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首页> 外文期刊>The European Journal of Neuroscience >Dissociations between the horizontal and dorsoventral axes in body-size perception
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Dissociations between the horizontal and dorsoventral axes in body-size perception

机译：体型知觉中横轴和背腹轴之间的分离

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摘要

Body size can vary throughout a person's lifetime, inducing plasticity of the internal body representation. Changes in horizontal width accompany those in dorsal-to-ventral thickness. To examine differences in the perception of different body axes, neural correlates of own-body-size perception in the horizontal and dorsoventral directions were compared using functional magnetic resonance imaging. Original and distorted (-30, -10, +10 and +30%) images of the neck-down region of their own body were presented to healthy female participants, who were then asked whether the images were of their own body or not based explicitly on body size. Participants perceived body images distorted by -10% as their own, whereas those distorted by +30% as belonging to others. Horizontal width images yielded slightly more subjective own-body perceptions than dorsoventral thickness images did. Subjective perception of own-body size was associated with bilateral inferior parietal activity. In contrast, other-body judgments showed pre-supplementary motor and superior parietal activity. Expansion in the dorsoventral direction was associated with the left fusiform gyrus and the right inferior parietal lobule, whereas horizontal expansions were associated with activity in the bilateral somatosensory area. These results suggest neural dissociations between the two body axes: dorsoventral images of thickness may require visual processing, whereas bodily sensations are involved in horizontal body-size perception. Somatosensory rather than visual processes can be critical for the assessment of frontal own-body appearance. Visual body thickness and somatosensory body width may be integrated to construct a whole-body representation.
机译：身体的大小可能会在一个人的一生中发生变化，从而引起内部人体模型的可塑性。水平宽度的变化伴随着背到腹的厚度变化。为了检查不同体轴知觉的差异，使用功能磁共振成像比较了水平和背腹方向上自身大小的知觉的神经相关性。向健康的女性参与者展示他们自己的颈部向下区域的原始图像和失真的图像（-30％，-10％，+ 10％和+ 30％），然后询问这些女性是否基于自己的身体明确地在体型上。参与者认为自己的身体图像失真了-10％，而属于他人的图像则失真了+ 30％。水平宽度图像比背腹厚度图像产生的主观感觉略强。对自身大小的主观感知与双侧下壁活动有关。相比之下，其他人的判断则显示出补充运动前和顶壁活动。背腹方向的扩张与左梭状回和右下顶叶相关，而水平扩张与双侧体感区的活动有关。这些结果表明两个身体轴之间的神经分离：厚度的背腹图像可能需要视觉处理，而身体感觉参与水平的体型知觉。体感而不是视觉过程对于评估额叶自身外观至关重要。视觉身体厚度和体感身体宽度可以被整合以构建全身表示。

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