Spatiotemporal brain activity in mental rotation.
Spatiotemporal brain activity in mental rotation.
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心理旋转中的时空大脑活动。
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
S. Yoshizawa
中科院分区：
文献类型：
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作者：
H. Kawamichi;Y. Kikuchi;S. Ueno;S. Yoshizawa
有许多更高级的认知过程，其神经机制很难用非人类灵长类来研究。心理旋转任务是其中研究得最好的任务之一。我们通过测量执行两种心理旋转任务的被试的脑磁图，研究了不同类型心理旋转刺激下的时空脑活动。在一个实验中，视觉刺激由以不同方向呈现的手形组成，而在另一个实验中，由一组字母字符及其镜像组成，以不同方向呈现。所有刺激均出现在左侧视野。与视觉刺激处理相关的活动在枕叶外侧区、枕颞区基底区和颞下回被估计。与高级视觉加工相关的活动在我们使用的两种刺激中是不同的。对于手形实验，我们发现右侧顶下小叶在刺激呈现后200-300ms有活动。对于字母字符，在大约300ms时，在左上颞区发现活动。此外，在两个实验中都看到了与精神刺激有关的顶下小叶和运动前区域的活动。在用手进行的实验中，前运动活动表现为左半球优势。然而，在字母字符的实验中，运动前活动的偏侧性并没有表现出左半球优势。我们推测，这种差异受到受试者对视觉刺激心理旋转的熟悉程度的影响。
There are many higher-order cognitive processes whose neural mechanisms are hard to study by using nonhuman primates. The mental rotation task is one of the best studied of these. We investigated the spatiotemporal brain activity underlying mental rotation of different kinds of stimuli by measuring the magnetoencephalogram of subjects performing two kinds of mental rotation tasks. Visual stimuli in one experiment consisted of hand shapes presented at various orientations, and those in the other consisted of a set of alphabetic characters and their mirror images presented at various orientations. All stimuli were presented in the left visual field. Activity associated with visual stimulus processing was estimated in the lateral occipital lobe, basal occipitotemporal area, and inferior temporal gyrus. Activities related to higher visual processing were differed between the two kinds of stimuli we used. For the hand shape experiment, we found right inferior parietal lobule activity at 200-300 ms after the stimulus presentation. For the alphabetic characters, activity was found in the left superior temporal region at about 300 ms. Furthermore, activity related to mental stimulation in the inferior parietal lobule and premotor area were seen in the both experiments. In the experiments with hands, the premotor activity showed left-hemispheric dominance. However, in the experiments with alphabetic characters, the laterality of the premotor activity did not show left-hemispheric dominance. We inferred this difference was influenced by the subjects' familiarity with the mental rotation of visual stimuli.