Scrambled body differentiates body part ownership from the full body illusion
Scrambled body differentiates body part ownership from the full body illusion
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DOI：
10.1038/s41598-020-62121-9
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发表时间：
2020-03-24
影响因子：
4.6
通讯作者：
Kitazaki, Michiteru
中科院分区：
文献类型：
--
作者：
Kondo, Ryota;Tani, Yamato;Kitazaki, Michiteru
通过视觉-运动同步，可以在身体的一部分或整个身体中诱导出错觉的身体所有权。先前的一项研究表明，只有手和脚的同步运动可以引起看不见的全身错觉。身体部分所有权和全身幻觉之间的区别没有详细解释，因为没有方法将这两种幻觉分开。为了开发一种方法来做到这一点，我们扰乱或随机的手和脚的位置，并通过操纵视觉运动同步将其与正常的布局刺激进行比较。实验1中，被试从第三人称视角观察刺激，问卷结果表明，当刺激与被试的动作同步时，杂乱的身体刺激只引起身体部分所有权，而正常的布局刺激既引起身体部分所有权，又引起全身所有权。在实验2中，我们发现了类似的结果与第一人称视角的刺激问卷。在实验2或实验3中，我们没有发现任何条件之间的显著皮肤电导反应差异。这些结果表明，空间关系是必要的全身错觉，但不是身体部位的所有权。
Illusory body ownership can be induced in a body part or a full body by visual-motor synchronisation. A previous study indicated that an invisible full body illusion can be induced by the synchronous movement of only the hands and feet. The difference between body part ownership and the full body illusion has not been explained in detail because there is no method for separating these two illusions. To develop a method to do so, we scrambled or randomised the positions of the hands and feet and compared it with the normal layout stimulus by manipulating visual-motor synchronisation. In Experiment 1, participants observed the stimuli from a third-person perspective, and the questionnaire results showed that the scrambled body stimulus induced only body part ownership, while the normal layout stimulus induced both body part ownership and full body ownership when the stimuli were synchronous with participants' actions. In Experiment 2, we found similar results as with the first-person perspective stimuli in a questionnaire. We did not find significant skin conductance response difference between any conditions in either Experiment 2 or 3. These results suggest that a spatial relationship is necessary for the full body illusion, but not for body part ownership.