Audio-visual presentation system for magnetoencephalogram measurements

我们开发了一种用于测量人体脑磁图的视听刺激呈现系统。在电子屏蔽室中测量人脑诱发磁场时，严格禁止任何来自电子刺激呈现设备的噪声源，以测量与心理任务相关的无噪声高质量磁场。我们利用基于PC机的视觉刺激演示系统开发了无噪声演示系统，该系统采用基于镜面的投影屏，可以很容易地将任何运动的视觉刺激，即运动、运动后效、表观运动，呈现在卧床的房间受试者的侧面或顶部墙壁屏幕上。此外，还开发了音频演示，其中受试者可以通过无噪声扬声器系统听到阅读跨度测试语音。此外，我们还开发了用于事件相关脑电位实验的改进版本，在这些实验中，应该避免类似的电诱导噪声，但标准较弱。在事件相关电位的研究中，我们用基于红外的光纤通信线路代替电按键系统来检测受试者的判断。与这些系统相关的软件也被开发用于工作记忆和视觉感知实验。报告中报告了使用该系统所做的实验和发表的论文。

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.