Audio-visual presentation system for magnetoencephalogram measurements

我们研制了一种用于测量人体脑磁图的视听刺激呈现系统。在电子屏蔽室内测量人脑诱发磁场时，为了测量与心理任务相关的无噪声高质量磁场，严格禁止任何来自电子刺激呈现装置的噪声资源。利用基于镜像投影屏幕的基于pc的视觉刺激呈现系统，我们开发了一种无噪声的呈现系统，在这种系统中，任何移动的视觉刺激，即运动、运动后效应、视运动，都可以很容易地呈现在卧房受试者躺在床上的侧壁或顶壁屏幕上。同时开发了音频演示，通过无噪声扬声器系统，受试者可以听到阅读广度测试声音。此外，我们还针对事件相关的脑电位实验开发了改进版本，在此版本中应避免类似的电致噪声，但标准较弱。在事件相关电位研究中，我们制作了基于红外的光纤通信线路来检测被试的判断，代替了电动按钮系统。与这些系统相关的软件也被开发出来用于工作记忆和视觉感知实验。用该系统所做的实验以报告形式进行了报告，并发表了论文。

We developed an audio-visual stimulus presentation system for measuring human magnetoencephalogram. When measuring evoked magnetic field from human brain in an electronically shielded chamber, any noisy resources originated from electronic stimulus presentation devices are strictly prohibited in order to measure noise-free high-quality magnetic field associated with psychological tasks. We developed noise-free presentation system using PC-based visual stimulus presentation system using mirror-based projection screen, in which any moving visual stimulus, i.e., motion, motion-aftereffect, apparent motion, could easily be presented on side or top wall screen in the chamber subject stayed in bed. Also audio presentation was developed in which subject could hear reading span test voice via noise-free speaker system. In addition, we developed the modified version of these for event-related brain potential experiments, in which similar electrically induced noise should be avoided but with weaker criterion. In event-related potential study, we made infra-red-based fiber communication line to detect subject's judgment in stead of electric button system. Software associated with these systems was also developed for working memory and visual perception experiments. The experiments done by using these system were reported in the report form and published papers are also reported.