Department of Neurorehabilitation, Graduate School of Health Science, Kio University Nara, Japan ; Neurocognitive Rehabilitation Center, Setsunan General Hospital Osaka, Japan.
Department of Neurorehabilitation, Graduate School of Health Science, Kio University Nara, Japan.
Front Hum Neurosci. 2014 Mar 20;8:137. doi: 10.3389/fnhum.2014.00137. eCollection 2014.
Modulation of pain using visual distortion of body size (VDBS) has been the subject of various reports. However, the mechanism underlying the effect of VDBS on pain has been less often studied. In the present study, factors associated with modulation of pain threshold by VDBS were investigated. Visual feedback in the form of a magnified image of the hand was provided to 44 healthy adults to examine changes in pain. In participants with a higher pain threshold when visual feedback of a magnified image of the hand was provided, the two-point discrimination threshold decreased. In contrast, participants with a lower pain threshold with visual feedback of a magnified image of the hand experienced unpleasant emotions toward the magnified image of the hand. Interestingly, this emotional reaction was strongly associated with negative body consciousness in several subjects. These data suggested an analgesic effect of visual feedback in the form of a magnified image of the hand is only when tactile perception is vivid and the emotional reaction toward the magnified image is moderate. The results also suggested that negative body consciousness is important for the modulation of pain using VDBS.
利用身体大小视觉失真（VDBS）来调节疼痛已经有很多报道。然而，VDBS 对疼痛影响的机制研究较少。本研究旨在探讨 VDBS 调节疼痛阈值的相关因素。通过提供手部放大图像的视觉反馈，对 44 名健康成年人进行了疼痛变化的检查。在提供手部放大图像视觉反馈时疼痛阈值较高的参与者中，两点辨别阈降低。相反，在提供手部放大图像视觉反馈时疼痛阈值较低的参与者对放大的手部图像会产生不愉快的情绪。有趣的是，在几个被试中，这种情绪反应与负面身体意识强烈相关。这些数据表明，只有在触觉感知生动并且对放大图像的情绪反应适度时，手部放大图像的视觉反馈才具有镇痛作用。结果还表明，负面身体意识对于使用 VDBS 调节疼痛很重要。
