Objective An application system based on Java3D in brain computer interfaces ( BCI ) is designed to study the BCI system in an ideal environment, and pave the way for the development of the practical applications. Methods The processed EEG signals are converted to the real-time control commands which may drivre the virtual car to move by TCP/IP. The system design contains three steps. Firstly, we set up a virtual scene, build models and make the layout of the scene. Secondly we design a virtual car which can move forward and rotate continuously. Thirdly, we design the collision detection with the models in the scene and apply EEG analysis based on imagination activities to control the car in real time in order to test the system function. Results The experimental results show that EEG signals can continuously drive the virtual car to move in real time, and the function of collision detection is normal. Conclusions The results preliminary prove the feasibility of the application system, present a good foundation and set an example for the design of BCI application system.%目的 为在理想环境下研究脑机交互(brain computer interface,BCI)系统,并为系统的实际应用开发做铺垫,本文基于Java3D设计了脑机交互应用系统.方法 EEG信号经分析处理后转换成的实时控制命令,通过TCP/IP协议传给Java3D应用系统,实时控制虚拟小车运动.该应用系统的设计分三步:首先搭建虚拟场景,包括对场景模型的建立以及对场景的布局设计;其次设计虚拟小车的运动,实现小车前进和旋转的连续运动;最后对场景中的模型配置进行碰撞检测,用基于运动想象的EEG分析结果实时控制小车运动,检验本系统的功能.结果 EEG信号可以实时控制虚拟小车进行连续运动,且碰撞检测功能正常.结论 研究结果初步证明该应用系统的可行性,为BCI应用系统的设计提供了新颖思路并奠定了良好基础.
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