Functional mapping of the human colour centre with echo-planar magnetic resonance imaging
Functional mapping of the human colour centre with echo-planar magnetic resonance imaging
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DOI：
10.1098/rspb.1995.0121
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发表时间：
1995-07
期刊：
影响因子：
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通讯作者：
K. Sakai;E. Watanabe;Y. Onodera;I. Uchida;Hideki Kato;E. Yamamoto;H. Koizumi;Y. Miyashita
中科院分区：
文献类型：
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作者：
K. Sakai;E. Watanabe;Y. Onodera;I. Uchida;Hideki Kato;E. Yamamoto;H. Koizumi;Y. Miyashita
脑性色盲的临床研究表明，人类梭状回中存在一个颜色中心。通过使用功能磁共振成像，我们研究了梭状回是否显示与颜色感知相关的活动。我们测试了三种刺激条件，其中受试者保持注视：（i）六个彩色圆圈的圆形阵列;（ii）与（i）相同，除了每个圆圈与其颜色对应物是等亮度的灰色;以及（iii）与（i）相同，加上每1秒顺时针移动圆圈到相邻位置。在刺激终止后，受试者在（i）中感知到具有互补颜色的圆圈的后像，但在（iii）中没有。在条件（i）中，我们发现梭状回后部的局灶性信号增加。在条件（ii）中，在刺激期间在同一位点的激活弱于（i）。在条件（iii）中，刺激终止后的信号强度弱于条件（i）中的信号强度。这里观察到的梭状回激活的颜色效应和后效应表明其在人类颜色感知中的关键作用。
Clinical studies of cerebral achromatopsia have suggested a colour centre in the human fusiform gyrus. By using functional magnetic resonance imaging, we examined whether the fusiform gyrus shows activity correlated with the perception of colour. We tested three stimulus conditions in which the subject maintained fixation: (i) a circular array of six coloured circles; (ii) the same as (i) except that each circle is equiluminant grey with its colour counterpart; and (iii) the same as (i) plus a clockwise shift of circles to neighbouring positions every 1 s. After termination of the stimulus, the subject perceived an after-image of circles with complementary colours in (i), but not in (iii). In condition (i), we found a focal signal increase in the posterior part of the fusiform gyrus. In condition (ii), the activation in the same locus during the stimulation period was weaker than that in (i). In condition (iii), the signal intensity after termination of the stimulus was weaker than that in (i). The colour effect and after-effect on activation of the fusiform gyrus observed here suggest its critical role in human colour perception.