Graduate School of Health Science, Kio University, Kitakaturagi-gun, Nara, Japan.
Department of Rehabilitation Medicine, Keio University School of Medicine, Tokyo, Japan.
PLoS One. 2020 Mar 18;15(3):e0230603. doi: 10.1371/journal.pone.0230603. eCollection 2020.
Sense of agency refers to the feeling of being in control of one's actions. Previous research has demonstrated that sense of agency is produced through the sensorimotor system, which is involved in comparing internal predictions with sensory feedback in motor control. Therefore, sensorimotor deficits might impair agency through a sensorimotor system malfunction. The present study examined this hypothesis by investigating post-stroke patients who had suffered a subcortical stroke that damaged regions associated with sensorimotor function. To examine agency judgments with respect to motor control, we adopted a self-other attribution task and applied it to post-stroke patients. Participants traced a horizontal straight line and received visual feedback through a cursor on a monitor. The cursor movement reflected either the participants' actual movement or the movement of an "other" that had been previously recorded. Participants judged whether the cursor movement reflected their own movement (self) or an other's movement while they engaged in four cycles of the horizontal tracing movement. After each trial, participants reported their self-other judgment on a nine-point scale. Post-stroke patients completed the experiment with their paretic as well as their non-paralyzed upper limbs. Compared to healthy controls, patients made significantly more self-attributions of others' movements. Interestingly, such misattributions were observed in the patients' performance using both paretic and non-paralyzed upper limbs. These results suggest that post-stroke patients with sensorimotor deficits form misattributions that cannot be explained solely by the sensorimotor system's role in motor control. We discuss these misattributions in post-stroke patients in terms of cue integration theory.
能动性意识是指对自身行为的控制感。先前的研究表明，能动性意识是通过参与运动控制中内部预测与感觉反馈比较的感觉运动系统产生的。因此，感觉运动缺陷可能会通过感觉运动系统故障损害能动性意识。本研究通过调查患有皮质下中风的中风后患者来检验这一假说，皮质下中风损害了与感觉运动功能相关的区域。为了用运动控制来检验能动性判断，我们采用了自我-他人归因任务，并将其应用于中风后患者。参与者追踪一条水平直线，并通过显示器上的光标接收视觉反馈。光标运动反映了参与者的实际运动或先前记录的“他人”的运动。参与者在四个水平追踪运动周期中判断光标运动是反映他们自己的运动（自我）还是他人的运动。每次试验后，参与者在九点量表上报告他们的自我-他人判断。中风后患者用他们瘫痪和未瘫痪的上肢完成了实验。与健康对照组相比，患者对他人运动的自我归因明显更多。有趣的是，在患者使用瘫痪和未瘫痪上肢的表现中都观察到了这种错误归因。这些结果表明，有感觉运动缺陷的中风后患者形成的错误归因不能仅用感觉运动系统在运动控制中的作用来解释。我们根据线索整合理论讨论了中风后患者的这些错误归因。
