The disownership of body parts, that most frequently occurs on the left side of the body, contralateral to right-hemispheric lesions, is an infrequent disorder, as usually assessed by interviews asking for dichotomic "yes/no" responses. This observational study in right-brain-damaged stroke patients investigated the efficacy of a continuous Visual Analog Scale (VAS) to detect body disownership after right brain damage, compared to dichotomic questions. Thirty-two right-handed right-brain-damaged stroke patients were given a Standardized Interview (SI), asking "Whose hand/arm/leg is this?", followed by a VAS (asking patients to mark on a vertical line their agreement with the statement that a body part belonged to them). The neural correlates of this disorder and measures of extra-personal and personal spatial neglect were also assessed. Control data were recorded from 18 neurologically unimpaired right-handed participants. During the interview, no patient showed disownership of body parts. Conversely, on the VAS eight out of 32 (25%) patients' scores, but none of the controls' scores, indicated a judgement of disownership for left body parts, with a left-right difference larger than that of control participants. VAS-detected disownership was not systematically associated with extra-personal and personal unilateral spatial neglect. Lesion sites associated with disownership of left body parts included the caudate nucleus and the anterior part of the internal capsule. To conclude, the VAS task, compared to the interview, is a novel tool to detect disownership of left body parts in right brain-damaged patients. A revised classification of body-ownership disorders is proposed. The present variant, assessed and detected by the VAS task, is termed Covert disownership and distinguished from the Overt disownership assessed by a SI.

中文翻译：

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视觉比例评估显示的身体部位不所有权。一项观察性研究。

身体部位的缺失通常发生在身体的左侧，与右半球病变相对，这是一种罕见的疾病，通常是通过面试要求二项式“是/否”的访谈来评估的。这项针对右脑受损中风患者的观察性研究调查了连续视觉模拟量表（VAS）与右耳两眼问题相比，检测右脑损伤后身体无意识的功效。对32位右手右脑受损的中风患者进行了标准化访谈（SI），询问“这是谁的手/手臂/腿？”，然后是VAS（要求患者在垂直线上标记他们的同意并声明身体部位属于他们）。还评估了该疾病的神经相关性以及对人格外和个人空间疏忽的测量。记录了来自18位神经功能正常的右撇子参与者的对照数据。在访谈中，没有患者表现出身体部位缺失。相反，在VAS上，有32分（25％）的患者评分中有8分（但无对照组得分）表明对左半身的无意识判断，其左右差异大于对照组参与者。VAS检测到的所有权归属与个人外和个人单方面的空间疏忽没有系统地关联。与左身体部分不相关的病变部位包括尾状核和内囊的前部。总之，与面试相比，VAS任务 是检测右脑受损患者左身体部位缺失的新颖工具。提出了修订的身体所有权疾病分类。由VAS任务评估和检测的当前变体称为隐蔽所有权，与SI评估的显性所有权不同。