Zeller Daniel, Hullin Marcus
Dept. of Neurology, University of Würzburg, 97080 Würzburg, Germany.
Dept. of Neurology, University of Würzburg, 97080 Würzburg, Germany.
Conscious Cogn. 2018 Mar;59:32-39. doi: 10.1016/j.concog.2018.01.006. Epub 2018 Feb 6.
A right-hemispheric specificity has been suggested both for spatial attention and for the feeling of body-ownership. Here, we assessed lateralization of spatial attention (Milner landmark task), rubber hand illusion (RHI), and their relationship in a group of 59 healthy elderly subjects. The occurrence of the RHI was assessed by objective (proprioceptive drift) and subjective (questionnaire) measures. Spatial attention was asymmetrical, with a slight, neglect-like overestimation of the right segment of mid-bisected lines. As to the RHI, the proprioceptive drift towards the plastic hand was significantly larger following synchronous compared to asynchronous stroking, but comparable between both sides. Subjective responses indicated an experience of the RHI during synchronous stimulation, without lateralization. On the left hand, however, the proprioceptive drift correlated significantly with the rightward bias of spatial attention. Thus, reduced attention towards sensory signals from one's own limb might facilitate the process of embodiment of an artificial hand into one's body-representation.
空间注意力和身体所有权感都被认为存在右半球特异性。在此，我们评估了一组59名健康老年受试者的空间注意力（米尔纳地标任务）、橡皮手错觉（RHI）的偏侧化及其关系。通过客观（本体感觉漂移）和主观（问卷调查）测量来评估RHI的发生情况。空间注意力是不对称的，对半分线右侧部分存在轻微的、类似忽视的高估。至于RHI，与异步抚摸相比，同步抚摸后向塑料手的本体感觉漂移明显更大，但两侧相当。主观反应表明在同步刺激期间有RHI体验，无偏侧化。然而，在左手上，本体感觉漂移与空间注意力的向右偏差显著相关。因此，减少对自身肢体感觉信号的注意力可能有助于将人造手融入身体表征的过程。
