Confusions of body senses and difficulties of sensory-motor coordination under the condition of up-down/left-right transposed or delayed feedback vision.

为了水平或垂直地变换我们的视野，我们可以使用光学系统以外的视频系统。利用前面的系统，我制作了一个既能产生延迟反馈视觉又能产生空间转置视觉的装置。一些参与者戴着头盔视频显示器，执行一些写日语或英语字母和画一些数字的任务。在实验过程中，实验者通过摄像机记录下发光笔尖的轨迹，并以每秒30次的速度数字化笔尖的位置，在延迟反馈条件下，正常参与者经常会过度跟踪底层模型。也许，他们是在视觉的指引下完成这项任务的。然而，他们在写日文汉字时并没有过度追查。这一次，他们可能会在已经获得的运动感的指导下写出日语字符。与我们的假设相反，在延迟反馈条件下，正常被试在书写任务中没有添加丰富的笔画。我们还将书写/绘画任务强加给了一名表现出单边空间忽视的患者。对于患者，我们只在视力正常的情况下进行书写/绘画任务。当我们要求他画一个双圆时，他用铅笔画得很正确，在铅笔下他可以看到自己的手迹。然而，当他用他看不见的光笔画的时候，他画得很丰富。对于画立方体的任务，他表现出更明显的困惑；我们无法识别他的痕迹是立方体。这些事实表明，在表演者看不到手的痕迹的情况下进行绘画任务可能是一种很有前途的检测某种神经心理功能障碍的方法。

In order to transpose our visual field horizontally or vertically, we can use video systems other than optical systems. Using the former system, I made a device which produce delayed feedback vision as well as spatially transposed vision. Some participants wore a head-mounted video display and performed some tasks to write Japanese or English letters and draw some figures. During the tasks, the experimenter recorded the traces of the light-emitted pen-point by a video camera, and digitalize the positions of the pen-points 30 times per second.Under the delayed feedback condition, normal participants often over-traced the underneath model. Probably, they do the task guided by vision. However, they did not over-trace when they wrote Japanese Kanji characters. This time, they might write the Japanese characters guided by the kinetic sense already acquired. Contrary to our presupposition, the normal participants did not add abundant strokes to the letters in the writing tasks under the delayed feedback condition.We also imposed the writing/drawing tasks on a patient who showed unilateral spatial neglect. To the patient, we imposed the writing/drawing tasks only under the normal vision condition. When we requested him to draw a double-circle, he perform it correctly when he did it with pencil under which he could see the trace of his hand. However, he drew abundantly when drawing with the light-pen under which he could not see it. For the task to draw a cube, he showed more prominent confusion; and we could not identify his trace to be a cube. These facts suggest that the drawing tasks under the condition that a performer cannot see the trace of his/her hand may be a promising method to detect some kinds of neuropsychological dysfunctions.