基于FPGA的随机字符发生器在ERP中的应用

The Application of FPGA-based Random Symbol Generator in ERP

脑电领域的众多探索一直以来都是各国科学家研究的热点。刺激源是脑电实验中不可或缺的一部分。刺激序列正确编排和稳定发生是诱发脑电信号被正确提取的先决条件。利用可编程逻辑器件作为随机字符信号发生器,使之同时具有计数和VGA显示功能,由此产生的视觉ERP刺激序列,可以作为脑区功能存在病变的病人的理想刺激源。

Brain science has always been one of the most pop fields for the scientists all over the world, electroencephalogram （EEG） recorded from the human scalp can provide important information about how the human brain processes information. The correct design and steady present of stimulus plays a very important role in the EEG experiment. Field Programmable Gate Array（FPGA） can be used to produce random signals of characters or images displayed on the Video Graphics Array（VGA）which can be used as the ideal stimulus sequence of event related potential（ERP）experiments. Particularly, it can be applied as a good stimulus for the children with mental retardation, which enables the research experiment of ERP more convenient.