A study of virtual reality for improving of left unilateral spatial neglect by Head Mounted Display system.

我们研究的目的是研究连接到计算机的头戴式显示器（HMD）系统作为虚拟现实的临床应用来改善忽视症状的效果。宽视场头戴式显示器系统用于视觉显示，以产生缩小或扩展的图像。A3电荷耦合器件（CCD）相机记录一个物体或一个视图，然后将视觉数据存储到计算机中。计算机将可视数据转换成缩小或扩大的图像。最后，在HMD系统的左右镜头上显示缩小或扩展后的图像。HMD系统在实验中使用了真实图像的70%、80%、90%和100%的还原率。本研究选择了6例左半球忽视的右脑损伤患者（平均年龄67.7岁）。我们使用了一个线消去任务，这是评估半球忽视的经典测试之一。所有受试者先不带HMD，然后再带HMD进行测试。测试试验分别在视觉显示减少70% （70VR+）、80% （80VR+）、90% （90VR+）和真实图像（无视觉显示减少；VR-） 4种情况下进行。结果显示，与未使用HMD的患者（VR-）相比，使用HMD的患者在70% （70VR+）、80%（8VR+）和90VR+条件下均有改善。90VR+组与VR-组、90R+组与70VR+组存在显著性差异。这些结果表明，HMD系统可能在单侧空间忽视的神经心理康复中发挥重要作用。

The aim of our study was to investigate the effect of a head mounted display (HMD) system connected to a computer for improving neglect symptoms as a clinical application of virtual reality. The wide view HMD system was used for a visual display in order to produce a reduced or extended picture. A3 Charge-Coupled device (CCD) camera recorded an object or a view and then visual data was stored into a computer. The computer changed the visual data into a reduced or an extended picture. Finally, the reduced or extended pictures were displayed on the right and left lenses in the HMD system. The HMD system used the reduction rates of 70, 80, 90, and 100 percent of a real picture in the experiment. Six right brain-damaged patients (mean age 67.7 years) who have left hemispatial neglect were selected for this study. We used a line cancellation task that was one of the classic tests for assessing hemispatial neglect. All subjects performed the test first without and then with the HMD.The test trials were carried out under 4 conditions : 70% (70VR+), 80% (80VR+), 90% (90VR+) of reduced visual display and the real image (no reduced visual display ; VR-).The results showed that all patients improved under 70% (70VR+), 80%(8VR+), and the 90VR+ conditions with use of the HMD as compared to the condition without HMD (VR-). There were significant differences between 90VR+ condition and the VR- condition, and between 90R+ condition and the 70VR+ condition. These results suggest that the HMD system may come to have an important role in the neuropsychological rehabilitation of unilateral spatial neglect.