color perception in infants investigated by near-infrared spectroscopy
Cortical response to categorical color perception in infants investigated by near-infrared spectroscopy
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DOI：
10.1073/pnas.1512044113
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发表时间：
2016-03-01
影响因子：
11.1
通讯作者：
Kuriki, Ichiro
中科院分区：
文献类型：
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作者：
Yang, Jiale;Kanazawa, So;Kuriki, Ichiro
感知颜色空间是连续的;然而，我们倾向于将其划分为少数类别。目前还不清楚分类颜色知觉是否仅仅通过视觉系统的发展获得，或者是否受到语言习得的影响。为了解决这个问题，我们招募了语言发育前的婴儿（5至7个月大），通过使用近红外光谱（NIRS）来测量与类别颜色差异相关的大脑活动变化。我们向婴儿展示了两组几何图形：一组在绿色和蓝色之间变化，另一组在两种不同的绿色之间变化。我们发现，在类别间的交替，但不是在类别内的交替血流动力学反应显着增加。这些基于分类关系的血流动力学反应差异仅在双侧枕颞区观察到，而在枕区未观察到。我们证实，分类颜色的差异导致婴儿的行为差异。我们还观察到类似的血流动力学反应的分类颜色差异的成人。本研究首次证明了不同类别的颜色在语言发育前婴儿的视皮层中呈现不同的特征，这意味着颜色类别在语言习得之前可能是独立发展的。
Perceptual color space is continuous; however, we tend to divide it into only a small number of categories. It is unclear whether categorical color perception is obtained solely through the development of the visual system or whether it is affected by language acquisition. To address this issue, we recruited prelinguistic infants (5- to 7-mo-olds) to measure changes in brain activity in relation to categorical color differences by using near-infrared spectroscopy (NIRS). We presented two sets of geometric figures to infants: One set altered in color between green and blue, and the other set altered between two different shades of green. We found a significant increase in hemodynamic responses during the between-category alternations, but not during the within-category alternations. These differences in hemodynamic response based on categorical relationship were observed only in the bilateral occipitotemporal regions, and not in the occipital region. We confirmed that categorical color differences yield behavioral differences in infants. We also observed comparable hemodynamic responses to categorical color differences in adults. The present study provided the first evidence, to our knowledge, that colors of different categories are represented differently in the visual cortex of prelinguistic infants, which implies that color categories may develop independently before language acquisition.