Body 'ownership' defines which things belong to us and can be manipulated by signals from cutaneous or muscle receptors. Whether signals from muscle proprioceptors on their own influence perceived ownership is unknown. We used finger-joint movement to induce illusory ownership of an artificial finger without vision. We coupled the subject's index finger to an artificial finger 12 cm above it. The experimenter held the subject's other index finger and thumb on the artificial finger and passively moved them congruently or incongruently for 3 min with the index finger and the grasping index finger and thumb intact or anaesthetised. When intact, congruent movement (19 subjects) reduced perceived vertical distance between index fingers to 1.0 (0.0, 2.0) cm [median (IQR)] from 3.0 (3.0, 4.0) cm with incongruent movement (P < 0.01). Simply grasping the artificial finger reduced perceived spacing between the grasping and test index fingers from 6.0 (5.0, 9.0) cm to 3.0 (3.0, 6.0) cm (P < 0.01), a new grasp illusion. Digital anaesthesia eliminated this grasp effect, after which congruent movement still reduced the perceived spacing between the index fingers to 1.0 (0.0, 2.75) cm compared to 4.0 (3.25, 6.0) cm with incongruent movement (P < 0.001). Subjects more strongly agreed that they were holding their own finger after congruent but not incongruent movement (P < 0.01). We propose that the brain generates possible scenarios and tests them against available sensory information. This process can function without vision or motor commands, and with only one channel of somatic information.

译文

身体的 “所有权” 定义了哪些东西属于我们,并且可以通过来自皮肤或肌肉受体的信号来操纵。来自肌肉本体感受器的信号对其自身的影响是否感知所有权是未知的。我们使用手指关节运动来诱导没有视力的人造手指的虚幻所有权。我们将对象的食指与12厘米在其上方的人造手指耦合。实验者将受试者的另一食指和拇指握在人造手指上,并在食指和握持的食指和拇指完整或麻醉的情况下被动地一致或不一致地移动它们3分钟。当完整时,全等运动 (19名受试者) 将食指之间的感知垂直距离从3.0 (3.0,4.0) cm减少到1.0 (0.0,2.0) cm [中值 (IQR)],运动不一致 (P <0.01)。简单地抓取人工手指将抓取和测试食指之间的感知间距从6.0 (5.0,9.0) cm减少到3.0 (3.0,6.0) cm (P <0.01),这是一种新的抓取错觉。数字麻醉消除了这种抓握效果,此后,与具有不一致运动的4.0 (3.25,6.0) cm相比,全等运动仍将食指之间的感知间距减小到1.0 (0.0,2.75) cm (P <0.001)。受试者更强烈地同意,他们在一致但不一致的运动后握住自己的手指 (P <0.01)。我们建议大脑生成可能的场景,并根据可用的感觉信息对其进行测试。此过程可以在没有视觉或运动命令的情况下运行,并且仅具有一个躯体信息通道。

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